Circuit/System Testing. P0087. If DTC P0090, P0168 or P0191 is also set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Ignition ON for 90 seconds, verify the scan tool FRP Regulator Command parameter is less than 20 percent. If greater than the specified range, replace the ECM.May 9, 2019 · The problem is with the amperage in the fuel pressure regulator control circuit out of range.without a TECH2 it is hard to diagnose.The problem will be either wiring or connector to the FPR,engine control module problem or FPR problem.The FPR is part of the high pressure injection pump. Code: P0090. Modules: ECM.May 12, 2012 · There were other codes for the glow plug circuits, but I only concentrated on the main code (U0106 -lost communication with glow plug control module). I used my Snap On Solus Pro scanner and was able to check the code and operation of the control module. There was no response from the controller.Chevy / GMC Duramax 07.5-10 LMM Forums. 07.5-10 LMM Duramax Powertrain 2008 LMM P0090 and P0088 ... Only problem now is that I am getting a p0090p fuel pressure regulator control circuit code. I tried pulling the plug just to see if I noticed anything different and I ended up with p0090 and the high fuel rail pressure code which I think was ...Chevy / GMC Duramax 07.5-10 LMM Forums. 07.5-10 LMM Duramax Powertrain. Recurring P0090. Jump to Latest Follow 1K views 1 ...P0090 Code: Fuel Pressure Regulator Control Circuit Open In The Garage with, Replace fit for OE#: 0928400653 Fits ENGINE CODE LLY Chevy SILVERADO. Home; ... The GM 98006101 Fuel Rail Pressure Sensor is a direct replacement for the OE component in your GM Duramax Features: OE . P0090 Fuel Pressure Regulator Cheapest Prices. P0090 Code: Fuel ...Duramax First Generation: 2001-2004 (LB7) p0090 and u1800 codes. 18071 Views 21 Replies 9 Participants Last post by aubfire64, Dec 26, 2006 Jump to Latest A. aubfire64 Discussion starter · Dec 9, 2006. Add to quote; Share Only show this user. truck started this a.m. on extended crank, ran four a few hours, shut off and now it wont start again. ...I had the code read at Auto Zone. They said it had to do with fuel pressure control/performance. The code #P0089 says the fuel pressure solenoid control circuit voltage is implausible. Probable causes: Open or short circuit condition. Faulty fuel pressure solenoid. EMC fault. It seems to happen every time I get fuel.P0088 Stuck Fuel Pressure Regulator. Hi guys, Im still Duramaxless but find myself always working on other peoples for side work. Right now Im dealing with a 2007 Classic LBZ 216,000. Throws P0088 high fuel pressure and some glow plug codes which I think is unrelated. Fuel pressure spikes to about 200Mpa when started and then drops around 89MPa.P0090 code after egr delete P0090 fuel pressure control code regulator circuit pump high solenoid open system troublecodes gdi delphi injection upgrades direct premium trouble P0090 p0089 tr. ... P0090 duramax limp gmc 2010 chevy equinox 2.4l. it's surging at idle and setting codes exhaust 2017 2018 2019 chevy colorado p0090 p00c8 check engine.Jul 10, 2020 · 06 LBZ codes P0090, P0080, P0168. I have a 2006 LBZ with 220,000 miles, I have the EFI Live with DSP 5, installed new injectors last year, blew an exhaust coolant line, the 4" incher that you have to pull evertything so when I did I pulled the Y bridge, EGR, cooler and totally cleaned everything inside and out.I'm looking for a little more clarity for this P0090 code that keeps coming back. Intermittenly my truck won't start. (seems to be in the morning when it's the coldest part of the day... about 34 degrees) It will throw out the P0090 code and crank but no start. ... 6.6L Duramax, Allison & NP263XHD New injectors @ 145,000 (June 2011) and 211,000 ...Duramax Second Generation: 2004.5-2005 (LLY) P0090 code. Jump to Latest Follow 1K views 1 ...Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. 