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Prev Professional Automotive Repair Technical Discussions for October 29, 2009
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Open Help Requests for GM
Help Request Answers
2000 Buick LeSabre Limited 3.8L Unknown VIN: 1G4HR54K7Y
Not a hvac guy but have a good customer with a problem. We have a auto system with driver and passenger controls. The passenger side gets hot while the drivers side is cool. Both sides are set at 90 degrees. Any help appreciated.
2005 Buick Terraza CX 3.5L stability system VIN: 5GADV23155
this car came in with a customer complaint of abs coming on when driving straight down a normal dry road, not braking. scanned for codes and found a c0196 yaw rate sensor circuit malfunction and a c0253 centering error. we backprobed the ebcm wire for the yaw ...
1999 Cadillac Seville STS 4.6L door locks & switches VIN: 1G6KY5492X
I road tested vehicle today and while driving, the dash would "BING" and message came up "Left rear door ajar" then I looked back at door and the switch for heated seats was on LO. I tried shutting if off but switch would not work. Tried the lock switch on tha...
2000 Cadillac Seville SLS 4.6L Hesitation, Misfire, MIL Lamp on VIN: 1G6KS54YXY
Customer recently had head gaskets completed. After a few months of running well car intermittently will misfire badly and buck, jerk, backfire, and set codes. Has been to a few other places before me for this problem. Apparently will start and run after sitti... Trouble codes: P0352 (Ignition coil 2 control circuit), P0353 (Ignition coil 3 control circuit), P0355 (Ignition coil 5 control circuit), P0358 (Ignition coil 8 control circuit)
2002 Cadillac Seville SLS 4.6L service engine soon VIN: 1G6KJS544X
service engine soon light does not come on when ignition key is first activated .i removed the instrument cluster to check the mil service engine soon bulb and found it is part of the circuit board. how can i test this system to find where the fault lies.
2000 Chevrolet Express 3500 7.4L Misfire, MIL Lamp on VIN: 1GBJG31JXY
Vehicle came in misfire detected ck misfire history cyl 3,5,6,&,7 have misfire history ck plugs ok ck dist cap ok did replace wires as # 6 was leaking. Performed an injector balance test and the results were all the same each cyl started at 51psi and ended at ... Trouble codes: P0300
2000 Chevrolet S10 Xtreme 2.2L No Start, fuel delivery VIN: 1GCCS1942Y
No start, many issues here. Unplug the injector harness, key in run, has "all dash indicator" lights, fuel pressure 42 psi and holds. Plug in the injector harness, key in run, only "check engine" and "battery" indicator lights are on, fuel pressure 42 psi, the...
2001 Chevrolet Silverado 2500 HD 6.0L temp door actuator VIN: 1GCHK23U21
This sys. has aut. climate control. Temp only goes to hot in full hot position, any other position is like vent pos. On first start up when cold looking at scanner you can see counts of temp door actuator goes to 70 with out going to full hot in 7/8 hot positi...
2002 Chevrolet Silverado 2500 HD LT 8.1L shifting VIN: 1GCHK29G12
Well I'm not to much up on these allison trans problems so all help is greatly appreciated. When the vehicle is cold and sits outside the trans will make this buzzing sound almost like the pump is cavitating from cold fluid. This morning I went to drive it and...
2005 Chevrolet Cobalt 2.2L many VIN: 1G1AK52F25
Hi gang..Have various issues w/this vehicle...Came in for LOF at which time "power steering" message was noted on dash. Finished with service, park car and stayed running for 3-5 sec. after turning key off. Advised customer and now vehicle in to diag these iss...
2005 Chevrolet Equinox LS 3.4L Stall, MIL Lamp on VIN: 2CNDL23FX5
vehicle came in with s.e.s. light on and these codes stored u2100,u1000,p1626,u0140, u0121. vehicle does stall, when tried to restart, 1st time engine will crank will not start 2nd time will not crank, 3rd time cranks and starts. does not do it all the time. c... Trouble codes: P1626 (theft deterrant feul enable signal lost), U0140 (loss communication with bcm), U0121 (loss communication with ebcm), U2105 (loss communication with ecm), U1000 (class 2 serial data link)
2006 Chevrolet Monte Carlo SS 5.3L cyl #4 VIN: 2G1WL15C86
This car is driving me crazy.I keep getting a p0300 random miss fire code. As I watch miss fire data cylinder #4 is miss firing the most.Some times it will not miss fire. While it miss fires I hear almost like a lifter noise. It is smoking from the tailpipe al...
