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Prev Professional Automotive Repair Technical Discussions for August 11, 2005
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Open Help Requests for GM
Help Request Answers
2001 Buick Regal LS 3.8L 3-4 shift VIN: NO VIN
I have this 2001 Buick Regal, mother's friend, that I'm trying to fix and I have little trans experience. I'm hoping that some of you may have seen this type of problem before. It won't shift into fourth gear at all. 1-2 shift is pretty good, but 2-3 shift wil...
1997 Cadillac DeVille Concours 4.6L unwanted stabilitrack activation VIN: 1G6KF5294V
customer brought this vechile to us complaining of his stabiltrack lamp coming on and int brake activation when brakes not applied. we have had this vechile for over two weeks now. the fault occurs we let it sit in heat of the day and then drive it usually hap...
1993 Chevrolet S10 Blazer Tahoe 4.3L Excessive Emissions, Poor Idle Quality, Surge, MIL Lamp on VIN: 1GNDT13W8P
Vehicle runs good when warm, but idles rough when cold.Customer says it acts like it is getting too much fuel. I havent had a chance to check it when it was cold. customer is from out of town and hadnt been able to leave it. Check engine light seems to only c... Trouble codes: 45 (rich exhaust)
1995 Chevrolet S10 2.2L Excessive Emissions, No Start, Poor Idle Quality, Stall VIN: 1GCC1445R8
Cranks OK, will rarely start and idle, mostly have to give about 1/4 throttle to get it to idle irraticly, give more peddlie and engine will die. I took timing cover off and chain and guides look good, dots line up. I pulled vacuum on Map sensor while watching... Trouble codes: 33 (Map- Voltage High)
1996 Chevrolet p30 7.4L MIL Lamp on, no communication VIN: 1GBJP37N6T
Hi, I can not communicate with this vehicle the customer stated that he has had his check engine light on for the last 20,000 miles and has had it in numerous shops. no one has been able to communicate with the pcm. I have checked all powers and grounds at the...
1997 Chevrolet Monte Carlo LS 3.1L No Start VIN: 2G1WW12M8V
This Monte requires 2 cycles of the key to build required fuel pressure to start. After the initial cold start, it will start OK and runs great. I suspect a leak-down problem at the pump; a costly item. All help is greatly appreciated!
1998 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on VIN: 1GCEK19RXW
Hi group! Got one here that is being a pain. This vehicle came in with the MIL on. Checked for codes found code PO102 and PO340. Check for power to MAF found none. Checked fuses found eng 1 20 amp fuse blown. Replaced fuse and cleared code. Recheck MAF operati... Trouble codes: P0102
1998 Chevrolet Blazer 4.3L radio VIN: 1GNDT13W2W
A customer had their battery fail. They bought the vehicle second hand and did not know the code to the radio. The dealer told them that the radio would have to be removed and a bar code scanned (sounds like bs to me)$85. I retrieved the codes from the radio a...
2000 Chevrolet S10 2.2L abs module VIN: 1GCCS195XY
hi group came in complaint when you get to aprrox 50 mph mil will come on abs light comes on and speedo drops down then comes back up, had code co237 rear speed sensor erratic, monitored signal at pcm no glitches in signal to pcm, signal out was erratic, found...
2001 Chevrolet Impala 3.4L power VIN: 2G1WF55E11
hey guys i have a 01 impala that came in with the coolant and trans fluid mixing in the radiator cooler side for the trans. we replace the failing radiator perform coolant and transmission flush and transmission has no power and makes a clicking noise. transm...
2001 Chevrolet Silverado 1500 4.8L Heater Core VIN: 2GCEC19VX1
I am removing the heater core from this Chevrolet truck. Mitchell On Demand was not much help. I know the dash has to be folded back for access for the ac/heater box removal. Need to know if the top dash panel has to come off for access to other screws that ar...
1999 GMC Jimmy SL 4.3L 4x4 VIN: 1GKDT13W1X
Hi there, I have this Jimmy that was the 4x4 in very bad shape the client whants me to disconnect the 4x4 for good, I dont have i diagram so I tried disconnecting the 4x4 fuse but this fuse controls also some gages, gas, temp, etc. can someone tell me wich oth...
