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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 12, 2007
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Open Help Requests for GM
Help Request Answers
1999 Cadillac DeVille 4.6L No Start, MIL Lamp on, VIN: 1G6KD54Y1X
Vehicle won't start unless headlight switch is on. No dash activity unless headlight switch is on. Alarm sounds when anything is done... open door, turn ign, start eng. Trans is not shifting, 2nd gear only (no 12v). All fuses are good and have 12v. Relays chec... Trouble codes: P1605 (loss of HVAC serial data), P1610 (loss of PZM/BCM serial data), P0603 (PCM KAM error/reset), P0758 (2-3 sh sol B cir fault), P1602 (loss ABS serial data or KS mod), P1610 (loss of PZM/BCM serial data)
2000 Cadillac DeVille DHS 4.6L courtisy lights VIN: 1G6KE57Y0Y
Hello every body,got good one,this car at night the courtisy lights comes on for 2 or 3 secound then goes of for 5 minuts and keep on doing it as far the ign is on,hook up tech2 and checked for codes,no codes found in any module,monitor all doors module while ...
2003 Cadillac DeVille 4.6L Battery VIN: 1G6KD54Y23
I have had this vehicle for 2 weeks. Battery goes dead every night if left connected. Car belongs to a used car lot. Bought at auction, so anything is possibe. They installed 2 new Batteries so I can eliminate that as a problem. I love these because my Snap-on...
2003 Cadillac DeVille DTS 4.6L cooling system VIN: 1G6KF579X3
car came in with cooling leaking on driveway only when sitting overnight. pressure test no obvious leak.Was able to see wet around water pump so i replaced and pressure tested,good.Well,it came back following day with leaking on driveway.Checked messages and f...
1994 Chevrolet Caprice Classic 5.7L cooling fans VIN: 1G1BL52P5R
Hello all; This one has been here for a week and I'm glad to have it since there's not much other business. BUT I've been going around with it and it's time to ask for help! So far I have read all the archives on this type of problem but am a little confused b...
1995 Chevrolet Caprice Classic 5.7L exh. man. glowing VIN: 1G1BL52PXS
OK, Guys/Gals I have another one that has come to me with everything in the world already replaced before it got to me. This SS has had an ecm and most of the eng. mgmt. snsrs. replaced as well as a new GMSPO crate motor. (all before it came to my shop) The on...
1997 Chevrolet K2500 Cheyenne 6.5L fuel gauge VIN: 1GCGK24F3V
This truck originally came in as a no start, found the fuel tank collapsed, sender damaged, multiple opens when sweeping it from empty to full. With the new sender, the owner says the fuel gauge swings drastically, will swing the full range when coming up to a...
1997 Chevrolet Venture 3.4L Speedometer VIN: 1GNDX06E7V
This speedometer is driving me nuts!! HELP! And Thank you to all who read and think this one through. This van has a speedometer that will just quit working all of a sudden. So I scoped the VSS when the vehicle was in act up mode and it worked beautifully!! Sc...
1998 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GCDM19WXW
Hey GM guys, need some help here. Vehicle came to us from another shop to start off with. To start we Checked computer codes: po300=random cylinder misfire. watched misfire pattern and noticably missing at idle on cylinder #2. The higher the rpms it moves comp... Trouble codes: P0300
1999 Chevrolet Express 1500 5.7L Speed-O VIN: 1GBFG15R1X
Van came in with a bouncing speed-o & erratic shift. Replaced VCM (after market) & Lastest Flashing. Now shifting is fine but speed-O reads high, dose anyone know calibrates the speed-o.Abs & Cruise work fine and reads correct mph. Dose not have a DRAC that I ...
2004 Chevrolet Express 1500 4.3L hard start VIN: 1GCFG15X54
customer coplaint is when he fills the fuel tank he has a hard time getting started has to hold pedal to floor to get it to start and then after that never seems to have a problem again have checked for codes found po442 and po496 also fuel pressure is 55psi a... Trouble codes: P0442, P0496
2004 Chevrolet Silverado 2500 HD 6.0L Dash VIN: 1GCHK24014
I want to first thank anyone taking the time to read this post. To start off I am away from a technical database at the moment so I need some direction on how to remove the entire dash assembly from this vehicle. It appears that the upper cover needs to cover ...
2006 Chevrolet Silverado 1500 LS 4.8L starter VIN: 2GCEC13V86
Vehicle is a 'No Crank' situation. Starter will engage at relay with jumper wire. Lights on dash come on at times & stay on when key is removed at times. Fuel pump will run when key is switched to 'off' but not when key is switch to 'on'. No communication with...
1995 Geo Prizm LSi 1.6L No Start VIN: 1Y1SK5264S
this one has no ses light,no injector pulse, no spark. i did my checks with shopkey info. i have tried remand ecm dis.i get no spark out of the coil. has anyone had this before? i can try to aswer any questions. thanks bill
1997 GMC Jimmy SL 4.3L Stall VIN: 1GKCT18W5V
vechile stalls on hard accleration blow ecm fuse replace fuse starts okay
1998 Oldsmobile Achieva S 3.1L Stall VIN: 1G3WL52M6W
Car started out being towed in for start/stall. Ignition switch was replaced due to B1000 lack of communication codes, theft sensor due to P1629 in PCM with no start. Car runs fine at times, other times it has a start/stall due to theft deterrent kicking in. S... Trouble codes: B1027 (IPC Bad R code this ign cycle), B1026 (IPC Bad timing this ign cycle), B1629 (PCM Theft deterrent crank signal malfunction)
1998 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN52K0W
I need a little help on this Olds. The vehicle gives no codes with a no start condition. I have no injector pulse and no spark. The customer pressure washed the engine bay about a month back with the same condition. After unhooking computer and module the vehi...
