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Prev Professional Automotive Repair Technical Discussions for July 2, 2009
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Open Help Requests for GM
Help Request Answers
1993 Cadillac Eldorado Touring 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6EL1299P
Hey guys, Customer came in with a high idle problem all the time. Scanned for codes. DTC P030 - Idle speed control RPM out of range. Engine idles at approx. 1,500RPM all the time. Checked for binding cables, throttle etc, and found plunger on ISC motor fully e... Trouble codes: P0030
1992 Chevrolet S10 2.5L Hesitation, Cuts out, MIL Lamp on VIN: 1GBCS10A7P
This is a Chevy s-10 2wd mail truck. Truck came in last week for running poor. The other tech changed the Fuel Pump due to low pressure, problem fixed. Truck came in today for running poor under load. Checked Fuel Pressure, found it to be good. Wasnt sure of i... Trouble codes: 44 (lean)
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L abs VIN: 1G1YY23P7P
Hi guys this is car has an ABS false activation. The system has ASR. When I'm in the car hitting the gas and not moving the rear end I hear a buzzing noise. Scan tool hook up found the Left Front ABS speed sensor moving up and about 1 to 9 MPH just giving it g...
1995 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 1GCEK19K7S
this truck starts up fine for a few seconds then just dies. i have replaced everything. i have tried 2 different known good ecm's but have come up with nothing. i have good fuel volume and pressure. any help would be appreciated. thanks.
2003 Chevrolet Silverado 1500 4.3L Warning lamp VIN: 1GCEC14X63
Hello all. I have a 2003 Chev. here that's driving me crazy! First of all the customer drove it completely dry of brake fluid!!! I found that the front two lines that run from the ABS module to the front calipers were leaking. After checking on the lines runni...
2005 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13T55
Have this 05 tahoe from body shop. will not start cranks over fine. They drove it into bays then did body work now will not run. truck hit left frt corner. I have a U1000 code always current in IPC, BCM, SIR, ABS, ONstar, ACM. All other modules no codes. I rep... Trouble codes: U1000
2006 Chevrolet Cobalt LS 2.2L Cuts out, Stall VIN: 1G1AK15F66
Hello again and help from the GM gurus... This cobalt intermittantly stalls on acceleration. It has happened to the customer 3 times. All 3 times it was on acceleration from a dead stop and when turning left. IE : stopped in turning lane waiting for hole in tr... Trouble codes: P0128, P0106, P0300
2003 GMC Envoy SLT 4.2L MIL Lamp on VIN: 1GKDT13S73
this envoy is entering reduced engine power mode when the mil comes on with codes p1221 p1271 and p1481. the code can be cleared and normal engine operation will resume for up to a couple of days. vehicle will also intermtitently cruise at 40mph. without accel... Trouble codes: P1221, P1271, P1481
2005 GMC Sierra 2500 HD SLE 6.6L No Start VIN: 1GTHK23235
Greetings. I have a 2005 GMC Seirra 2500HD that doesnt start. There is no fuel pump relay command tested directly off the ECM. I tried jumping the relay and the truck started... Twice... After that, nothing. There is no ECM communication with the scanner. When...
2000 Oldsmobile Intrigue GLS 3.5L engine VIN: 1G3WX52H4Y
This car has been different to diagnose. It only overheats at highway speeds in overdrive and lockup. If you raise the RPM to 3000 or more it will cool back down. There are no gases present in the coolant. We are the third shop to inherit this problem child. T...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Century Custom 3.1L odometer VIN: 2G4W552M6X
Thanks to all 15 techs who answered this question. Nearly all agreed that this problem was a bad component or a bad solder joint in the instrument cluster. I googled "Buick instrument cluster repair" and came up with several shops that can repair this. The ...
2001 Buick Century Limited 3.1L Odometer,shift indicator VIN: 2G4WY55J81
Hello everyone and thank you all very much. I took the first reply to my question(Jamey)and opened the cluster up to find exactly what he said. Two of the 4 resistors were missing. I then opened the used cluster up to find 3 of those missing! I was going to ro...
1992 Cadillac DeVille 4.9L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G6CD53B9N
Thank You and Thank You. You guys are awesome. This Cad. fixed. First I double check all the grounds including the one next to the starter. I even removed the bolt and clean. I also check the wire the go around the firewall all look normal. Oh I forgot t... Trouble codes: 71 (intermittent manifold absolute pressure), 52 (Electronic Control module reset).
1997 Chevrolet K2500 Cheyenne 6.5L Poor Idle Quality, Cuts out VIN: 1GCGK29F4V
We had to bring the Truck to a shop specialized in Diesel repair. Unfortunately none of the above mentioned leads we followed worked out. We did purchase a relocating kit for the pump module, but the result was the same. The manual injection timing adaptation ... Trouble codes: P0216 (Injection timing control circuit), P1214 (Injection pump offset), P0236 (TC boost system).
2001 Chevrolet Venture LS 3.4L picks upspeed VIN: 1GNDX03E51
Sorry it took so long to reply back with fix. Car just came back in with ses light on, code for tps. Changed tps all good now. The spring was broken in sensor witch was not keeping tension on it. Thanks for all the replies.
2006 Chevrolet Cobalt SS 2.0L rough shifting 1st speed VIN: 1G1AP14P46
We changed the transmission oil for the quaker state Synchromesh which is equivalent to GM [...] for manual transaxles. and after driving the car for a small period of time it is shifting smoother again like before thanks for your time and help ...
1999 GMC C3500 Sierra SL 6.5L No Start VIN: 1GDKC34FEX
wooo hooooo thanks to every one who replied . vehcle theft deterent was cutting off fuel to the injectors. the fix was to leave key on until security light goes off than turn ignition key off then on 3 times. only then was i able to prime the pump . thank you ... Trouble codes: P0335, P1631.
1999 GMC Savana 1500 5.7L 3-2 shift VIN: 1GDFG15R0X
well thanks for the replies,it ended up being a defective pcm that was a delco re-man. I was leary about it but was able to get a tranex box & confirmed the trans was good & I knew the wiring was good after triple checking it all. its a good feeling having th...
2002 Pontiac Grand Am SE 2.2L water pump VIN: 1G2NE52F33
Thanks to the overnight reply from John [...] , the fix was to remove the timing cover and reset the balancer timing chain tensioner. The tool failed to keep the chain tight enough to avoid the tensioner from expanding and over tightening the chain. the tool ...
2002 Pontiac Grand Prix GT 3.8L Starting VIN: 1G2WP52K42
For what ever reason, the new security module went bad. There was a visible spot on the module where it fried. Replaced it with a new one and the car started right up without any problems. Unsure at this point if it was just a bad OE part or if other gremlin...
2005 Saturn Ion-1 2.2L Power steering VIN: 1G8AJ52585
couldn't fix this one guys customer needs the car. many of the guys pointed to the steering column which is expensive. I believe the steering column is the only way to go after checking all the connections. Thanks guys for the info if the customer does come ba...
2006 Saturn Ion-2 2.2L MIL Lamp on VIN: 1G8AM15F66
Thanks to William from Wisc. Checked the connector behing the drivers kick panel & there was a ton of corrosion in there. I believe it was corroding before water got in there, the water just finished it off. We cut the connector out & connected the wires el...
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