2000 GMC 3500 Pickup Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2000 GMC 3500 Pickup

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2000 GMC 3500 Pickup Problems

Instrument Panel Lights Flickering and Exterior Lights Intermittent

The headlight switch used on the GMC Sierra 3500 is known to fail through normal operation. Since the headlight switch is also integrated into the interior lights, a malfunctioning switch can cause issues with interior lights as well.

  • Symptoms of a failed headlight switch include:
  • Headlights and taillights failing to turn on or off
  • Interior lights flicker, or fail to turn on or off
  • Gauge cluster lighting off or flickering with headlights on
  • Parking light malfunctions  

This issue is well known with General Motors Trucks and SUVs, and is solved by testing and, if needed, replacing the headlight/dimmer switch. Bad grounding wires at the tail-lights, and dirty/corroded tow package wires can also lead to some of these issues. 

Check Engine Light Due to Gas Cap Issue

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

Replace spark plugs every 100,000 miles

The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time.

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2000 GMC 3500 Pickup Questions

what causes the 4 wheel drive actuator to not engage the differential? (1 answer)

I put in an actuator that I know is good, that one does not extend either, the transfer case shifts into 4 wheel drive and will spin the front drive shaft but the differential will not lock in. I am curious if there is a common wiring issue or if someone knows how much power should be at the fron...

First, my truck is not a "Pickup", it is a GMC 3500 HD Commercial Box Truck. (1 answer)

My truck (as listed above), would not start, even though it had power. Check Starter, relays, and fuses. Replaced Starter, still the same, checked fuses again, no fuse listed 'Starter" but found one listed "Crank", it was blown, I replaced it (10 amp), truck started as usual, ...

l/s headlamp not working. replaced w/ new one,still not working. (2 answers)

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