GMC Cars & Trucks - Recent Questions, Troubleshooting & Support


Flat battery?
Anti-Theft system activated?

GMC Cars &... | Answered Yesterday


Hello James,
It sounds like either you have a blown fuse or relay under the hood. Or it may be your keyfob. With the Interior lights and the liftgate not working. I want to say it may be a fuse. Have you hooked anything new upon the vehicle? If so you might have shorted something out. Have you recently put a receiver hitch on it? If so there is a possibility you could have got your wires pinched in it, or you may have lost a ground wire somewhere in your wiring. I'm sure you have probably already checked your fuses, but did you check both boxes? The one under the hood and the one under the dash? Check them and go from there to your wiring and check your battery in your Fob. You can make sure your fob hasn't messed up by taking it to someone with the right scan tool and reprogram it to your vehicle. Try that and see what you come up with.

GMC Cars &... | Answered 3 days ago


Yes, a inoperable relay will cause a turn signal failure. But it isnt the only reason. If you need more information please write back. If you do, please write back with specific details about the issue and what you have done and tried so far. Good luck.

GMC Cars &... | Answered 3 days ago


You should have a fuse box located to the left of the steering column by your left knee. If it's not there open your drivers door all the way and see if the panel on the end of your dash doesn't remove giving access to it. Most all GMs are there or under the dash by your left knee. Relays are a couple places. The main relay box should be under the hood on the drivers side. On or close to the inner fender well. But the ones for the blower motor are usually located behind the glove box on the ********* housing where the Heater & A/C cores are located.
Hope this helps you.

GMC Cars &... | Answered 3 days ago


Normally this should be under the steering column, on the fuse box

GMC Cars &... | Answered 3 days ago


Replace the blower motor resistor located in the blower housing under the dash on the passenger side and you will be good to go.


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2001 GMC Yukon... | Answered on Dec 07, 2019


Sorry Joseph but the way you worded that makes no sense to me.

GMC Cars &... | Answered on Dec 07, 2019


Modules communicate back and forth on the CAN bus. Code U0100 indicates the PCM is not able to send or receive CAN communication signals. This should be diagnosed by a professional.
Possible causes:
  • A faulty PCM
  • A problem with the control module circuit
  • A problem with the CAN bus

GMC Cars &... | Answered on Dec 07, 2019


2.2L DOHC Interference
2.2L SOHC Non-Interference

GMC Cars &... | Answered on Dec 06, 2019


Does the engine Crank but not Start or no Crank? If the engine light is on I need you to read the codes or have them read. If there is a stored code it could be very helpful. There are many reasons for a No Start. Please start here and write back. Just in case you wanted some examples. Blown Fuse, Low Fuel Pressure, Low Compression, MAF sensor, fouled spark plugs, CKP sensor or ignition control module. Hope this helps. Let me know if there is anything else. Good luck.

GMC Cars &... | Answered on Dec 04, 2019


check that you have a good solid Ground connection at that light housing and bulb socket.

1999 GMC Sierra | Answered on Dec 03, 2019


Fuel Filter
The fuel filter is contained in the fuel sender assembly inside the fuel tank. The paper filter element of the fuel filter traps particles in the fuel that may damage the fuel injection system. The fuel filter housing is made to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. There is no service interval for fuel filter replacement.

GMC Cars &... | Answered on Dec 02, 2019


The sensor or it's wiring are bad . Check for corossion or wire damage first . Mass air flow sensors are most affordable through Rock Auto online .

GMC Cars &... | Answered on Dec 01, 2019


Try putting some fuel in. That should start your vehicle.

1999 GMC Jimmy | Answered on Nov 30, 2019


How exactly is it 'jammed'? Is it wide open? Locked closed? stuck half way? Please use the Comment button below if you would like more help.
Go back to the basics. Check the fuse for the motor and you that you can here the motor trying move it. With the ignition OFF and safely using step ladders access the sunroof from above. Using a stiff toothbrush, cotton buds, (cue tips), and a clean rag, clean out the channels the sunroof sits in.
if you are in any doubt go to a good mechanic or a good auto-electrician and get them to look at the problem.

GMC Cars &... | Answered on Nov 30, 2019


The transmission needs inputs from the sensors on the engine, like the manifold pressure sensor, throttle position sensor, temperature sensor and others to function correctly .

GMC Cars &... | Answered on Nov 29, 2019


Can be three things

check fuse

check bulbs

check the brake light switch

GMC Cars &... | Answered on Nov 29, 2019

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