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Prev Professional Automotive Repair Technical Discussions for September 3, 2009
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1997 Buick Park Avenue 3.8L in car temp VIN: 1G4CW52K0V
OK, here is the problem. This Park Ave. with automatic temp control w/ passenger side temp control it seems to have no in between when setting the temperature. If you turn the A/C on with the temperature at the lowest or close to the coldest setting when you r...
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1998 Cadillac Seville SLS 4.6L Cooling Systems VIN: 1G6KS54Y9W
well hear a gm puzzle, replace new water pump, thermostate flush system 8 month ago. new radiator was also replaced 5 month ago due to leak. now customer came back differnt problem. when he drive car about 20 minute temp guage spike to high pull off to side le...
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2004 Cadillac CTS 3.6L Poor Idle Quality, Hesitation, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1G6DM57704
the vehicle came in under reduced engine power. Had 5 codes in the system for different things. When the codes are cleared they immediately come back on. If you try to clear the codes with the vehicle running the oil light will come on but will reset after res... Trouble codes: P0452, P2229, P2123, P0101, P0522
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1977 Chevrolet G20 Beauville 5.7L Mechanical VIN: CGL267U227
thanks in advance. This one came in with a brake light on and a brake pedal that would slowly go to floor. Customer did not have me diagnose just put in a master cylinder and bleed system. bench bleed master cylinder and bled complete system, pedal goes to flo...
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1997 Chevrolet S10 2.2L Hesitation, Cuts out, Stall VIN: 1GCCS1948V
This truck has been driving me crazy! Thanks ahead of time for any info you guys can give me. This truck came in about a week ago with a intermittent stall and no start. I have been stranded twice test driving this thing. It starts off fine and within a mile i...
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2001 Chevrolet Tahoe LT 5.3L knocking/severe ping VIN: 1GNEC13T71
when vehicle is started and idling with a/c on in gear. severe knock/pinging occurs. with out a/c on, condition is not present.Idle speed is correct. acts like its loading up when a/c is on and if you raise idle speed slightly with gas pedal, condition goes aw...
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2004 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GCEC14V44
Truck keeps setting PO336. Have checked wiring from pcm to sensor and show to have good continuity (0.3-0.4 ohms) Have got 12 volts on circuit #1867. Have changed sensor twice, also got wiring harness off salvaged engine and ran another harness from pcm to sen... Trouble codes: P0336
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2006 Chevrolet Trailblazer SS 6.0L Steering wheel controls VIN: 1GNET13HX6
Hello fellow gm techs I need a vci # for this trailblazer ss bcm local dealer dragging their feet vci is for bcm I need to change rpo for steering wheel controls I have tech 2 & tis to web reprogramed new bcm preformed set up in misc' test can not change rpo t...
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2007 Chevrolet HHR LS 2.2L Poor Idle Quality VIN: 3GNDA13D37
this is a 2007 hhr ecotec , problem only happens on cold start for 15 seconds , misses and seems to run rich then will clear up and run fine , happens so fast cant see anything on scanner no codes , tried cleaning injectrs and added recommended upper eng clean...
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2000 GMC K3500 Sierra SL 6.5L head gasket VIN: 1GTHK33F0Y
This truck came in with classic symptoms of a blown head gasket. Pulled both heads and sure enough the LH gasket was badly blown. The problem I have is that when the gasket blew it left a slight imperfection in the block surface. It is not bad but it is there....
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2003 GMC Envoy XL SLE 4.2L radiator VIN: 1GKES16S13
have an envoy that is overheating with the a/c on in 100 deg temps. customer first brought vehicle in with complaint of a/c issues. we found high side pressure to high. we also found code p1481 in the pcm. while monitoring fan speed we couldn't get the fan spe...
