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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 7, 2011
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Open Help Requests for GM
Help Request Answers
1991 Cadillac DeVille 4.9L Poor Idle Quality, MIL Lamp on, no communication VIN: 1G6CD53B7M
Vehicle idles rough/misfires, service engine soon and service vehicle soon lights are on, fuel mileage data inop, and speedometer inop. These things all happen at the same time and it is intermittent. Usually happens at start-up, sometimes only lasts a minute ... Trouble codes: 52 (PCM Memory Reset)
2002 Cadillac Seville STS 4.6L Windows, Door Locks VIN: 1G6KY54912
Caddy came in with no windows operating and R/R window 1/2 way down. No door lock operation from inside switch. Window lock switch would not operate, no green light. At one time when my tech removed the master switch from the door panel, the drivers window wou...
2004 Cadillac SRX 3.6L Compressor VIN: 1GYEE63754
Car came in with AC working sometimes, we sucked it down found it wasn't low, recharged, found Compressor was not engaging. Tested Relay found Missing signal to relay, if jumped Compressor engages. Replaced relay just to be safe. Very odd is if you press the A...
1992 Chevrolet Lumina 3.1L fuel injectors VIN: 2G1WL54TZN
i need help! i have been pulling my hair out for 2 weeks on this car i have intermittent spark and i have no ground on my injecters both sides light up the test light evan when unpluged obviously no noid replaced inition mod. and crank sensor checked crank sen...
1998 Chevrolet Malibu 3.1L fuel/temp gauge VIN: 1G1NE52M9W
customer brought car in with the fuel gauge and temp gauge not working. i checked fuses and found the fuse in the underhood fuse box marked A/C-BFC blown. replaced fuse and everyting went back to working. the vehicle worked fine for a couple days then came bac...
2000 Chevrolet Monte Carlo LS 3.4L Passlock VIN: 2G1WW12E0Y
We have a 2000 Chevrolet Monte Carlo that came in with a lock cylinder that was siezed up. We replaced the lock cylinder and ignition switch and the vehicle will not start. We have power coming out of the switch to the pcm but no command coming out of the pcm....
2000 Chevrolet Express 3500 7.4L Misfire, MIL Lamp on VIN: 1GBJG31J9Y
Customer came in with this class C motorhome 7.4 engine with a check engine light on. check codes code p0300 random cyl. misfire found #1 cylinder showing misfires and #8 showing some misfire counts but not as much. Scoped tested vehicle found that plug wires ... Trouble codes: P0300
2001 Chevrolet Silverado 2500 6.0L abs control unit VIN: 1GCEK29UX1
hey fellow hair-puller-outers! i have a chevy truck here with a cranky a.b.s. system... occasionally (sometimes commonly) the abs is activated and all three wheel speeds match on data from 20 m.p.h. right down til 2 m.p.h. where the scanner stops displaying ac...
2002 Chevrolet Impala 3.4L Starting, lighting, instrument panel VIN: 261WF52E32
This is a stumper for me. This car came in with occasional no start and interior and exterior lights flashing. When you open the doors with the ignition key on, the courtesy lights flash rapidly and the instrument panel goes crazy. The daytime running light sy...
2003 Chevrolet S10 4.3L Poor Idle Quality, Hesitation VIN: 1GCDT13X73
After the hard miss was fixed by the tune up the low power issue is still present. The truck will barely pull on to a drive-on lift. Power braking (push both brake and throttle to the floor) the engine won't go over 1000 rpm. I scoured IATN and found that so... Trouble codes: P0300 (Random Misfire)
2003 Chevrolet S10 4.3L Poor Idle Quality, Cuts out, Stall VIN: 0123857013
truck stalled in driveway for customer, picked up, started right up and drove until stalled a mile from shop would start and backfire a little with very low idle 2-300 rpm Code PO101B was in the computer replaced maf sensor and pigtail ran perfect for about 5 ... Trouble codes: P0101
2004 Chevrolet C5500 Kodiak C5U042 6.6L can only go 30mph VIN: 1GBE5C1114
Unknown history, other than the alternator was recently rebuilt. The speedometer registers about 80 mph when you are only doing 30 or 40. Then the governer kicks in and doesn't allow faster speeds. The various modules, PCM, ABS, all indicate the same speed as ...
2005 Chevrolet Equinox LS 3.4L Cooling fan VIN: 2CNDL13F85
Vehicle came in with cooling great at cruising speed but at a stop or in town driving the a/c did not cool. We found that the high cooling fans were not coming on. At first we thought it might be the control head and we replaced with dealer and had no change. ...
