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Prev Professional Automotive Repair Technical Discussions for May 20, 2009
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Open Help Requests for GM
Help Request Answers
2001 Cadillac Seville SLS 4.6L Cluster back lighting VIN: 1G6KS54Y11
This cluster is operating normally other than no back lighting for the gauges. All other interior and cluster lighting functions are normal, including dimming function.The cluster back lights do operate with a display test. No codes in IPC IPM or DIM. I perfor...
2004 Cadillac DeVille DTS 4.6L control head VIN: 1G6KF57934
After minutes of HVAC operation the HVAC controller panel goes blank (sometimes 4 dashes) for an extended period of time. These events consistently set a code B1000, and occasionally sets a code B. During the events all scanner communications are alive, but I ...
1994 Chevrolet Camaro 5.7L Misfire VIN: 1GCF134C76
I have a 1994 camaro.It has a 305 code P and the complaint is a misfire at 4500 rpm.The car is a stick and the kid drives it hard.It has had cap ,rotor,plugs and injector flush.Any ideas would be appreciated
1995 Chevrolet Astro 4.3L tcc quad driver module VIN: 1GBDM19W9S
Need your imput again please. Vehicle came in with only first gear working and owner stated had been to a quiky place to have fluid changed but tranny still wouldn't shift.Couldn't afford new or rebuild so we replaced with a used unit. Used unit seemed to shif...
1998 Chevrolet S10 2.2L MIL Lamp on, VIN: 1GCCSA942W
this truck will not rev up. It doesnt stall, just wont rev, no power. I disconnected the cat, put in new spark plugs, turned off each injector individually and all cylinders were working. The tps seems to be workign normally, o2 sensors are working. fuel press...
2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF55E31
Thank you in advance for your help! I have an Impala here cranks but will not start. Runs on carb spray, I have 55 psi fuel pressure, but dosen't have very good volume? (not sure) No codes in BCM & no security light. It does have P1189c Oil pressure ckt. I al... Trouble codes: P1189
2001 Chevrolet Cavalier 2.2L engine VIN: 1G1JC12431
customer came in saying that she brought her car to the dealer and they told her nothing was wrong but as soon as she left the trac off light came on and the engine hesitated then took off. after this happens three times the battery light,oil light&check engin...
2002 Chevrolet Express 2500 5.7L Misfire VIN: 1GCGG25RX2
This vehicle has had the same issue since new. Dealer played with it to no avail until 44,000 miles and customer gave up on them. We found bad distributor gear and replaced, having no issues for 9000 miles. Came [...] with what customer saw as same problem. Bad... Trouble codes: P0101 (Mass air flow sensor), P0300 (Random misfire)
2002 Chevrolet Monte Carlo SS 3.8L drivers information center VIN: 2G1WX15K12
Looking for wiring schematic for the drivers information center located between the sunvisors. This has the homelink and power sunroof options also. This is for a custom install and need to know where the wiring goes. There is an 8 wire 9 pin connector and a s...
2003 Chevrolet Silverado 1500 5.3L signal VIN: 2GCEK19T63
Thanks ahead of time. This truck came in with the hazards coming on everytime you use the left blinker. the right blinker works fine. The multifunction switch has been replaced, but the problem persists. I have also checked and cleaned the grounds. I would app...
2005 Chevrolet C4500 Kodiak C4E042 6.6L Fuel Gauge VIN: 1GBE4E1215
I have a customers truck that the fuel gauge stays at empty. I have one PCM Code P2068 (Secondary Fuel Sending Unit Voltage High) If the PCM codes are cleared the gauge will work for about 15 seconds then the code returns and the gauge goes to empty. The probl...
2007 Chevrolet Lumina 3.6L pcm VIN: 6G1EK52B27
Middle East Chevy Lumina Holden 3.6L. I'm in Saudi Arabia and getting swamped with these Lumina/Caprices 05-up and having programming Security problems when changing PCM's. Also seeing alot of Traction codes and cann communication codes. We're using Tech-2 wit...
1997 GMC Jimmy SL 4.3L MIL Lamp on VIN: 1GKCS13W2V
This vehicle came re setting all monitors to incomplete as soon you turn the key to off position. Also if you tried to run a drive cycle the monitors begun to run to ready and then just like that they reset to not ready. We checked all grounds and power , we n...
2000 GMC Jimmy SLS 4.3L No Start VIN: 1GKCT18W0Y
This truck is a no start. to make it simple, the spark is fine, no fuel. The fuel pressure is 60-68lbs but the injectors aren't pulsing. Add fuel the truck will start and die. No vltage to injecters. New Ecm. Any help is greatly appreciated. Thanks in advance,...
