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Prev Professional Automotive Repair Technical Discussions for July 20, 2012
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Open Help Requests for GM
Help Request Answers
2001 Cadillac Eldorado ETC 4.6L No Start, No crank VIN: 1G6ET12951
First,thanks in advance for your time and any assistance. This vehicle came from a used car dealer. This beast was presented to us as a no crank concern. We were told that up until that point it was running fine and had been for a couple of weeks after having ... Trouble codes: U1000 (u1255-), U1255
2008 Cadillac CTS 3.6L MIL Lamp on VIN: 1G6DP57V98
this car camer in with the p0100 code. cheched the connector have power, ground, 5 volt reference. all test all data tells you to do except for the test with the factory scan tool because i dont have one. everytyhing was pointing to the maf sensor. replaced th... Trouble codes: P0100
1995 Chevrolet C2500 Suburban 7.4L Excessive Emissions VIN: 1GNGK26N0S
Need help guys. Car failed asm dyno smog test for nox. Linear egr can be commanded via scan tool on and off and will stall engine. During asm test, egr valve can be commanded to 75% and nox readings go from 1300-1500 to 100ppm. This tells me that ecm is not co...
1999 Chevrolet Express 2500 5.0L Sdm VIN: 1GCFG25M4X
Presented to us with b 1071, SDM module internal failure data shows no short or open (4.6 ohms on both bag circuits) Information I need is, Is this module on this year vehicle a plug and play? dealer says it needs to be programmed. I had done this same job i...
2000 Chevrolet Astro 4.3L Cuts out, Stall, Misfire VIN: 1GNDM19W8Y
intermittany stumbles or missfires on take off. rarly stall replaced map sensor, back probed wires, good 5v ref while acting up, signal wire reades within 1-3 mv when acting up, gnd .02 voltage drop while acting up. codes only rey\turn when van stumbles/missfi... Trouble codes: P0107, P1107
2001 Chevrolet Malibu 3.1L Poor Idle Quality, Surge, High Idle VIN: 1G1ND52J71
Thank you to everyone who responds. So a friend of mine brings in his Malibu and it is idling fine. tells me that he took it on about a half hour drive and was using cruise and when he got to the town the idle on the car was high and he had to ride the brakes ... Trouble codes: P0122, P1122
2005 Chevrolet Silverado 1500 4.8L actuator VIN: 1GCEC19V75
rh vents go to heat intermittingly
2009 Chevrolet Cobalt LT 2.2L MIL Lamp on VIN: 1G1AT58H89
oil in cooling system, moisture in oil, add dye head crack between cylinders #3 #4, replace cylinder head, have code P0016, P0017, any wave forms for crank and cam senosr correlation? Trouble codes: P0016 (ckp-cmp correlation), P0017 (ckkp to exhuaust cmp correlation)
2010 Chevrolet HHR LT Panel 2.2L No Start VIN: 3GNBABDB6A
Found codes listed. Could not communicate with ABS module with Tech 2. Unplugged ABS Module and car started. We believed the ABS module was bad grounding the high speed lan so replace module and reprogramed. Car towed back in same problem. Same codes. If we cl... Trouble codes: B1370 (SDM Modul Device Ignition 1), B0090 (SDM Rollover Sensor), B0081 (SDM Passenger Presence System), U2108 (Lost communication with ABS Module)
2004 GMC Sierra 2500 HD 6.0L fuel gauge VIN: 1GTHK23U74
Hey guys i need some help on this one. This truck came in about a month ago with the owner saying the fuel gauge was not reading right sometimes. I pulled a p0462 fuel level sensor problem but the check engine light was not on. I could not duplicate the proble...
2005 Pontiac GTO 6.0L Ignition VIN: 6G2VX12U05
Here is how it all went finished the motor built from shortblock customer ran it out of oil. Primed the oil good pressurre stuck the motor in the car cranked and cranked it it no start... pulled codes got a P0335 for curcuit A looked over at my bench saw the c...
2008 Saturn Vue XE 3.5L extended crank VIN: 3GSDL43NX8
vehicle came in with extended crank and occasional misfire; tested fuel pressure at test port and observed pressure drop from specified value koeo. Assumed check valve (part of fpm) was bad so replaced fuel pump module. Upon restart after replacement, same res...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Cadillac DeVille 4.6L Misfire VIN: 1G6KD54Y15
Hello all and thanks for the advice, well I didn't get this one fixed as the customer wished to take it as is. Almost everyone said blown head gasket, but it was full of coolant and held pressure overnight, and the customer had recently took a trip with the ca... Trouble codes: P0300.
2000 GMC Safari SL 4.3L Hesitation, Surge, Misfire VIN: 1GKEL19W5Y
Thanks for all the replies. Replaced the fuel pump with a Delphi unit and it's fixed. These Safari's are very sensitive to fuel pressure. As soon as it dropped to 55 psi at wot it started losing power. Now the pressure stays above 60 at wot. Also cam retard is...
2003 Oldsmobile Alero GL 2.2L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1G3NL52F13
Thanks for all the help the timing chain jumped time on the exhaust cam. Trouble codes: 300 (Missfire).
2005 Pontiac Vibe 1.8L wheel bearing VIN: 5Y2SL638X5
well this car is fixed! talked with customer about any accidents and he said yes a couple years ago rt frt. so when pressing apart noticed that the bearing housing was cracked. so checked knuckle with dial indicator to find a section that was out 1mm repla...
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