2003 GMC Sierra 1500 SLE 4.3L No Start VIN: 2GTEC19X03
Good afternoon. I have a GMC truck that intermittently starts and dies. If you hold the key to start, it will crank-fire-quit cranking-die all in approximately one to two seconds, then repeat the process over and over without letting up on the key. When this o... Trouble codes: P1626 (Loss of communication with VTD)
1998 Oldsmobile Aurora 4.0L exterior lights VIN: 1G3GR62C3W
headlights, marker lights, & tail lights stays on intermittently. lights also flicker on & off...erratically, eventually killing battery.
1995 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, no communication VIN: 3G2JB524XS
This vehicle failed emissions, checked computer - no communication with any control module. Pulled Mitchell on Demand test for no communication at DLC. Terminal #16 on DLC has B+, terminals 4 and 5 are grounds as they should be. However, It asks to check for v...
2001 Pontiac Grand Am SE 2.4L high idle speed VIN: 1G2NE52T81
Hey all, I have this grand am here driving me nuts. should have been simple job. vehicle came in with no problem except MIL on. scan with MT2500. code P0122 in memory. looking at freeze frame data I saw TPS voltage at 0.00v. checked TPS with graphing meter and... Trouble codes: P0122 (tps voltage low)
2002 Pontiac Grand Prix GT 3.8L No acceleration at W VIN: 1G2WP52K52
We only got a brief look at this car yesterday but it will be comming back in today and I think I need a heads up as this has the "feel" of a complicated issue. Customer complaint was that the car was sluggish under acceleration. Well, it is not sluggish...it...
1993 Saturn SL2 1.9L serpentine belt VIN: 1G8ZK557OP
this saturn has a loud squeal from the belt area on cold starts it seems to go away after it warms up a little the belt is fairly new and the tensioner feels good. I have heard several of these cars make this noise but this is the first I have tried to fix and...
2000 Saturn LS2 3.0L Poor Idle Quality, Hesitation, Service Wrench lit VIN: 1G9JW52RYY
This saturn came in the other day with complaint the car had started running poorly and shifting hard. custmer stated the engine light was on. By the time they brought the car in it started running fine and light was off. I hooked up out modis and only code fo... Trouble codes: P0000 (Lost communication or undefined Code)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Century Special 2.2L Speedo, Fan,temp Lt VIN: 1G4AG5540R
Seems there is no easy way, (or not one I can find) to get this info. Thaks for all who took time to read, and those that replied.
2001 Buick Regal LS 3.8L MIL Lamp on VIN: 2G4WB55K11
well i have had a enormous ammount of replies on the use of a non oem convertor.i did install a new convertor from general motors.and the car has not been back since,it has been a couple of weeks now and i feel safe to say that cured the problem.i want to than... Trouble codes: P0420.
1992 Chevrolet Camaro RS 3.1L No Start VIN: 1G1FP23T3N
The car is outta my life !! Many thanks are expressed to all of you for keeping my nose to the grindstone. Ckt430 was where the problem was. The wire resistance was fine,however, if the pin at the ECM connector is making pooor contact, the ECM can't receive it... Trouble codes: 34 (Map sensor too low).
1999 Chevrolet Tahoe LS 5.7L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 1GNEK13R4X
hello techs thanks so much for all the responses. Replaced 4 injectors and fuel pressure regulator and vehicle has been 'gone' without return for 3days. Fixed!! Thanks again David [...] Trouble codes: P1133, P1153.
2002 Chevrolet Impala 3.4L battery VIN: 2G1WF52E92
We finally came to the conclusion that the radio was not the problem but disconnecting the instrument cluster removed the drain. We are not sure the cluster is the problem and customer does not want to spend $640.00 on part knowing it is non returnable. What w...
1996 GMC Jimmy 4.3L MIL Lamp on VIN: 1GKDT13W7T
I would like to thank those of you that responded, it really helped in this case. As several of you had suggested, a sticking valve guide was the problem. We disconnected the body's vacuum supply line and hooked up a vacuum gauge to the same supply, and then... Trouble codes: P0303 (missfire 3 cylinder).
2001 GMC Yukon XL 1500 Denali 6.0L a/c compressor VIN: 1GKFK66U11
thje customer picked it up for a weekend camping trip on friday and wopuld bring in on tues. he called on tues and said he had it fixed while out of town. thanks for all the help, the compressor ws the problem thanks, bob
2001 Pontiac Grand Am SE 2.4L lights on instrument panel VIN: 1G2NF52T81
first of all i would like to thank everyone for the help. we ended up with three modules bad the pcm, bcm, and the abs all took a hit. as howard said in his post the u code is a communication error which indicates the brain is dead. we had to send this car to ...
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