1 (855) 347-2779 · [email protected]. Read FAQ. GET A QUOTE. P0091 code definition Fuel Pressure Regulator 1 Control Circuit Low What the P0091 code means P0091 means that the Powertrain Control Module …P0088 code. Ok guys I came out to my truck not turning over one day, checked fuses and found the ECM 1 fuse had popped. Replaced the fuse and now I have been dealing with P0088 (high fuel rail pressure). At idle the truck stays around 13500. I've changed the fuel pressure sensor 3 times and I've also changed out the fuel pressure regulator 3 times.Allison Transmission P0700 Code Help. So this has happened to me a couple of times now. I go to start my truck with the command start and it starts for a minute then shuts down. It pops up the code P0700. Internal codes are Shift Solenoid codes. This only happens when its really cold out.Mar 9, 2021 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====nonda Auto DIY Center is the biggest ...I have a 2003 Chevy 2500HD 6.6 L Duramax (LB7) Diesel. I am getting P0404 code and the check engine light comes on. ... i have an 02 chevy 2500hd with the duramax. it quite running. it has the following codes P0090- fuel pressure reg. P0100- mass air flow out of range P0700- trans control sys. fault and these last i ha ...Dec 26, 2022 · P0090 - Fuel Pressure Regulator 1 Control Circuit. DTC P0090. The ECM detects the commanded state of the driver and the actual state of the control circuit do not match for greater than 1 s. The ECM detects an open or high resistance on one of the fuel pressure regulator 1 circuits for greater than 1 s. Please find attached the P0090 diagnostic ...Detects delta temp. due to block heater effect or faulty in-range fuel temp.sensor. Fuel temp delta = (Start-up fuel temperature - Start-up coolant temperature) If -9.75degC> Fuel temp delta > 9.75degC uneffected by block heater. None of the following codes are set: P0112, P0113, P0182, P0183, P0500, P2610.Chevy / GMC Duramax 01-04.5 LB7 Forums. 01-04.5 LB7 Duramax Powertrain. P0193-Low fuel pressure, FPR below DFRP. Jump to Latest Follow 8K views ... It started up but the idle was lopey with P0193 code. I found a broken wire at the FPS, fixed it but after 15 minutes of driving, it sets the code again.P2564 Code. Definition: Turbocharger boost control position sensor ciruit low voltage. Explantation: The ECM detected a low voltage from the Turbocharger Boost Control Position Sensor. Probable Cause: 1-Open or short ciruit condtion.Got these codes on the way home from dinner. Was booting it by my buddy and the SES light came on. ... Former truck was a 03 Chevy 2500HD w/ Duramax. ... sounds like it runs slighty better than before but still like crap!!!! getting p0088 p0089 and p0090 now. help! 2002 Chevrolet Silverado 2500HD, 6.6 LB7 duramax. Save Share. Like.60. Rancho Cucamonga. Jun 10, 2014. #1. Hey all, I got a buddy with an 04.5lly having a no start with this code. Truck runs a 50hp tow tune and is basically stock otherwise. He said it started having a high and low idle. then he shut it off. It sat overnight and will not restart now. I have had him check all his wiring from the ecm to the FICM.Dec 9, 2006 · 6.5L Diesel Engine Duramax First Generation: 2001-2004 (LB7) Duramax Second Generation: 2004.5-2005 (LLY) Closed / Archived Marketplace Ads 6.2L Diesel Engine Top Contributors this Month View AllThe P1029 code in your 2019 Chevy Silverado 2500 High Country with the 6.6L Duramax LP5 engine indicates an open circuit in the fuel pump phase U-V-W circuit. This means that the fuel pump control module (FPCM) isn't sending power to the fuel pump. Here are some possible causes of the P1029 code:1.DTC P0090 is a Type A DTC. The ECM commands the engine to operate in the Reduced Engine Power mode. The message center displays Reduced Engine Power. Conditions for Clearing the DTC. DTC P0090 is a Type A DTC. Diagnostic Aids. There are no driveability concerns associated with the FRP regulator unless a DTC is present.Scanned, P0090 code, cleared it and drove it with the scanner plugged in, pressure was between 4000psi idle and 20000 psi pegged. Cleared code, changed fuel …Here's the codes p2227-00, p0047-00, p2565-00, p0118-00, p0090-00, p0851-00 and p0193-00 I think the truck is possessed. I didnt get any of these codes before I messed with the ecm. I dont get any codes using my old scanner other then the abs ones. Sorry for sounding like a kook.LMM GM Duramax . replaced egr cooler and now getting a p0090 code... Thread starter southerntp; Start date Feb 22, 2011; southerntp New member. Joined Jul 14, 2010 Messages 51 ... Started the truck and now it has a check engine light with a p0090 code saying something about fuel pressure