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Prev Professional Automotive Repair Technical Discussions for April 16, 2012
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Open Help Requests for GM
Help Request Answers
1991 Buick Century Special 3.3L Ecm VIN: 1G4AG54N0M
Got a 91 Century that has been driven through the parts dept. Spark no injector pulse no Check engine light no communication with the ECM. I need a wiring diagram for ECM/aldl/engine light please.
2001 Buick Park Avenue 3.8L Poor Idle Quality, Hesitation, Cuts out VIN: 1G4CW54K41
Customer brought vehicle in for a ck eng lt. After scanning a P0102 showed up did some cks and replaced the sensor. He also said the car would hesitate at times when accelerating from a stop. After the MAF replace I drove it and felt the cutout. When I accel f...
2006 Cadillac CTS 2.8L No Start VIN: 1G6DM57T96
VEHICLE CAME IN WITH A NO START CONDITION AND KEY NOT BEING ABLE TO BE REMOVED. had a u0100 loss of communication code. HAD NO COMMUNICATION WITH ECM. using tech2 pinged the modules. it looks as if all modules are present except the ecm. REPLACED ECM AND VEHIC... Trouble codes: U0100 (Loss communication to ecm)
1994 Chevrolet Caprice Classic 5.7L failsafe erratic dtcs VIN: 1G1BL82P5R
vehicle was brought in operating in failsafe with codes 84 3-2 downshift sol feed back fault, 34 map sensor signal low code 83 tc quad driver module fault. after finding high resistance on the 3-2 ds sol. we checked the wiring from the pcm to the trans and eve...
1996 Chevrolet C1500 Suburban 5.7L blower motors VIN: 3GNEC16R9T
front and rear blower motors run with ignition off. Replaced ignition switch still same problem. Please help! With key off and blower switch off fan is off. But if you turn fan switch on runs in all postitions. Also the same for the back. Thanks in advance.
2000 Chevrolet Silverado 2500 6.0L transfer case VIN: 1GCGK29U8Y
truck has noise simular to hub bearing noticed front drive shaft turning when in 2wd switched to 4wd works fine when switch back to 2wd d shaft stops turning n noise is gone turn of key and restart d shaft is turning again any suggestions has a jasper transfer...
2003 Chevrolet Avalanche 1500 5.3L Reverse gear VIN: 3GNEC13T13
Hi, Guys this vehicle is my own.2003 Chevy Avalance with 5.3L and 4 speed electronic auto transmission. The tranny was overhaul once, went out again. this time it did more damage, the stator shaft and reverse drum was damage beyond repair where the seals ride ...
2004 Chevrolet Monte Carlo LS 3.4L radio VIN: 2G1WW12E14
Hi guys, Got one here has me stumped. Car comes in with air bag light on and no volume from radio. Customer stated that when airbag light would come on there would be no volume from radio. AB lightis on constant and no volume. We tried a radio from a junkyard ...
2006 Chevrolet Impala LS 3.5L Does not engage in any gear VIN: 2G1WB55K16
This car was brought into me today because it no longer moves. He stated that yesterday it was slipping so he added some "stop slipping trans fluid" (magic in a bottle) and then today it completly stopped moving. The transmission does not engage in any gear ...
1990 GMC Safari 4.3L Stall VIN: 1GTCM15Z8L
Vehicle came in as a no start i diagnosed bad distributor. Replaced Distributor with some WPS brand even though i asked for an OE distributor but according to my service writer OE distributors are no longer available. In the process of setting timing the start...
2003 Hummer H2 6.0L Ride Control VIN: 5GRGN23U73
Hummer came in with Sevice Air Suspension Light On. Code c0711. Pressure Valve. Went though tests and determined it needed a Compressor assembly.Bought new Compressor without Controller.Installed assembly. I can communicate with module for codes,but will not a...

Fixes & Summaries for GM
Fix/Summary Answers
2006 Cadillac STS 3.6L Power Seats VIN: 1G6DW67726
I never had the vehicle cause a excessive drain for me. (I meant to type in mili-amps). Thanks Dan [...] from Texas. You hit the symptom to look for! A sticking seat switch. I kept operating drivers seat and it would always work. Tried passengers seat a af...
1976 Chevrolet Corvette Stingray 5.7L Electric Window VIN: 1Z37L6S422
1982 Chevrolet Corvette 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1AY8785C
even thou it had a new distrutor i ohmn out pick-up and the readings were way off. changed pick-up and wires customer is happy even thou i thought still had problem Trouble codes: P0042.
2000 Chevrolet Malibu LS 3.1L No Start VIN: 1G1NE52J2Y
First of all THANKS to all who replied.With all the brain power here.We should be running the goverment.Many replies said ignition switch.We put one in fri and kept the car just to make sure.All is fine and cust. just left. Again thanks
2003 Chevrolet Trailblazer North Face 4.2L MIL Lamp on VIN: 1GNET16S83
Thanks to everyone that participated. Since many had tried and failed to fix this car, and the cost was becomming a concern for our customer, I walked out to this vehicle in a different state of mind. I thought I had already found the problem in the PCM suppli... Trouble codes: P1271 (App 12 correlation error).
2001 Saturn LW300 3.0L Mechanical VIN: 1G8JW82R01
I would like to thank everyone for thier input it was very helpfull in my process of illumination. My time is up, I came up with doing a bg intake,fuel system cleaner and had to ship the car. customer called back and said was running well and no engine light w...
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