1996 Pontiac Sunfire SE 2.2L cranks wont fire VIN: 1G2JB1247T
hello to anyone who reads this this car cranks ok but no spark or fuel pulse no crank rpms to the scanner first tested the crank and cam sensor signals at the pcm both signals are present while cranking but i dont know if they need to be alingned at any certai...
2002 Saturn L200 2.2L Starting VIN: 1G8JU54F22
This one runs us to a dead end. ECM displays a U1000 code (data link malfunction). Checked all basics. Found there is no comunication with BCM. There are no door locks,interior lights, security light or shift interlock. Anyone got a clue?

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick LeSabre Custom 3.8L door locks VIN: 1G4HP54K41
Thanks for all of your help guys!!! It did end up being a bad lock actuator. Installed the new acutator and all works perfect now. Thought it may have been that but with out scan tool and schematics didn't want to condem that with out seeing if other people ha...
2003 Buick Century Custom 3.1L Surge VIN: 2G4WS52J13
Hi and thanks to all, we took all the info and started with a back pressure test of the exhaust and it had 5psi off idle so we replaced the cat and she ran great. This car had bad plugs and wires that were replaced a while back and a intake manifold reseal job...
2001 Cadillac Catera 3.0L cooling system VIN: W06VR54R71
well the catera is done and just left.most of the 10 reponders were very helpful and i want to thank you.the over all fix for us was replace the cooler,the radiator and all hoses.the cleaning was the real time killer.after tearing the motor down to the cooler ...
2004 Cadillac SRX 3.6L downshift clunk VIN: 1GYEE63794
Thanks to all who responded. While waiting for free lift we continued to drive car for parts and other various things. We put another 100 miles on it and everything was perfect. I guess it just needed more time to adapt. Car was released back to the used ca...
1986 Chevrolet S10 2.5L Stall VIN: 1GCDT14R2G
i removed the fuel pump relay and found corrosion on the contacts. after replacing it , the vehicle was test driven several times with no stalling. thank you to all who replied.i recieved great information.
1989 Chevrolet Camaro Iroc-Z 5.7L Cuts out, Stall VIN: 1G1FP2181K
sorry response took so long.Just got car back for diag.Turns out it was a combination of maf.and a slack timing chain.Thanks to all that helped.Got some real good replies.
1994 Chevrolet C3500 7.4L Master cylinder VIN: 1GDHC34K5R
As I said this is a fleet vehicle of our local telephone co. they needed the vehicle for service repairs, will bring back when happens again, Sorry no fix.
1995 Chevrolet Caprice Classic 5.7L Oil leak, front cover area VIN: 1G1GL52P45
Thanks for all the good info guys, really helps. We removed the front cover and replaced the water pump drive, (bearing was loose) and installed the drive seal with the GM tools. The GM # for the tool kit is J39091-2, water pump drive seal installer is J 39089...
2000 Chevrolet S10 2.2L No Start VIN: 1GTCS144XY
Thanks for all the replies the problem was the vehicle theft lockout in pcm. Since I was useing an OTC scan tool I had to do the 30 min relearn instead of the 10 min relearn.After that the car started and I was able to do the crank relearn. Thanks again. Trouble codes: 1336A.
2001 Chevrolet Blazer LS 4.3L Poor Idle Quality, Hesitation, Surge VIN: 1GNDT13W81
i wanna say thank you to all replies ...but on gut feeling i had tried a maf sensor and it fixed the issue ..alldata has perameters but tells you to test against known good vehicle ,dont have one to test against , so like i said the gut feeling paid off ...tha...
2001 Chevrolet Express 1500 4.3L Hesitation, Misfire, MIL Lamp on
Thanks everybody for the help I guess customer lost faith in me. The can of lucas almost fixed the lifter noise,but still counted missfires last time I've seen .I didt have the proper equpment to do a crank variation relearn, now I do. If i see the van again i... Trouble codes: P0300, P0301.
2002 Chevrolet S10 LS 4.3L fuel gauge VIN: 1GCDT13W82
At some point during testing and removing the cluster, the fuel gauge just started working. The vehicle stayed here for two weeks and it never stopped working again, so we let the customer have it back and informed him that if it failed again, we would replace...
1993 Oldsmobile Cutlass Supreme S 3.1L heater control VIN: 1G3WT34T4P
Thanks everyone I found one on carparts.com. We looked there before and there were a few just unsure of the quality of used parts from yards that I'm not familiar with. Thanks again
2001 Oldsmobile Aurora 3.5L customer said harsh shift VIN: 1G3GR64H51
I planned to pull car apart customer worried about warrenty told him needed to pull apart and would take care of it I am sure needs valve body update but as always It is working great and will stop back in a week or two When he comes back will update again Tha...
2003 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ43D73
Here goes... I had some really great help - thanks to everyone. Bottom line on this vehicle is that this vehicle will not communicate with red brick, Genysis, or Tech 2. I was able to get system in readiness mode and it passed the emissions test at state facil...
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