regulator. I unplugged the regulator with the truck ...P0090 is fuel pressure regulator related, not the rail pressure sensor. You either have a sticky FPR, a bad coil in the FPR or no power to the FPR. you need 5v to the FPR for it to be controlled. Thanks! After re-seating X107 and 108 (for some reason were not fully seated, DOH!) that code went away after resetting the codes, the only codes I ...Duramax First Generation: 2001-2004 (LB7) Codes P0088 and P0090 - diagnosis? Jump to Latest Follow 18K views 5 ...With multiple codes. p0193 P154d P154b P0090 P0522 P0102 P0047 P2564 P0107 All codes are mainly for low voltage or high voltage. We have checked all the wiring and haven't found a problem with the wiring yet. ... A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about modifications ...Fixed them all codes gone except one P0090 Fuel Pressure Regulator circuit malfunction. Got a tech 2 and hooked up followed GM DTC flowchart as follows: ... 2024 Chevrolet 2500 High Country Duramax/Alli The only difference between a tax man and a taxidermist is the taxidermist leaves the skin. Mark Twain Member #65 of the A(ACLU) Agent Quack ...Chevy / GMC Duramax 01-04.5 LB7 Forums. 01-04.5 LB7 Duramax Powertrain what code is a b0090 ... There is alot of info for that code. By changing injectors what would cause this code to come up. ... Are you looking for B0090 or P0090? DMax BLACK '05 LS CC LB @ 100K miles, factory 2" lift, HID's Banks Economind, IQ, Intake, ...Chevy / GMC Duramax 06-07 LBZ & LLY Forums ... have this exact code, I did just recently deal with p0090 which is fuel regulator circuit open. ... 30 that you’re in ...P0102 CODE HELP!! I recently started getting a check engine light for code P0102 on my 02 LB7. Truck is tuned on EFI Live for over a year now and has been running great until this issue. Ireplaced the MAF sensor last week with no luck. Pulled the air filter and cleaned it/washed it, no luck. Air filter is not a oiled K&N unit.Replaced Injectors on 2001 Duramax 6.6 and can not get it to run properly. I keep getting P0088 P0089 and P0090 codes. The Fuel rail reads 25,243 psi I replaced the fuel rail presser sensor and also the high presser regulator and still have the same codes. The truck only goes up to 2,000 rpm and has bad fuel knock.Scanned, P0090 code, cleared it and drove it with the scanner plugged in, pressure was between 4000psi idle and 20000 psi pegged. Cleared code, changed fuel …Wentzville Mo. Nov 11, 2008. #76. PPE driver side is .125 and my pass side is .090, Kyle add the vin to that truck to the vin check area and I will tell you what the repair was. Last edited: Nov 12, 2008. D.1. #1max. 100 posts · Joined 2006. #2 · Jul 19, 2007. A p0700 means that there is a code stored in the trans control module that you will have to read. 01 sunset orange ext.cab sb 6 speed 4x4. sb smf sd clutch, ppe tech 4 program , duramaximer, banks exh. Brotherhood of Handshakers #90.However after running great all of a sudden I have a crank no start issue with a p0090 code. I diagnosed the wiring from the ecm to the FPR as having no continuity so I replaced both wires that go from the ECM to FPR. Still has p0090 code and no start. Replaced the ECM with a new one from Flagship 1 still have p0090 code and no start.2006 Savana Van P0090. Jump to Latest Follow 217 views 3 replies 3 participants last post by Ron Nielson Dec 21, 2023. R. RHaynes224 ...Reading the FSM for diagnosing this says if you have a P0088 and a P0090, follow the diagnostic steps for the P0090. Basic diagnosis there requires a scan tool, key on with engine off should have < 20% for the FPR regulator command. After that, it's wiring checks. Unplug the FPR, there should be 12v on pin 1 supplied by the ECM (purple/white on ...Besides this is the first time I have seen a code that comes up in the DTC lookup that made any sense. 2016 F-150 Limited Edition 2015 ZL1 Camaro, Ashen Grey, Full Load, Stock @ 580 HP:clap: ... Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more! Show Less .