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Prev Professional Automotive Repair Technical Discussions for May 8, 2013
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue 3.8L engine missfire VIN: 1G4CW52K6S
after look at car recommended replace fuel filter and PCV and clean very dirty MAF car started rough then smoothed out took out for test drive stumbled on take off then suddenly ran great returned car to customer 2 hours later customer call and said the car do...
1994 Chevrolet Commercial Chassis 5.7L 3-4 Shift VIN: 1G1BL52P6R
Car shifts from first to second, second to third and will not shift to fourth.when taking off the car takes off in 3rd gear.bring car back to shop shut it off let it sit for several minutes and it seems to clear itself until it goes through the gears.scanned f...
2001 Chevrolet Silverado 2500 HD 6.6L Transmission VIN: 1GCHK23131
Thank you to all who read this. I have a customers truck here that clunks and jerks like it got rear ended just after a hard stop. if you accelerate up to 15 mph or so and stop quickly about 2-3 second later the trans clunks and jerks forward. I noticed in sca...
2001 Chevrolet Express 1500 5.0L Misfire VIN: 1GCFG15M01
hello techs,have a 2001 chevy express 1500 5.0 has codes p1381 and po300 when customer brought it to me it was a no start it had a bad distributor cap had some condensation in it, found tsb,cleaned distributor vents, where ok,customer supplied cap,then called ... Trouble codes: P1381, P0300
2003 Chevrolet Silverado 3500 6.6L fuel in crankcase VIN: 1GCJK39133
Truck came in with a complaint of low to no oil pressure. Oil was thinned out and 14 quarts overfull. Diesel fuel is mixed into the crankcase. I had codes p0522 ops ckt low, p1093 fuel psi low while power enrich and p1094 fuel rail low while idle or fuel cut. ... Trouble codes: P0522, P1093, P1094
2004 Chevrolet Suburban 1500 LS 5.3L Radio VIN: 3GNFK16Z04
Good Afternoon, I have this Surburban in my bay that came in with a cd changer that would intermittenly quit reading the cds. I replaced it with a rebuilt player from my local GM dealer and programmed it with Gms SPS through my Tech II. The programming was suc...
2008 Chevrolet Equinox LS 3.4L emissions VIN: 2CNDL23F68
This vehicle will not run the O2 and EGR monitors. We have driven the vehicle close to 800 miles and followed the GM drive cycle to the tee over and over with no luck. We replaced the thermostst because it was a bit slow to reach operating temperature but this...
2003 GMC Envoy XL SLT 4.2L MIL Lamp on VIN: 1GKDT13S43
this vehicle has intermittent problem reduced power lite comes on no odometer or park position lites on dash no communication with transfer case had multiple codes u1000 state of health message trottle body codes coolant temp below operating treshhold Trouble codes: U1000
2007 GMC Yukon XL 1500 Denali 6.2L MIL Lamp on VIN: 1GKFK66857
Fellow techs. We are in this one deep and need some help. The vehicle came in with the trans in limp in mode. Check engine light on, brake and abs light on, service stability light on. Gauges will fluctuate also. We checked the connector at trans and is ok. We... Trouble codes: U0073 (no communication with ecm), U0121 (no communication with trans)
2002 Pontiac Firebird 3.8L Hesitation, Cuts out, Stall, Misfire VIN: 2G2FS22K92
Vehicle came in with a misfire on acceleration intermitantly, no codes. Drove vehicle felt the misfire like it was an ignition misfire had my scanner hooked up and lost communication while viewing the misfire monitors and then it would communicate again and ru...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac CTS 3.2L MIL Lamp on
finaly got car back rescanned and found throttle body codes replaced and all is good thanks for your responses Trouble codes: P1904.
1991 Chevrolet Camaro RS 3.1L No Start, Stall, MIL Lamp on VIN: 1G1FP33T9M
With head hung low, I limp across the finish line. Problem was indeed an injector with low (4 ohms vs 12 ohm spec). These are not sequential injected systems. They're based on the old Bosch L Jetronic fuel injected systems with gang-fired injectors. In this ca... Trouble codes: 46 (Vehicle security system).
2002 Chevrolet Silverado 1500 5.3L radio VIN: 2GCEK19T42
pulled radio one weekend to check ...and many thanks on O2 info printed and will keep in the folder ive accumulated over the years
2003 Chevrolet Venture LS 3.4L MIL Lamp on VIN: 1GNDX03E93
first off. thanks for everyone taking their time to respond. i double checked all of the wiring associated with the module and all was good. i replaced the ignition module and test drove no more p1374 so far. im gonna call this one fixed. thanks again for yo... Trouble codes: P1374.
2005 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC12FS5
Most replies suggested a bad PCM. Others said possible damaged wiring either from mice or shorted from transmission. I had already checked all wiring twice. The local junkyard had plenty of these so I tried a used PCM. Had to do the crank and wait until the se... Trouble codes: P0122 (TPS circuit A low voltage).
2006 Chevrolet Malibu LT 2.2L thermostat VIN: 1G1ZT51F86
Thanks to all for the replies! The help was greatly appreciated. Well, GM e-mailed a survey to me about my service experience. I didn't let the opportunity to vent pass. So yesterday I got a call from GM, they are re-opening my case, so fingers crossed. I will...
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