2008 Chevrolet Silverado 3500 HD LTZ 6.6L Tire size VIN: 1GCJK33668
Hi everyone, This customer has had some new oversized wheels and tires installed and needs someone to calibrate the speedometer. We have a J2534 flashing tool and were wondering if it is possible to change the tire size through GM Tis. If so could someone pl...
1999 GMC Savana 3500 6.5L No Start VIN: 1GBHG31F9X
Unit came in for a no start, so I did my usual, ck codes for a p0251a cam timing (optical sensor), cked fuel pressure 6psi, cked fuel cut off for power and ground ok, installed known good test pmd, ok. still a crank no start, removed rear most fuel lines and c... Trouble codes: 251A
2003 Other GM h2 6.0L Accessories VIN: 5GRGN23U63
Hell...Now it's my own vehicle that brings me here! My wife's H2 today decided to start spraying washer fluid from the washer intermittantly. It seemed to progress to full time and the rear wiper started to stay engaged for a while, ignoring commands from the ...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac Seville STS 4.6L Drivers Power Seat VIN: 1G6KY5492X
As most of you pointed to about checking powers and grounds, this was the proberbial "Needle in a Haystack" without the use of "Excellent" wiring diagrams provided by a couple of guys that replied here. You guys are my Heroes. I had only .3 Volts at the oran...
1999 Cadillac Seville STS 4.6L Steering Tilt & Telescope VIN: 1G6KY5492X
As most of you pointed to about checking powers and grounds, this was the proberbial "Needle in a Haystack" without the use of "Excellent" wiring diagrams provided by a couple of guys that replied here. You guys are my Heroes. I had only .3 Volts at the oran...
1991 Chevrolet Corvette 5.7L No Start, Stall VIN: 1G1YY2381M
Alright we got it. Come to find out the car had 1 bad injector. And since the injectors are wired parallel if on goes bad it shuts all injectors down. Thanks for all the help
1993 Chevrolet Corvette 5.7L Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1YY23P9P
After getting Jamies post I did look back at all my readings and realized I had overlooked a couple things.I did the voltage drop tests that were reccomended by other Techs. I decided the computer was bad, there wasn't a reman avaiable so I sent the original o... Trouble codes: 13 (left oxygen senor), 45 (left bank rich).
1996 Chevrolet Blazer 4.3L No Start, no spark VIN: 1GNCT18W3T
Many thanks to the 28 replies I got First thing I did was knock out the clogged screens in the distributor as a few of you said Second thing was install a NON AFTERMARKET Dist. cap and rotor..(which 90% of you said) Got a lot of replys about coil...but coil p...
1998 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK19R3W
First I want to say thanks to all of you who helped me on this one. we are re-assembling this vehicle right now. Turns out it had a bent exhaust valve on #6. How it got bent is a mystery to me. I didn't think these were interference motors. the valve stem was ... Trouble codes: P0300, P0155, P0161 (o2 sensor heater circuit b2s1), P0442 (evap system small leak detected), P1345 (crank/cam sensor correlation cyl discrimination signal).
1998 Chevrolet Camaro 3.8L blower motor VIN: 2G1FP22K2W
Humming noise went away with ac delco blower motor. The original blower fan was off balance creating the humm9ng noise. The first new blower motor i got for the car did the same thing. I got a second one and that solved the problem.
2000 Chevrolet Astro LT 4.3L Starting VIN: 1GMCCAS427
ok the van is fixed, found orange wires in front of the battery green and rotted off,it was a 1 to 2 wire splice. That got me spark and fuel pump, and communication with pcm. Then it would start and die,and set code P1695-anti theft fuel shut off, and no comm...
2001 Chevrolet Impala 3.8L abs VIN: 2G1WH55K21
Thanks for all the help. Most blamed the sensor harness which we checked. Paul from Ma. hit the nail. The hub assembly, with sensor, was the culprit. Thanks again for the valuable info.
2006 Pontiac Montana SV6 3.5L chime VIN: 1GMDV33L56
this car belonged to a car dealer and they ran it through a auto auction before we could determine the problem, however we think the sliding door had lost its position on the limit sensors.thanks to all of the people that replied to my help request.
2005 Saturn Ion-2 2.2L MIL Lamp on VIN: 1G8AJ52F05
After reading all the replies I removed the tank to check all the hoses on top. All of the hoses were OK so I ordered a canister. After removing the canister I covered the purge line with my finger and tried to blow through the canister (tank line to vent line... Trouble codes: P0446.
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