#1. Hey everyone, This morning I changed my thermostats in the truck because one was stuck open. I changed it by removing serp belt, ac compressor, …P0090, P0192, P0193 Rail Pressure control in closed loop. (closed loop RP control occurs when engine transitions from crank to Run mode) Path1) fail condition true for 10seconds. Path2) fail conditions true for 12.5 seconds . A 09 OBDG01 DURAMAX Engine Diagnostics MAIN SECTION 1 of 1 Section MAIN SECTION Page 1 of 28 1 of 1 SectionP1089 Code. I have a 2019 GMC 3500 Sierra Duramax. I recently threw the code P1089. When I check it at home, it returns as a battery, alternator, or starter problem however when I have it checked at Orielly's, it returned as a Fuel Pressure Rail. I was close to needing to replace my fuel filter prior to the Check Engine lighting on.I was having some issues with my duramax lmm 2008 3500hd. As far as mods go I have an airaid intake, 4 inch; mbrp straight pipe and an h and s tuner. I just encountered the code p0299 (engine turbo charger underboost). So I needed to a smog done to register my truck in California and I detuned my truck, restored the computer to stock for the ...Chevy / GMC Duramax 01-04.5 LB7 Forums. 01-04.5 LB7 Duramax Powertrain. Added Airdog II DF-100 now codes P0090 & P0540. Jump to Latest Follow 1K views ...Duramax Second Generation: 2004.5-2005 (LLY) P0090 code. Jump to Latest Follow 1K views 1 ...If you live for 1s and 0s, here are the best ways you can get paid to code. Most programmers make six-digit salaries, check out these jobs! Learn more about how you can start makin...0. 0. Fayettenam, NC. Oct 3, 2017. #1. Just got done installing new injectors and a FASS lift pump. Now I have an extremely lopey Idle and a P0193 code. I've traced wires, plugged and unplugged connections, checked for bent pins, and found nothing that appears wrong. The FPR is a brand new Bosch LB7 Fuel Pressure Regulator that I installed ...6.5L Diesel Engine Duramax First Generation: 2001-2004 (LB7) Duramax Second Generation: 2004.5-2005 (LLY) 6.2L Diesel Engine Fuel System, Air, Exhaust & Emissions Upgrades Top Contributors this Month View All1 post · Joined 2022. #13 · Jan 5, 2022. I was also getting code P249D and was able to fix it by replacing the def injector. I purchased part # 12688993 from Rock Auto, $95 half the price of the dealership, installed using the link below for a reference, and it is now fixed. The code came back a couple of times after replacing it for the ...DTC P0090 is a Type A DTC. The ECM commands the engine to operate in the Reduced Engine Power mode. The message center displays Reduced Engine Power. Conditions for Clearing the DTC. DTC P0090 is a Type A DTC. Diagnostic Aids. There are no driveability concerns associated with the FRP regulator unless a DTC is present.This morning I changed my thermostats in the truck because one was stuck open. I changed it by removing serp belt, ac compressor, removing the two main plugs that rest above the hardline to the upper rad hose. No problem changing them out but I put everything back together and I immediately get a P0090 code.ok here's the story. i just did a PPE dual cp3 kit on an 08 LMM. truck was fine before this, no codes at all. we put the kit on and now there is a hard p0090 code. dan and i have been racking our brain the past 3 days and nothing has worked. this code comes on as soon as the key is turned on, you clear it and it come back right away. at idle FP is 11k …The video focuses on the basic GMC specific diagnostic error code.Contents:0:21 Basic DTC analysis according to OBD2 protocol standard.1:48 Insight into prog...This is a short, simple case study on a crank, no start L5P Duramax with new crate engine. Reading through service info, gave quick direction to the issue.Can someone please help, i have an 03 silverado 2500 with a duramax, it is bone stock, intermittently i will get either a crank no start, or the truck my stall out when running, and sometimes i will have a code p0370. sometimes it will immediately restart, other times it will sit for several hours then restart.The Code of Hammurabi is an important artifact because it sheds light on laws in Babylonia. Learn why the Code of Hammurabi explains "an eye for an eye." Advertisement When we thin...Some customers may comment that the MIL is illuminated. Some technicians may find one or more of the following DTCs set in the Engine Control Module (ECM): P0087: Fuel Rail Low Pressure. P0089: Fuel Pressure Regulator 1 Performance. P0191: Fuel Rail Pressure Sensor 1 Performance. P026D: Injection Quantity Too High.Duramax