GMC Cars & Trucks - Recent Questions, Troubleshooting & Support

If possible, pull the horn relay, use jumper wire on switch side of relay, right side in diagram. If the horn sounds, it's not the fuse. Sometimes these diagrams don't post, for some reason? good luck horn-undefined-undefined-0_0.jpg

GMC Cars &... • Answered 23 hours ago

Why are you needing the VATS module? If you are trying to bypass the VAST system, you only need the two wires at the base of the column that run to the ignition exciter ring.

1999 GMC Sierra • Answered 3 days ago

Pump replacement is fairly involved, but the issue is rarely the pump, as it is pretty indestructable. If you have low pressure, usually some clearances are too loose, somewhere. There is also sending unit issues, so measure your pressure with an external "known good" gauge.

2004 GMC Envoy • Answered on May 05, 2021

Do you live in a dusty area? My sister lives in dusty New Mexico and had a malfunctioning XUV tailgate. My reasoning was that something must tell the tailgate not to drop down if the glass is up, and if it can't tell, then it will only open sideways.
So we removed the trim panel, and the tailgate was indeed full of dust. By reaching my arm in, I found two plastic optical sensors which tell the gate whether the glass is up or down; both were coated with dust. After cleaning these the tailgate was back to its normal operation. The two sensors are flat, round - about the size of a nickel or dime...I couldn't see them, just found them by guessing that they must be there. Hope this helps!

2004 GMC Envoy • Answered on Apr 23, 2021

Fuel Pump Flow Control Module (LLT) Mounted under the rear of the vehicle, rear of the fuel tank

2009 GMC Acadia • Answered on Apr 22, 2021

You mean the brake line flare nuts on the end of the lines? I see nothing that looks like a 'plug'. You buy the lines ready made or you have them made a garage, using a brake line flare tool set. eBay sells them ready made.

2006 GMC Canyon • Answered on Apr 20, 2021

Certain things wont operate. Buy a haynes repair book at parts for testing fuses&relays

1997 GMC Jimmy • Answered on Apr 20, 2021

GMC and Chevy has issues with the dash controls on 4WD models

1998 GMC Jimmy • Answered on Apr 20, 2021

Call the dealer with the vin number and they can give you exact spec's

2001 GMC Jimmy • Answered on Apr 20, 2021

If you could be more specific on which pulley was sparking I could help more accurately

1998 GMC Jimmy • Answered on Apr 20, 2021

Have the fuel pressure check and make sure it's within specifications....... sounds to me it is too low pressure

1998 GMC Jimmy • Answered on Apr 20, 2021

Are you sure it's a "no spark" condition? might be fuel?

1987 GMC Jimmy • Answered on Apr 20, 2021

Usually in the cowl vent closer to the passenger side

1994 GMC Jimmy • Answered on Apr 20, 2021

i have had same problems i can turn key on radio works and everything else i have found that problem with mine to be a short ground out from the main power lead from the battery to the starter that was shorting it out until i moved it around and found it

1996 GMC Sonoma • Answered on Apr 18, 2021

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