2003 Saturn L200 2.2L MIL Lamp on VIN: 1G8JU54F83
This one is just strange, on a hill of about 2 miles in length 99% load, freeze frame data records, air fuel ratio of 829, air flow 1.18 gps., 02 sensor #1 2990, o2# 2 846,injector pulse 1.89, all at 78 mph. Have recorded these type of numbers 3 times now. Mos... Trouble codes: 172 (ststem rich), 171 (lean), 171 (lean)

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Reatta 3.8L abs VIN: 1G4EC11C9K
I received 5 replys that the problem could be the high pressure accumilator. After borrowing a brakout box from a local buick dealer and diagnosing per snapon shopkey diagnostic tree for symptoms we described above. Part of the diagnosis included checking eac...
2002 Cadillac DeVille 4.6L lights and climate control head VIN: 1G6KD54Y82
WOW! fast replies. Considering the price of the control head, just needed a little push to go ahead and replace it. Replaced hvac cotrol head and this caddy is gone. Thanks you all.
2005 Cadillac CTS 2.8L ride control VIN: 1G6DM56T15
Thanks to all that replied on the Cadillac. We pulled it back in to our shop and found out that the dealership sold us defective parts. The spring plates were upside down on the new struts. Gm has a faulty part line for those struts.
1991 Chevrolet P Chassis 7.4L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 1GBKP37NXN
Hey everybody, Thanks for the help! I doublechecked and rechecked all the wiring and everything I had done previously. The pickup coil still tested fine, but the ignition module tested faulty again. I was reluctant to change the distributor and was just g... Trouble codes: 42 (electronic spark control).
1995 Chevrolet Tahoe LS 5.7L master cyl VIN: 1GNEK13K5S
okay this was an odd one. I ended up getting another master cylinder and power booster combo unit. Once installed pedal was fine. I bled it once more and adjusted up the rears again and the pedal went soft again. I backed off the rear adjusters and the peda...
1996 Chevrolet K1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEK19R9T
My original post question has been addressed, with success. There was good help directing me to the distributer gear and it was worn. I replaced the gear and was then able to set the cam @ +3*, and it held steady. HOWEVER, I am still setting a code p0300. T... Trouble codes: P0300 (random missfire).
1997 Chevrolet Malibu 3.1L Surge, MIL Lamp on, SURGES AT IDLE ONLY VIN: 1G1ND52MXV
Thanx to all for good suggestions. I've replace FTP (fuel tank pressure) sensor, cleaned injecotrs w/GM solvent, new plugs, wires, 2 O2 sensors, PCV, changed oil, checked for vac leaks, checked exhaust - OK, cleaned throttle & IAC, adjusted idle stop up & down... Trouble codes: P0300 (multiple random misfires).
1998 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R3W
tahoe ended up being the spider injector. it was leaking pressure down thru 2 or more injector tubes. chevy has replaced the old inj with a revised version that has a inj on each spider tube. thks for all the help!
1999 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy
after the last update still no problems with truck i would have to say probably bad connection at pcm thank for those who replied Trouble codes: P0321.
2003 Chevrolet Tahoe LT 5.3L Stall, MIL Lamp on VIN: 1GNEC13Z33
Well Kyle was dead-on the wire was broken on the pass.side head,about 5" above the bolt, solider a new wire on, move to front of engine with star washer,and all is good once again!Thanks to all especialy Kyle,Royce,and Jamie!!! Thanks Marty Trouble codes: P1518 (Throttle Actuator Control Module Serial Data Malfunction).
2007 Chevrolet Malibu LT 2.2L Exhaust leak VIN: 1G1ZT58F07
Thanks for all the replies. As several of you pointed out, I intended to type CO instead of CO2. It's a bit embarrassing to make this error since I taught Auto Tech for 30 years and corrected students on the same thing more times than I care to remember. Hope ...
2002 GMC Envoy SLE 4.2L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1GKDT13S62
Thank you to everyone that replied to this post. I should have gone with my first instinct, which was the computer. I believe that when the vehicle was used to jump start the mower that either the negative jumper cable was clamped to the ecm, or once the jum... Trouble codes: P0502 (vehicle speed sensor low/no signal), U1016 (loss of communications), U1000 (class 2 serial communication problem), C0237 (rear wheel speed sensor circuit fault), C0236 (rear wheel speed sensor circuit), C0267 (pump motor circuit open/short).
1997 Oldsmobile Regency 3.8L Electronic level control VIN: 1G3HC52K2V
Thanks to all that replied. We removed the compressor assembley, applied 12 volts to the vent solenoid. The vent failed to open. Aquired a new control head, installed it and the air suspension system is now functioning as it should.
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