LBZ and LMM P0087 Low Fuel Pressure code Summer comes, temps rise, and the working trucks with relatively high miles start to set a P0087 code and go into limp mode while towing. I am on the receiving end of continuous calls over the past few years inquiring what to do. This has prompted me to write this Tech Tip to help explain better ...2003 chev 2500hd with Duramax, was going down road and it died, 1/2 tank fuel,I pushed primer pump until solid, started and drove about 2 miles and died for good, has a code p0090, p0380, and code u-1 … read moreMay 12, 2012 · There were other codes for the glow plug circuits, but I only concentrated on the main code (U0106 -lost communication with glow plug control module). I used my Snap On Solus Pro scanner and was able to check the code and operation of the control module. There was no response from the controller.This is a short, simple case study on a crank, no start L5P Duramax with new crate engine. Reading through service info, gave quick direction to the issue.So much has changed about the way people make calls. For example, you can’t even call your next door neighbor’s landline without using an area code, and you certainly can’t call mo...So much has changed about the way people make calls. For example, you can’t even call your next door neighbor’s landline without using an area code, and you certainly can’t call mo...2008 2500 HD Duramax. Engine dies and goes into P0090 Fuel pressure regulator control circuit. I changed FPR and code still on doing same thing engine power reduced P0090. I checked harness everything seemed to be in good condition. I think I should go back and check harness.No Start U1800/P0090. I haven't started the truck for about a month, so the batterys where drain. I charged them up and try starting the truck. It would crank and crank and will not start. So I primmed the fuel by the filter and the same no start. Now I scanned for codes and I get U1800 and P0090 then I erase the codes and scanned again and it ...Chevy / GMC Duramax 11-16 LML Forums. 11-16 LML Duramax Powertrain. Code p0098. Jump to Latest Follow 31K ... But I have a constant CEL code p0098. Intake air sensor #2 high. Everytime I clear the codes it returns. I found 3 different senors in the intake system have pulled all 3 out and ohmed them.2003 chev 2500hd with Duramax, was going down road and it died, 1/2 tank fuel,I pushed primer pump until solid, started and drove about 2 miles and died for good, has a code p0090, p0380, and code u-1 … read moretruck, 2007 silverado HD 2500 vin D6.6 duramax code..air intake hello, i am having a heck of a time with this truck, 2007 silverado HD 2500 vin D 6.6 duramax code P0540 air intake heater curcuit A a local shop told me it was the glow plug modual origianaly. we had …116. 0. 0. Feb 5, 2008. #1. P009E = fuel rail pressure relief valve performance. I get this code on one of my tunes where the fp is perfect, and it holds my 3200 pulsewidth perfectly. When it sets this code it goes to reduced power mode. Will set it every time I …Mar 15, 2022 · Issues with the PCM can trigger the P0090 code. P0090 and Common Rail Fuel Systems. P0090 is a very important code on vehicles that use “common rail” fuel injection (CRI), such as light truck diesel engines, i.e., the GM Duramax Diesel, Ford Powerstroke, or Dodge Cummins.Check engine light comes on and have loud injectors. Check the code and it shows P0088, high fuel rail pressure. Took out the Tech 2 and have a Commanded Pressure of 5838 and an actual of 19,875. Left the truck alone for the week and went out today to try to check the voltages to the two fuel pressure regulators, stock and Dual Fueler, and the ...P0090 Fuel Pressure Regulator 1 Control Circuit; P0092 Fuel Pressure Regulator 1 Control Circuit High; Symptoms & Severity. Since excessive fuel pressure may lead to a variety of drivability issues and cause internal engine and catalytic converter damage, a code P0091 should be considered severe. Symptoms of a P0091 code may include:Reading the FSM for diagnosing this says if you have a P0088 and a P0090, follow the diagnostic steps for the P0090. Basic diagnosis there requires a scan tool, key on with engine off should have < 20% for the FPR regulator command. After that, it's wiring checks. Unplug the FPR, there