GMC Cars & Trucks - Recent Questions, Troubleshooting & Support

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2004 GMC Sierra Z71, service 4 wheel drive message, no lights on the push button switch, but the switch does light up when the vehicle is first cranked, no codes showing, any suggestions.

The service 4-wheel drive message on your 2004 GMC Sierra Z71 can be caused by a few different factors. Here are some steps you can take to diagnose and potentially resolve the issue: Software Update: GM has issued a software update to address this problem. Do not replace the Transmission Case Control Module (TCCM). After reprogramming with the most current update, perform a Clutch Reset Procedure (Motor Learn Procedure). Check Transfer Case Electrical Connectors and Wiring: If you have error codes like C0387, C0387, or C0569 stored, inspect the transfer case electrical connectors and wiring. Fuse Pull Reset: Some users have reported success by pulling the TREC 30A fuse for about 30 seconds. This action may reawaken a possibly "sleeping" Transfer Case Control Module and trigger the 4WD switch to light up. Service 4WD plus no lights in 4WD Selector Switch ' GM Truck Club Forum Chevy / GMC Truck: Service 4WD Message & No 4WD (youtube.com) [SOLVED] - 4WD, 4x4, (Four Wheel Drive) Switch - No Lights ' Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum (trailvoy.com)
5/15/2024 12:55:03 PM • GMC Cars &... • Answered on May 15, 2024
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2004 GMC Envoy Xl 4.2l will trouble code p1633 cause engine to run like it have a misfire?

Definition of check engine code P1631: BMW: Throttle Valve Actuator Bank 1 Spring Test Malfunction Chrysler/Dodge/Jeep: TCM Internal - Processor Clock Performance Citroen/Peugeot: Theft Deterrent Start Enable Signal Not Correct/ Main Relay Malfunction (Power Hold) Daewoo: ECU COMM. LINE MAL Ford: Theft Deterrent Start Enable Signal Not Correct/ Main Relay Malfunction (Power Hold) GM: Theft Deterrent Start Enable Signal Not Correct Probably not.
5/13/2024 1:25:25 PM • GMC Cars &... • Answered on May 13, 2024
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Why won't my parking lights turn off on my 2004 GMC envoy XL

KEY off head lamps off , parks stuck on. right? parks fail driving HL switch off? jiggly head lamp switch is not cure. r? Is car in CANADA with those silly DRL lamps <day light running lamps and this fails or is DRL confusing? not told, the fULL STORY, there IS ONE. 2004 GMC envoy all things that fail (park) and all other things that work great.? LIKE"? car starts ,runs ,drives ,goes far even at night and nice bright head lamps, ? all 10 parking lamps stuck, on front/sides, rear? , license lamps how about Cluster lamps.? tell it all in brief. the check all fuses.? and then scan the OBD2 port under dash (USA CARS)? scan it ,it will have lots of DTC errors so post them.? just park fails (and not a DRL car optioning canada) it can be the more simple cheap fix park relay bad named PARK LP (30) read fuse box. or BCM bad or scanned show errors or the head lamp switch is bad tell the BCM lies. to run all tests. be sure the cars main battery is not weak or bad or fails a load test or scans show this? dtc1-undefined-undefined-0.jpg
5/11/2024 11:32:56 AM • GMC Cars &... • Answered on May 11, 2024
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How much brake fluid i need to bleed air out of one brake caliper?

It has ABS Joe You either need a pressure bleed bottle to pump fluid from the caliper to the reservoir, or you use a Pro grade bi-directional scan tool computer to open the valves in the ABS unit. You can't do it the old way if there is air in the system before the ABS unit. You might be able to rent from Autozone. Or give Google a go and see if there are video tricks (year) GMC (model) bleed brakes You have been here long enough to know 'year make model', first three words in every question :>D ..
5/1/2024 11:13:02 PM • GMC Cars &... • Answered on May 01, 2024
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How to fix lift gate on 2009 gmc Acadia

Would all depend on what's wrong with it.
5/1/2024 7:54:51 PM • GMC Cars &... • Answered on May 01, 2024
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1991 GMC Sonoma 2.5 engine replaced fuel pump, filter. and distributer cap. The truck will randomly die going down the road. After it sits for10 minutes it will restart and run completely normal

Good place to get a vacuum gauge hooked up and identify problems using that tool. Without the gauge, check your exhaust and see how much if passing through the converter. You can do this by testing the temperature of the exhaust before and after the converter making sure the converter/exhaust isn't restricted. As the vehicle warms up a bad converter can cause the symptoms you are describing.
4/18/2024 12:24:16 AM • GMC Cars &... • Answered on Apr 18, 2024
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How do you get the interior lights to come on when

Hi, viewer. The interior light is powered and controlled by the body control module or BCM. However, there is an on/off button beside the main headlight switch that overrides the interior lighting function. If this button is off, interior lights will not come on regardless of any door being closed or opened.

