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Prev Professional Automotive Repair Technical Discussions for January 30, 2014
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
2006 Buick Terraza CX 3.5L Abs/Tac VIN: 5GADV23L86
Got a debacle here. on the dash (IP) I see: red brake light, ABS light amber, T/C (traction control inop). Also the message center on the IP reads these messages: service ABS, service traction system, service brakes, service stability system. so I started with...
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2001 Chevrolet Express 3500 5.7L Hesitation VIN: 1GCHG35R91
Hello i have a chevy 3500 express van under acceleration the transmission down shifts speedometer sweeps to 0 as soon as you let off the gas the seedometer comes back. We checked the speed sensor. With scanner while driving sensor ok reading right. The only co... Trouble codes: C0037 (Trans/abs code)
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2006 Chevrolet Silverado 1500 LT 5.3L brake feel VIN: 2GCEK13T66
Bought this truck a few months ago all was well till this morning. Brakes were working fine except for one time only. That one time at less than 10mph the pedal was at normal height then dropped a 1/2 inch, held and came to a stop. The rest of the time was fin...
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2007 Chevrolet Malibu LT 3.5L MIL Lamp on VIN: 1G1ZT58N27
freeze frame data shows sft2 16 lft2 20.It takes about 25 miles to set failure.Performed injector flow test,all injectors within 1 psi.I wanted to know if the problem was in the engine or pcm-wiring.Hooked up jumper leads to make bank 1 read off bank 2 sensor ... Trouble codes: P0174, C0561
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2008 Chevrolet Cobalt LT 2.2L parking lights VIN: 1G1AL58F58
The vehicle came in with the park and dash lamps inoperative. Replace fuse and after approx. ten minutes of engine run time, the fuse blows. If the car isn't started, the fuse does not blow. Interior, DRL, headlamps, radio, heater control, and trunk lamps all ...
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1999 GMC C3500 Sierra SL 7.4L Hydro-Boost VIN: 1GDKC34J7X
This truck is equipped with hydro-boost system, p/s system feel normal , truck has good braking, preliminary check normal.customer mentioned p/s wheel felt hard at some point, feels ok now,brake pedal kicks back when applied every time it is applied.brake pads...
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2000 GMC C3500 Sierra SL 6.5L MIL Lamp on VIN: 1GDJC34F1Y
Hello, I am working on a 2000 GMC C3500 with a 6.5 liter turbo diesel. The vehicle first came in with a crank no start condition. Customer tried to self diagnose and found that there was fuel at the injection pump inlet but no fuel at the injectors. He did s... Trouble codes: P0251 (Injection Pump CAM System), P0370 (Timing Reference High Resolution System Performance)
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2001 GMC Sierra 1500 SL 5.3L Poor Idle Quality VIN: 1GTEK19T61
Hi techs, I have been going in circles on this job .Can not seem to pinpoint the problem. Truck came in with Hi idle and intake leaks. Both banks running lean trims. Also had a higher than normal idle when cold, settled down after 30 seconds but still higher t...
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2003 GMC C4500 Topkick C4C042 6.6L Cuts out VIN: 1GDE4E1103
This truck will start and run for appx 5-10 minutes, then just shut off like you turned the key off. No warning, no surging, just from idle to off. The only way to restart it is to manually pump / prime the fuel system again under the hood, but that will only ... Trouble codes: P0540 (Intakr air temp)
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2004 GMC Yukon SLT 5.3L Surge, runaway idle
get app 1&2 codes, tps 1&2 codes Tried known good throttle body and accelerator assemblies. Tried stabilant 22, tried known good tach module. Trouble codes: P2120, P2125
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2007 Hummer H3 3.7L chime VIN: 5GTDN13E57
Since bcm replacement warning chime is extremely loud even on its lowest setting. Literaly Hurt your ears loud. Incedently to adjust the volume setting You have to turn it up to make it quieter. Also cannot bring up additional menus during personalization. Sus...
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2004 Pontiac Grand Prix GTP 3.8L Engine/ignition VIN: 2G2WR52464
Hi GM Techs, hope you can help with this one. This vehicle came to us with a serious knock from the engine. By the time the vehicle was unloaded off a car hauler, the noise had quieted down considerably. We started the car cold & it did knock. It sounds deeper...
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Fixes & Summaries for GM
Fix/Summary Answers
2001 Cadillac Eldorado ETC 4.6L No Start VIN: 1G6ET129X1
Repaired with factory injectors. Having the original injectors rebuilt was no good. Thanks for all the feedback
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2000 Chevrolet Silverado 1500 5.3L ignition VIN: 2GCEK19TXY
thanks for all the replies.ended up being the ignition switch.voltage was dropping out to the coils in cranking.thanks again!!!
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2001 Chevrolet Silverado 3500 LS 8.1L Lack of power VIN: 3GBKC34G11
.A FUEL PROBLEM WOULD HAVE SHOWN UP ON THE FUEL TRIMS , AS WOULD RESTRICTED CATS,TRIMS WERE GOOD, THE MAP READING I GAVE WAS CORRECT AND GOOD 30IN. KOEO. MINUS 20IN. OF VACUUM = A MAP PID. OF 10IN KOER. AND tps, maf,baro,rpm,engine load,all mirror each other ...
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2002 Chevrolet Trailblazer LS 4.2L oil pressure VIN: 1GNDT13S52
Changed oil and filter and pressure overall stayed more stable but have no idea if pressure is correct. While I'll agree with everyones ideas, any proposition of opening up this engine with 241 K on for an inspection was to high a price to pay. The oil pan re...
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2004 Chevrolet Silverado 2500 HD 6.6L Misfire, Poor Fuel Economy VIN: 1GCHK23134
well guys thanks for all you help.It turns out that the cp3 pump was the culptrit.I learned a couple of things on this one.I learned that you could see the pump shaft through the filler hole and learned that that one in a million problem could land on anyone.t...
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2008 GMC Yukon Denali 6.2L Park Lights VIN: 1GKFK63808
OK, it's fixed. after sorting out the differences between the Mitchell wiring diagrams and the pin number and locations on the relay, truck had erratic readings of low voltage to no connection on the control wire to the BCM. Traced this wire back and found sho...
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