should be 12v on pin 1 supplied by the ECM (purple/white on ...Other Symptoms Of Getting P0191 Code On Duramax. The P0191 trouble code initiates the check Engine Light located on your instrumental panel. When the Furl rail Pressure causes trouble, the regulator fails to regulate the fuel injection. And you can hear the sound of constant fuel injection when you turn over the vehicle.Oct 31, 2020 · 28. Oregon. Oct 31, 2020. #5. P0090 diag runs when the key is on and the commanded FRP regulator current is between 400-1500mA. The DTC sets if the FRP current is not between 50-1600mA. A wire may have been broken during your repair, or possibly smashed under something (grounding out).How to fix a P0193 engine code: Fuel Rail Pressure Sensor Circuit High Input A P0193 Code is set when the fuel rail pressure sensor reports pressure is abno...I ran the codes and these all came up. P1711,P1723,P0708,P0090,P0193,P0540,P0700 If anyone could help me with these codes please let me know. Thanks . ... A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! ...Duramax First Generation: 2001-2004 (LB7) Stalling, P0090. Jump to Latest FollowHi I Have a 06 Duramax and the code p0090 popped up so i replaced the Fuel pressure regulator and that didnt fix the problem, but while i was in there i seen the wiring harness for the fuel pressure regulator had a little cut in it so i replaced that hoping that would solver the problem but it didnt. ... -5-lbz-lly/452928-intermitent-p0090-code ...This means you will probably not notice any other symptoms than a check engine light on your dashboard. Here are the symptoms of the P0190 code: Check Engine Light / Service Engine Soon Light. The engine will not start. Hard starting condition / Long cranking time. The engine makes sudden stops.Connect the test lamp between the solenoid supply voltage circuit, terminal 1 and the solenoid control circuit, terminal 2. The test lamp should illuminate. If the test …P0090 and P0091 Codes. Jump to Latest Follow ... 2016 GMC Canyon SLT 4x4 2.8L Duramax, Rough Country 2" Level, Helo 909 17" Wheels w/ Falken Wildpeak AT3W 265/70R17, Diode Dynamics Off Road Light Bar and SS3 Pro Ditch Lights, Custom SNM/Feniex Emergency Lighting. Save Share.What the P0090 code means. P0090 is an OBD-II code telling us there is a fault found within the fuel pressure regulator control circuit. This DTC is triggered when the ECM finds out-of-range performance from the control circuit. Out of range performance causes a Check Engine Light and a failsafe mode. Failsafe mode will remain in effect until ...i have two codes showing a p0047, and p0090. they both came on this morning. i put in a new stereo last night and blue the radio fuse in the fuse panel located in the engine compartment. I replaced the fuse and I'm hoping i just knocked something loose . please advise ... I have a short in the power to the XM on a 2005 GMC 2500 HD duramax.03 duramax, code p0090, engine won't run over 2k rpm. code. ... gaskets went had heads tested ok got it all done but won't start has pulse at inj but can't get fuel rail pressure got code p0090 with scanner on it ...May 11, 2014 · The issues started getting worse again. Right up un, I'm getting an intermittent P0090 code for the FPR circuit. I've checked all the wiring , 116. 0. 0. Feb 5, 2008. #1. P009E = fuel rail pressure relief valve perfor, try turning the key on, then off, leave the key off, wait about 4-5 minutes th, Jan 6, 2019 · P0090 code and truck won't star, Apr 26, 2011 · Condition/Concern: A dealer may need to perform a repair , What the P0088 code means. P0088 is a OBD2 trouble code that te, My truck started in limp mode this morning and has, What causes the p0090 code to be triggered? No rough or , 2008 2500 HD Duramax. Engine dies and goes into P009, P0090 is a very important code on vehicles that use “commo, If the ECM detects a problem in the FRP regulator circuit, it will s, VolkswagenP0090 Volkswagen DTC P0090 Make: Volkswagen Code: P0090 De, P0091 Chevrolet Fuel Pressure Regulator Control Circuit Low Volta, If DTC P0090, P0168 or P0191 is also set, refer to Diagnostic Tr, mijdirtyjeep. You need to fix the source of the problem. As s, Chevy / GMC Duramax 06-07 LBZ & LLY Forums. 06-07 LBZ & , P0094 or P1094 show a slight difference but enough to throw a cod.