If this button is on, interior lights will come on whenever a door is opened. If you close all doors, and if the driver door is the last to be closed, the interior lights will stay on for about 30 sec and then the lights goes off automatically. In case you left any door opened too long, the BCM has an internal timer that will shut off the interior lights automatically when it detects that a door is still opened and the allowable time has elapsed. The BCM is programmed this way to protect the battery circuit and functions. : )


4/17/2024 11:11:22 AM • 2008 GMC Acadia • Answered on Apr 17, 2024
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I am getting code p0016 on my 2004 gmc envoy. what could be causing the issue and how do I correct it?

All vehicle info is on the internet You just Google your questions & your codes Type: OBD POO16 Obviously you need a repair shop to check for codes & use them to find a problem
4/14/2024 8:57:36 AM • 2004 GMC Envoy • Answered on Apr 14, 2024
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2004 GMC Envoy SLT 4.2l 4 wheel drive. Why does the rear wheel stop turning or lockup when I put the shift lever in drive when I have either one of the rear wheel off the ground?

Hello Joe At some stage someone has has the vehicle in 4 wheel (especially if it have a 'Low Shift)' and has done a tight circle. When that happens the inner wheel in the turn tries to turn slower or even backwards. To fix it. Chock the front wheels and with the truck in neutral, jack up each rear wheel and let is spin and untangle itself. If you have a trolley jack, you can lift both sides
4/12/2024 2:02:56 AM • 2004 GMC Envoy... • Answered on Apr 12, 2024
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How do i check the automatic transmission? fluid on a 2004 GMC Envoy 4.2l

P1860 = TCC PWM Solenoid Circuit Electrical P0740 = Torque Converter Clutch Circuit/Open and P0785 = Shift Timing Solenoid "A" Maybe spurious codes, I can't tell.
4/9/2024 10:07:41 AM • GMC Cars &... • Answered on Apr 09, 2024
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2008 GMC Envoy. How can I get lighter unstuck?

Drill a hole in a piece of plywood that fits over the lighter. Have someone press the plywood onto the plastic. Put a cord with slip knot over the lighter stem and add a wooden T-Handle to the other end of the cord, you pull and the other person presses.Just noticed this is an old question that has had spam removed which resurrected it...
4/2/2024 5:40:09 PM • 2008 GMC Envoy • Answered on Apr 02, 2024
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How many o2 sensors does a 2002 GMC Envoy have please?

Welcome. Two O2 sensors. One in the exhaust manifold and another after the cat. Feb 9, 2010

How many O2 sensors are there?

trailvoy.com https://www.trailvoy.com > ... > Exhaust Mods

How Many O2 Sensors Are on This Vehicle?

2CarPros https://www.2carpros.com > ... > Location Dec 27, 2021 - Hello, this vehicle has two oxygen sensors, the rear one is behind the Catalytic Converter. Below is a picture of its location to the right side . ..
4/2/2024 3:18:03 AM • GMC Cars &... • Answered on Apr 02, 2024
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2012 GMC Yukon. What does DTC P0601 mean?

Diagnostic trouble code (DTC) P0601 stands for "Internal Control Module Memory Checksum Error." It is triggered when the powertrain control module (PCM) detects an internal problem, typically a failed Memory checksum test. The PCM's memory checksum test is performed regularly.Oct 27, 2023

P0601 Code: Internal Control Module Memory Checksum Error

CarParts.com https://www.carparts.com > ... > OBD-II Trouble Codes ..
4/2/2024 3:12:05 AM • GMC Yukon Cars &... • Answered on Apr 02, 2024
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2006 Yukon Denali. Where is my ECM located on my Denali please?