2006 Chevrolet Express 3500 4.8L R.H. Wheel speed sensor circuit VIN: 1GCHG39V56
Vehicle came in with ABS light on steady. Retrieved DTC C0040 R.H. front wheel speed sensor circuit fault. Cleared and drove vehicle while graphing. R.H. wheel speed signal erratic. DTC re-entered every time restarting vehicle. Inspected harness. Found No prob...
2007 Chevrolet Suburban 1500 LTZ 6.0L rear lift motor VIN: IGAFK16387
the rear lift motor wont come on when i look @ data pertaing to this door it shows no change to any data to this door lock or un lock open or closed
2007 Chevrolet Tahoe LT 5.3L No Start VIN: 1GNEK13067
Hi, we have a Tahoe here that has turned into a real problem child! Our customer went to start it one day & it wouldn't crank so they tried to jump it. Still no crank! They then had it towed to our local Chevy dealer because they thought they had some warranty... Trouble codes: U0121 (Lost Communication With Anti-Lock Brake System ABS Control Module), U0140 (Lost Communication With Body Control Module), U0100 (Lost Communication With Engine/Powertrain Control Module ECM/PCM), U0073 (High Speed Communication Bus)
1998 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WP1217W
Hello, and Thank you for your time. Customer Brings in the car with SES on, code P0122. He has replaced the TPS twice. After clearing the code, It takes about two weeks for the code to reappear. With the code cleared, you cruise down the highway at about 50m... Trouble codes: P0122 (Tps sensor circuit low voltage)
2000 Pontiac Sunfire SE 2.2L Cuts out VIN: 1G2JB1247Y
Hi I have this 2000 Pontiac Sunfire That came in with a crank sensor error. The car will start and idle fine but when you give it any gas it will stall and set the crank sensor error.The customer put new plugs, wires, coils, and an ignition module on it and ha... Trouble codes: P0336
2005 Pontiac Aztek 3.4L shift lever VIN: 3G7DA03E85
Hi guys I don't work with this interlock system at all. On this sometimes the shifter will not move and then the next time you try it it works just fine. Sometimes when trying it the brake pedal does not need to be pushed and the lever will move. But most of t...
2003 Saturn L200 2.2L No Start, Cuts out, erratic guage readin VIN: 1G8JU54F43
Thanks in advance for any help offered. This one is interesting. Vehicle problem became noticible when speedometer stopped working (intermitant condition). Shortly after, vehicle had intermitant start-up problem (ultimately starting). Wrench light would illumi... Trouble codes: U1000 (Class II serial data link malfunction), U1088 (Lost Com. with SDM), U1016 (Lost Com. with ECM), P1631 (Theft deterent fuel enable signal not correct), P1599 (Engine stall detected)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Regal LS 3.8L Stall, MIL Lamp on VIN: 2G4WB52K8W
Well, it seems like we can ship this one finally. many of you hit it right on the head, we had a damaged wire from previous valve cover gaskets we changed. on the front valvecover, the 3x reference wire had a small pinch which had exposed the wire, and just so... Trouble codes: P0706, P1361, P1362, P1374.
1989 Chevrolet S10 2.8L Manual Low VIN: 1GCCT14R6J
The input drum was broken and causing the binding. Also found that the governor valve was stuck. Replaced input drum and governor and so far all is good. Thanks for the replies.
1995 Chevrolet C3500 7.4L not switching fuels VIN: 1GKC34N5SJ
Thanks,Ernest and Ron for replies.It looks like I will need just a DPDT toggle switch to interrupt the gasoline fuel pump, and as Ernest pointed out, two relays to deactivate the TBI injectors.The propane system is not yet fixed as supervsors haven't decided y...
1996 Chevrolet Monte Carlo LS 3.1L Stall VIN: ZG1WW1ZMXT
The problem turned out to be a faulty new ignition module. Thanks to those who responded.
2003 Chevrolet Tahoe Z71 5.3L acuator VIN: 1GNEK13283
dave you were right customer was workin under the dash hooking up some aftermarket stuff and one of the plugs on the right side of the dash became un seated thanks for the help calibrated the doors like it said on all data and everything started workin properl...
2006 Chevrolet Malibu LS 2.2L shift VIN: 1G1ZT51F56
Thanks to all that replied. had some great tips.We drop the trans valve body and clean it out (wasnt dirty). Road test, code took a while to come back. We notice that on harsh driving it tends to shift rigid and thats when the code will pop up. So we pour in a...
2004 Pontiac Grand Prix GT2 3.8L ABS brakes VIN: 2G2WS52264
Took a [...] time to diagnois, customer took vehicle on vacation w/ problem not fixed. This vehicle does not have removeable sensors to take apart and clean, not an option. Vehicle would not set a specific hard code even testing 3 different appointments in the ...
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