GMC Cars & Trucks - Popular Questions, Answers, Tips & Manuals

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.

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

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.

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.

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

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 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 ..

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

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

Fuel injectors are typically driven directly by power transistors in the engine computer. Relays are just not fast enough to provide the fine timing control needed. There might be an individual fuse for each injector soldered to the computer board, but I haven't ever looked at one for your model, and I've never seen injectors individually fused. Before chasing that, verify that the electrical resistance of the injector coil is the same as the other injectors. The typical resistance is between 100 and 1000 Ohms. If the coil resistance differs by more than 10%, replace the injector coil (it may be easier to remove the coil from a new injector and switch it with the old one than to pull the entire injector out and replace it, if not, change the injector). Shorts in the coil that lower the resistance are sometimes a problem. Also check the injector cable for continuity. An easy way is with an ohmmeter that can read at least 20 Megohms. First, check the resistance between the terminals on a good cable. You should read a very high resistance - this is the leakage through the transistor and any protective components, and is some number between 5 and 20 megohms. The exact number doesn't matter, as long as you see something and it is not a short circuit (less than 1 Ohm). This verifies that the test will work (if it reads over-range, either your probe tips can't reach the contacts in the connector, or the test is otherwise not valid). Next, repeat on injector 1. If it reads open circuit (over-range), check the injector cable (note: an open fuse will give the same result as a broken wire).

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.

when you disconnected the battery you cleared all codes and your emissions[ smog/emissions need to run their cycles to be smog test ready as of now you will fail test ------https://smogcheckvacaville.com/general-motors-drive-cycle-for-smog-check/ ------------------https://repairpal.com/how-to-perform-a-basic-drive-cycle

Where is the onstar module on 2022 gmc sierra 1500. N9 N9.

JustAnswer https://www.justanswer.com > GMC Questions Sep 3, 2022 - It is located behind the left side of the dash. Location diagram and directions to access are attached for you. Ask Your Own GMC Question. GMC ... 1 answer · Top answer: Hi! Welcome to JustAnswer. Thank you for contacting us for assistance with

Question edited for clarity. Question moved to model category. There are injector and also 'air injector' fuses. Not sure what the latter are though? Press CTRL+F and type injector and press enter.

GMC Envoy (2002-2009) fuses and relays

Fuse Box Diagrams https://fuse-box.info > gmc > gmc-envoy-2002-2009-... Engine compartment fuse box ... It is located under the hood in the engine compartment on the driver's side of the vehicle. ... Remove the primary cover by pressing ... ..

Time to get your test gear out and find out where the damage is. (Replacement 'computers', in some vehiles, don't normally work unless they have been reprogrammed with the rest of the system).

Backfiring can be caused by leaking valves, (compression leak test will show this), an air leak in the inlet manifold, incorrect timing. incorrect mixture or an air leak in the exhaust manifold. Very undesirable as it can lead to engine damage.

Question edited for clarity, wrong type of break vs brake. Question moved to model category. Take it back to the shop. They have a duty of car to fix what you take it in for and not break anything else. Their scan tool should diagnose the issue in 5 minutes. https://www.google.com/search?q=2006+GMC+Envoy+all+the+cluster+light+are+on ..

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

You actually have 4 of them, an upstream and a downstream on each bank of cylinders. You only replace the one that failed. The code will tell you, Bank 1 or Bank 2, and Sensor 1 or Sensor 2. https://www.google.com/search?q=2016+gmc+sierra+1500+replace+o2+sensor ..

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