Question edited for clarity. Question moved to model category. Duplicate question deleted. Refresh page to see your question. Question answer by Jeff Armer, our Automotive Electronics Tech. Jeff Armer Mar 30, 2024 Under the hood in the engine compartment .And it's called a PCM - powertrain control module. Powertrain Control Module (PCM) At the left front side of the engine compartment -------------------------------------------------------------------------------- Powertrain Control Module Connector End Views Connector 1: Powertrain Control Module (PCM) C1 Connector 2: Powertrain Control Module (PCM) C2 Powertrain Control Module (PCM) C1 Connector Part Information OEM: 12191110 Service: 12167308 Description: 80-Way F Micro-Pack 100W Sealed (BU) Terminal Part Information Pins: 1- 7, 11, 12, 14, 15, 19-21, 23-30, 33, 36, 37, 39, 40, 43-, 48, 51, 54, 57, 58, 61, 63-70, 73-77, 80 Terminal/Tray: See Terminal Repair Kit Core/Insulation Crimp: See Terminal Repair Kit Release Tool/Test Probe: See Terminal Repair Kit Powertrain Control Module (PCM) C1 Pin Wire Color Circuit No. Function 1 BK/WH 451 Ground 2 L-GN 1867 12-Volt Reference 3 PK/BK 1746 Fuel Injector 3 Control 4 L-GN/BK 1745 Fuel Injector 2 Control 5-6 -- -- Not Used 7 GY 2705 5-Volt Reference 8-10 -- -- Not Used 11 L-BU 1876 KS 2 Signal 12 D-BU/WH 1869 CKP Sensor Signal 13 -- -- Not Used 14 OG/BK 1061 UART Serial Data 15 D-BU/WH 774 UART Serial Data 16-18 -- -- Not Used 19 PK 439 Ignition 1 Voltage 20 OG 440 Battery Positive Voltage 21 YE/BK 1868 Low Reference 22 -- -- Not Used 23 BK 470 Low Reference 24 BK/WH 451 Ground (NC1/NC8) 25 TN 1671 HO2S Low Signal Bank 2 Sensor 2 (NC1/NC8) 26 TN 1667 HO2S Low Signal Bank 2 Sensor 1 27 BK/WH 451 Ground (NC1/NC8) 28 TN/WH 1669 HO2S Low Signal Bank 1 Sensor 2 (NC1/NC8) 29 TN 1664 HO2S Low Signal Bank 1 Sensor 1 30 L-GN 1478 Coolant Level Switch Signal 31-32 -- -- Not Used 33 PU 420 TCC Brake Switch/Cruise Control Release Signal 34-35 -- -- Not Used 36 BK 1744 Fuel Injector 1 Control 37 YE/BK 846 Fuel Injector 6 Control 38 -- -- Not Used 39 YE/BK 625 Starter Enable Relay Control 40 BK/WH 451 Ground 41-42 -- -- Not Used 43 RD/BK 877 Fuel Injector 7 Control 44 L-BU/BK 844 Fuel Injector 4 Control 45 GY 2700 5-Volt Reference 46 GY 474 5-Volt Reference 47 -- -- Not Used 48 GY 597 5-Volt Reference 49-50 -- -- Not Used 51 D-BU 496 KS 1 Signal 52-53 -- -- Not Used 54 OG/BK 469 Low Reference 55-56 -- -- Not Used 57 OG 440 Battery Positive Voltage 58 D-GN 1049 Class 2 Serial Data 59-60 -- -- Not Used 61 PK/BK 632 Low Reference 62 -- -- Not Used 63 BK 2755 Low Reference 64 BK/WH 451 Ground 65 PU 1670 HO2S High Signal Bank 2 Sensor 2 (NC1/NC8) 66 PU 1666 HO2S High Signal Bank 2 Sensor 1 67 BK/WH 451 Ground 68 PU/WH 1668 HO2S High Signal Bank 1 Sensor 2 (NC1/NC8) 69 PU/WH 1665 HO2S High Signal Bank 1 Sensor 1 70 BN 1174 Oil Level Switch Signal 71-72 -- -- Not Used 73 BN/WH 633 CMP Sensor Signal 74 YE 410 ECT Sensor Signal 75 PK 1020 Ignition 0 Voltage 76 BK/WH 845 Fuel Injector 5 Control 77 D-BU/WH 878 Fuel Injector 8 Control 78-79 -- -- Not Used 80 BK 407 Low Reference Powertrain Control Module (PCM) C2 Connector Part Information OEM: 12191110 Service: 12167308 Description: 80-Way F Micro-Pack 100W Sealed (GN) Terminal Part Information Terminal/Tray: See Terminal Repair Kit Core/Insulation Crimp: See Terminal Repair Kit Release Tool/Test Probe: See Terminal Repair Kit Powertrain Control Module (PCM) C2 Pin Wire Color Circuit No. Function 1 BK/WH 451 Ground 2 -- -- Not Used 3 TN 1465 Fuel Pump Relay Control - Secondary 4-8 -- -- Not Used 9 D-GN/WH 465 Fuel Pump Relay Control 10 WH 121 Engine Speed Signal 11-13 -- -- Not Used 14 RD/BK 380 A/C Refrigerant Pressure Sensor Signal 15 BN 25 Charge Indicator Control 16 GY/BK 1694 4WD Low Signal 17-19 -- -- Not Used 20 L-GN/BK 822 VSS Low Signal 21 PU/WH 821 VSS High Signal 22-24 -- -- Not Used 25 TN 472 IAT Sensor Signal 26 PU 2121 IC 1 Control 27 RD 2127 IC 7 Control 28 L-BU/WH 2126 IC 6 Control 29 D-GN/WH 2124 IC 4 Control 30 -- -- Not Used 31 YE 492 MAF Sensor Signal 32 L-GN 432 MAP Sensor Signal 33 -- -- Not Used 34 D-GN/WH 428 EVAP Canister Purge Solenoid Control 35-38 -- -- Not Used 39 RD 631 12-Volt Reference 40 BK/WH 451 Ground 41-42 -- -- Not Used 43 D-GN/WH 459 A/C Compressor Clutch Relay Control 44 -- -- Not Used 45 WH 1310 EVAP Canister Vent Solenoid Control 46 BN/WH 419 MIL Control 47-48 -- -- Not Used 49 YE/BK 1827 Vehicle Speed Signal 50 D-GN/WH 817 Vehicle Speed Signal 51 -- -- Not Used 52 BN 2391 HO2S Heater Low Control Bank 1 Sensor 2 (NC1/NC8) 53 RD/WH 3223 HO2S Heater Low Control Bank 2 Sensor 2 (NC1/NC8) 54 PU 1589 Fuel Level Sensor Signal - Primary 55-56 -- -- Not Used 57 BK 552 Low Reference 58 TN/WH 332 Oil Pressure Sensor Signal 59 PU 806 Crank Voltage 60 BN 2129 Low Reference 61 BN/WH 2130 Low Reference 62-63 -- -- Not Used 64 D-GN 890 Fuel Tank Pressure Sensor Signal 65 -- -- Not Used 66 PU/WH 2128 IC 8 Control 67 RD/WH 2122 IC 2 Control 68 D-GN 2125 IC 5 Control 69 L-BU 2123 IC 3 Control 70-71 -- -- Not Used 72 BK/WH 3113 HO2S Heater Low Control Bank 1 Sensor 2 (NC1/NC8) 73 D-BU 1936 Fuel Level Sensor Signal - Secondary 74 L-GN 3212 HO2S Heater Low Control Bank 2 Sensor 1 75 GY 23 Generator Field Duty Cycle Signal 76-79 -- -- Not Used 80 BK 2751 Low Reference
3/30/2024 8:20:44 PM • 2006 GMC Yukon... • Answered on Mar 30, 2024
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2002 GMC Envoy. Master Cylinder replacement now brakes are seizing, why?

