GMC Recent Questions, Troubleshooting Help & Support

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.

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. : )

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

Question edited for clarity. Question moved to model category https://www.google.com/search?q=2004+GMC+Envoy.+The+tailgate+will+not+open ..

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

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.

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...

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 . ..

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 ..

That all sounds like alarm / door lock issues. You need an auto electrician with a pro grade scan tool computer. https://www.google.com/search?q=auto+electrician+near+me ..

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

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 ..

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 ??

The fuel filter for the 2009 Acadia is built into the fuel pump. To replace it, the pump will have to be replaced.

7/8" Oxygen Sensor Socket or Wrench and one electrical plug. https://www.freeautomechanic.com/ho2s-heated-oxygen-sensor.html

The C0292 code in your 2004 GMC Yukon Denali XL indicates a communication issue between the Powertrain Control Module (PCM) and the Electronic Brake Control Module (EBCM). Here are some steps to diagnose and potentially fix the problem: Check Ground Connections: Inspect the ground connections related to the PCM and EBCM. Follow the ECM ground and ABS module ground. Check the ground on the firewall (driver's side) and the frame rail under the driver's seat. Also, verify the engine ground on the driver's side. Inspect Wiring and Connectors: Visually examine the wiring harness and connectors associated with the EBCM. Look for any signs of damage, such as broken wires or corroded pins. Ensure that the connector pins are not bent or pushed out. Pay attention to any loose or poor electrical connections. Consider the Tune: If you've recently modified the vehicle's tuning, consider reverting to a different tune. Sometimes, a specific tune can cause communication issues. If you suspect the tune, contact the tuner for further guidance1. Professional Diagnosis: If the above steps don't resolve the issue, it's advisable to seek professional help. A qualified mechanic can perform a thorough diagnosis using specialized tools. Keep in mind that diagnostic costs typically range from $75 to $150 per hour.

It is not legal to 'adjust' speedometers. Fit the correct sized rims and tyres and the speedometer reading will be correct or use a satnav for real time speed.

Hi there:Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.Symptoms may include:the engine may be harder to startthe engine may stumble / stumble, and/or hesitateother symptoms may also be presentA code P0300 may mean that one or more of the following has happened:Faulty spark plugs or wiresFaulty coil (pack)Faulty oxygen sensor(s)Faulty fuel injector(s)Burned exhaust valveFaulty catalytic converter(s)Stuck/blocked EGR valve / passagesFaulty camshaft position sensorDefective computerPossible Solutions: If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.Thank you for using FixYa, have a nice day.

The BCM is located on the lower left side of the dashboard just below the steering column

The problem may be the engine coolant sensor. If the sensor fails the engine will stop when normal operating temperature is reached . When engine is cold it will start.