GMC Sierra 3500 HD Repair and Maintenance
A guide to problems, costs, maintenance and repair for your GMC Sierra 3500 HD
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GMC Sierra 3500 HD ProblemsReduced Power and Check Engine Light
The GMC Sierra 3500 HD uses a throttle position sensor (TPS) which commonly fails and causes:
- Check engine light illumination
- Reduced Power message
- OBD trouble code P2135
This issue is related to the throttle position sensor, and can be caused by faulty wiring to the TPS, bad connection at the TPS, or a failed TPS.
To correct this issue, the wiring harness, connector, and throttle position sensor must be inspected, tested, and/or replaced. The most common cause is a faulty TPS.
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time.
GMC Sierra 3500 HD QuestionsI pull a 16000 lb rv and it keeps overheating on me going up hills or passes (1 answer)
pulling it up like a 6% grade it will overheat and I have to pull over and let it cool down??
when docking trailer, low revving and slow moving steering becomes non-power. Brakes are quite often "soft" even when steering seems fine. Mechanic says rotors are fissured and needs new pads. Pump is leaking. Is this a Hydroboost thing or just steering pump. Is $3400.00 a reasonable pr...
Tech 2 code listed injection pump? Hoping it's only a Injection valve replacement?
GMC Sierra 3500 HD RecallsPassenger Frontal Air Bag Inflator Ruptures On Deployment
The passenger frontal air bag inflator may rupture on deployment, causing metal fragments to come through the air bag and injure occupants. Dealers will replace the passenger frontal air bag inflator free of charge to resolve the concern.
The brake pedal may loosen and fail to operate properly, due to the loosening of a pivot nut. Dealers will inspect the brake pedal pivot nuts and add thread adhesive, tightening the nut as necessary free of charge to resolve the concern.
In a crash that deploys the passenger front air bag, the inflator of the air bag can rupture, causing metal debris to strike vehicle occupants. Dealers will replace the front passenger air bag inflator free of charge to correct the concern.