Question edited for clarity and typos, wrong type of break vs brake The only thing different is the Master Cylinder, so it won't be the proportion valve or the brake line. There is a fault with the master cylinder. This link tells how to test.

Brake Dragging Condition After Master Cylinder ...

Brake & Front End https://www.brakeandfrontend.com > brake-dragging-... Jun 23, 2016 - This is most likely due to the pedal mechanism or booster pushrod keeping the master cylinder slightly applied, impeding the capability of the ... Lots more help here and videos as well. https://www.google.com/search?q=2002+GMC+Envoy.+Master+Cylinder+replacement+now+front+brakes+are+seizing ..
3/26/2024 11:55:56 PM • 2002 GMC Envoy • Answered on Mar 26, 2024
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1997 GMC Jimmy. My windows will not roll up or down unless the blower motor is running!

I would check wires at doors opening . you have to remove rubber and look for open circuit. Pull on each wire . you will see. Ground problem ??
3/23/2024 12:14:13 AM • 1997 GMC Jimmy • Answered on Mar 23, 2024
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LOCATION FOR A FUEL FILTER FOR A 2009 GMC ACADIA SLT 3.6 L ENGINE

The fuel filter for the 2009 Acadia is built into the fuel pump. To replace it, the pump will have to be replaced.
3/22/2024 4:01:15 PM • GMC Cars &... • Answered on Mar 22, 2024
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How to replace bank 2 oxy sensor on my 2016 GMC sierra 1500 5.3

7/8" Oxygen Sensor Socket or Wrench and one electrical plug. https://www.freeautomechanic.com/ho2s-heated-oxygen-sensor.html
3/17/2024 3:46:47 PM • GMC Cars &... • Answered on Mar 17, 2024
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