GMC Cars & Trucks - Recent Questions, Troubleshooting & Support


First do a throttle body cleaning. There are many ways to do it. Here is one of them.

https://www.youtube.com/watch?v=Gisr5dK0WDg

GMC Cars &... | Answered 21 hours ago


Did you check the headlamp relay ? left and right headlamp fuse's ? I assume your headlamps aren't working ?

GMC Cars &... | Answered 2 days ago


The knock sensor is located on the engine block, cylinder head or intake manifold. This is because its function is to sense vibrations caused by engine knock or detonation. The PCM uses this signal to alter the ignition timing and prevent detonation.

The 4.3-liter's sensor is on the right cylinder head, beneath the rear of the exhaust manifold.

https://itstillruns.com/knock-sensor-43-vortec-engine-7911114.html

GMC Cars &... | Answered 3 days ago


Not the best photo we have seen on here - I think it says "left front speed sensor circuit fault(y).

This is the sort of fault that would be discovered by the abs during the switch on self test which would result in the light failing to extinguish and the system remaining inactive.

Replacing the sensor might rectify the fault and might not, depending where in the circuit the fault is - which could be anywhere in the wiring between the sensor and the ECU and could be faulty connections or maybe the sensor or even the ECU.

GMC Cars &... | Answered 3 days ago


https://www.youcanic.com/guide/2002-2009-chevrolet-trailblazer-gmc-envoy-fuse-box-location

This will show you where the box is and what the fuses control. Make sure you scroll to the bottom of the post.

GMC Cars &... | Answered on May 26, 2020


Fuse 39 is the HVAC 1 under the drivers rear seat.

GMC Cars &... | Answered on May 26, 2020


There is a door called the blend door, it controls air tmerature, it may be defective or the electric motor that moves it..

2005 GMC Yukon | Answered on May 25, 2020


These are the radio wiring colors on a GMC Silverado:
Car Radio illumination wire: Brown
Radio ground wire: White/Black
Stereo Amp trigger wire: Pink
Stereo dimmer wire: Gray
Left front speaker + wire: Tan
Left front speaker - wire: Gray
Right front speaker - wire: Dark green
Right front speaker + wire: Light green
Left rear speaker - wire: Yellow
Left rear speaker + wire: Brown
Right rear speaker - wire: Light blue
Right rear speaker + wire: Dark blue

2002 GMC Sierra... | Answered on May 25, 2020


Fuse number 13 is the cigarette lighter fuse, it is in the engine compartment fuse box on your GMC Envoy. To know more about where each fuse is and what it does, follow this link: https://fuse-box.info/gmc/gmc-envoy-2002-2009-fuses-and-relay

2003 GMC Envoy | Answered on May 25, 2020


Firing order is 1, 5, 3, 6, 2, 4. Number 1 cylinder is up front. Why would you need the firing order, this engine does not have plug wires, each plug has its own coil pack, each coil pack is controlled by the computer.

GMC Envoy Cars &... | Answered on May 25, 2020


There is a small notch along the (bottom) edge. You slide a small straight screwdriver or pick into the notch which takes pressure off a flat spring wedge. Keep pressure on the screwdriver and slide mirror base (upward) off the mount.

GMC Cars &... | Answered on May 25, 2020


Crank sensor is right behind your harmonic balancer (3 or 4 pin connector). You cam sensor is in your distributor under your rotor...

2003 GMC Safari | Answered on May 22, 2020


These are the radio wiring colors on the 2003 GMC Sierra:
• Car Radio illumination wire: Brown
• Radio ground wire: White/Black
• Stereo Amp trigger wire: Pink
• Stereo dimmer wire: Gray
• Left front speaker + wire: Tan
• Left front speaer - wire: Gray
• Right front speaker - wire: Dark green
• Right front speaker + wire: Light green
• Left rear speaker - wire: Yellow
• Left rear speaker + wire: Brown
• Right rear speaker - wire: Light blue
• Right rear speaker + wire: Dark blue

2003 GMC Yukon... | Answered on May 18, 2020


I have never seen a chart for such purposes - usually it is taken as read the clearance with new bearings and new crankshaft will be correct. The engine data in the repair manual or the data book will state the maximum journal taper and ovality and the maximum bearing clearance when assessing a worn engine.
The use of Plastigage makes finding the bearing clearances much easier and is very accurate - moreso than measuring the internal diameters.

Usually it is sufficient to assume the rods and mains are ok unless damage is suspected and simply measure the crank journals and compare the results with data.
When measuring it is important to be accurate as possible using micrometer calibrated to tenths of one thousandth of an inch...

GMC Cars &... | Answered on May 15, 2020


UNDER HOOD IN FUSE BLOCK ON TOP OF LEFT FENDER

GMC Cars &... | Answered on May 15, 2020


Depends on how hot and how long it was running without coolant. Let the engine cool down. Then add water to the radiator, start the engine, check the water level and keep adding water until it is full. Make sure that the serpentine belt is ok. Check to see if there are and large coolant leaks. If the engine has a miss or is blowing out white smoke from the exhaust pipe then damage has been done. If everything seems ok, then let the engine cool down again and recheck the coolant level. Make sure that the serpentine belt is ok.

GMC Cars &... | Answered on May 14, 2020


https://www.youtube.com/watch?v=mU6o7aAInVo

https://www.engine-codes.com/search/co223?__cf_chl_jschl_tk__=975a68e62152a290788c3fbda4a77450b224f272-1589394049-0-AYOcR8KKAAE38gGiTNpgSI0k7uctIG3tsfukvX5EJkniq9zuFTfxWIlds9HxFl3N2-JC2Gmgf62JQh1kHY86PTomZVo1WJw280ukmGkOcLlRb6nO2apcYHApY09aJ4DdlMpfdh7R0XZkVxi5Q1iHwSYc45tQStfT2lfyyPCWy0dXb4SmIDZxlcEuB5Oh5Zol92yFaVqKAwqqpJQUhZJ-pvnNkjASz9Acsd1JmCsqyHfX7RYwRHFdyU_RXJFQC0xJeYNj6wA4iaEVAdsBydQlp42dPCyN5c35Dw_h8Cy3N2Wp

GMC Cars &... | Answered on May 13, 2020


INJ 2 fuse 15 amp supply's battery power to the coil

GMC Cars &... | Answered on May 10, 2020

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