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Prev Professional Automotive Repair Technical Discussions for January 30, 2015
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Open Help Requests for GM
Help Request Answers
2002 Buick Century Custom 3.1L No Start VIN: 1G4WS52J02
got a real hair puller here.i no I must be missing came in 2 days ago on the hook.of coarse it started right up for me,drove in shop.check codes and only thing in there is p0463 fuel level circuit.gas gauge reading erratic also.gave him a estimat... Trouble codes: B2958 (p1626-), P1626 (p0463-), P0463
1998 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCCS19X7W
The vehicle won't see the desired EGR value when we were doing EGR functional test. It shows the EGR actual value but not the desired value. We put a new EGR valve, we checked the wiring, wiring is ok. We have 5-bolt reference and the grounds are ok. We even r... Trouble codes: P0404
2005 Chevrolet Silverado 1500 5.3L MIL Lamp on, reduced power VIN: 1GCEK19B95
customer complaint of reduce power message comes on and he looses all acceleration. Customer will turn off vehicle and sometimes loosens gas cap to get the message off where he can drive again. Don't know what loosening the gas cap has anything to do with this... Trouble codes: P1516, U0107
2007 Chevrolet Trailblazer LT 4.2L Instrument Cluster VIN: 1GNDT13S67
When driving this vehicle down the road all the gages drop down to zero except the speedometer and the tack. The windows do not work, the locks also refuse to work, and then suddenly everything starts to work again. These are the codes that show up; U1000 ...
2007 Chevrolet Malibu LS 2.2L fuel guage VIN: 1G1ZS57F87
this vehicle was brought in by used car lot.when ign turned on speedometer needle quivers for about 4 seconds stops quivering and gas gauge goes to 3/4.turn key off to exit vehicle speedo needle quivers for a few seconds and stops quivering.they put a fuel sen...
2009 Chevrolet Aveo5 LS 1.6L Engine Control VIN: KL1TD66E19
This vehicle came to us with a failed engine. Replace the Engine with low mileage salvage yard unit. Vehicle will not idle or accelerate. We replaced the fuel pump for possible volume issue still not change. Inspected all of the engine harness, swapped old par...
2006 GMC Envoy Denali 5.3L #7 compression VIN: 1GKET63M76
This envoy came in with the customer concern of oil light coming on at times, ticking noise, and running rough. Got in vehicle and oil light was not on but it was misfiring. Checked Engine oil level and it was clean and full(customer is good about doing regula...
2001 Pontiac Aztek 3.4L Cooling fans VIN: 3G7DA03E81
Seconds after vehicle start fans are commanded on low, then high. Stay running on high for 5-10 mins, turn off, then back to high. Sometimes while driving they will turn off for several minutes, can't establish any pattern. Haven't seen any significant changes...

Fixes & Summaries for GM
Fix/Summary Answers
1976 Cadillac Eldorado 8.2L turn signal switch
Thanks for the late night advice. I just couldn't believe what a hassle this was. Several of you were dead on and some others not so much. The arm(metal, no sleeve) screwed in from the side. That was apparent. What I couldn't believe was that I had to scr...
2006 Chevrolet Silverado 1500 LT 5.3L Left Front Seat VIN: 2GCEC13T16
Many thanks to all tech who reply my post. Yes, the culprit is a burnt element on the driver side back cushion, the bottom seat element is still good, 3.7 ohms. Special thanks to Tom from California who explain in detail, how it works. Now the problem is solv...
2005 GMC Sierra 1500 SLE 5.3L actuators VIN: 2GTEK13T55
Finally found it. When i drilled the plastic welds off the HVAC case to get it open the drill hit one of the wires to the mode door actuator. Had continuity from module to actuator but 2 wires were shorted together which i did not check for. Fixed that and the...
2008 GMC Acadia SLT 3.6L MIL Lamp on VIN: 1GKER23768
Vacuum port lost cap. I initially went on shop owners assurance that a check for vacuum leaks was confirmed. I popped in his shop this morning to check something else I had a theory on and thought I could hear something from the front left that faces the fir... Trouble codes: 171 (174 -), 174 (testing and results).
2009 GMC Acadia SLT 3.6L Electronic VIN: 1GKER23DX9
Replaced brake pedal position sensor and recalibration through the BCM. No more DTC and brake lights operating properly. The EBCM receives the brake signal from the BCM.
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