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2003 Pontiac Aztek 3.4L no guages, lost comm VIN: 3G7DB03EX3
Guages inop (except Speedo) Odometer reads error. Shifter stuck in park. Backup lights inop. Someone before me has installed an external start button. The vehicle starts and runs fine. I cannot access the PCM using my Genisys. I connected with the other module... Trouble codes: U1016, U1040 (Lost Communication with EBCM), U1096 (Lost Communication with Instrument Cluster)
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Fixes & Summaries for GM
Fix/Summary Answers
2007 Buick LaCrosse CX 3.8L door locks trunk release VIN: 2G4WC58297
Well, unfortunately the vehicle was needed more than the door locks were, so I had to put a larger band-aid on it in the form of a circuit breaker. Couldn't get the fuse to blow again no matter what I tried. Steve had a good point in looking for water intrusio...
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1997 Cadillac Seville STS 4.6L battery VIN: 1G6KY529XV
CUSTOMER NEVER RETURNED. THE PROBLEM WAS THE BCM. I DISCONNECTED THE THE BCM AND THE DRAW WAS GONE. THE CUSTOMER DID NOT WANT TO GO FOR THE BCM AT THAT TIME. WAS GOING TO COME BACK FOR THE REPAIR. THANKS FOR THE HELP
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2003 Cadillac Escalade ESV 6.0L 1-2 shift VIN: 3GYFK66N83
AFTER VERIFIED CONTINUITY BETWEEN SHIFT SOLENOID AND PCM. AFTER REMOVING PAN. ALSO NOTICED CUSTOMER HAD NOT ACTUALLY REPLACED 1-2 SOLENOID AS HE DESCRIBED. WE REPLACED 1-2 SHIFT SOLENOID NO MORE PROBLEMS. THANKS FOR YOUR REPLES.
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2004 Cadillac DeVille 4.6L d/s window VIN: 1GKD54Y74U
THANKS TO ALL THAT REPLIED, WE DID GO BACK AND RE CHECK WIRING ONLY TO FIND THAT THERE WERE 2 GROUNDS BAD INSTEAD OF JUST THE ONE, REPAIRED GROUND CIRCUIT AND ALL IS WELL, FINDING MORE ELECTRICAL PROBLEMS WITH WIRING IN NEWER CADILLACS
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1974 Chevrolet Vega 2.3L fuel guage/oil pressure guage VIN: 1V77B4U346
We dropped tank. Found previous owners tech was inventive & installed pump that would work.(gotta give him credit). Too bad he removed sending unit portion of pick-up, cut wires & left wire from op switch disconnected. We appreciate the three responses we re...
3
2005 Chevrolet Aveo LS 1.6L warning light VIN: KL1TD52695
Sorry it took so long to close this but after several phone calls the customer has not brought the car back in. Not sure if we fixed it while checking connections or she did something else. I have not even gotten a return call.
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2006 Chevrolet HHR LT 2.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNDA23P76
Well I believe This Vehicle is fixed i replaced all injectors more top engine clean in the cylinders due to serious carbon build up on piston tops and valves. The spark plugs were replaced with OE ac delco (previous) the Check Engine lamp went out on its own w... Trouble codes: P0300 (Random Cylinder Misfire), 4561 (Undocumented code traction control sets when mifire does).
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1996 Oldsmobile Cutlass Supreme 3.1L brake pedal VIN: 1G3WH52M1T
OK thanks to everybody for your help. I bought a used ABS module which came with a fairly new master cylinder (must have been replaced recently). To isolate which of the two components were bad I blocked the ports of the old master cylinder to test it and it...
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1999 Oldsmobile Intrigue GL 3.5L Stall VIN: 1G3WS52H2X
customer is driving car until concern is more consistant, explained some things it could be, but no guarantee that the part will fix concern. will update if more information becomes available Trouble codes: N0NE.
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2000 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB5248Y
Thanks for all the Help. Sorry for the late post. I had put in a fix post but I guess somthing went wrong and it didnt close. Ended up finding the EBCM was shorting the bus high. Found this with a lab scope monitering the bus line. I started unpluging modu... Trouble codes: U1016, U1000, U1000, U1040, U1064, U1301.
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