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Professional Automotive Repair Technical Discussions for July 30, 2009 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 2002 Buick Century Custom 3.1L 1-2, 2-3 shift VIN: 2G4WS52J12 This Buick doesn't set any codes, but does not shift correctly. It is stuck in 2nd gear. It won't shift manually or automatically from 2nd gear. I disconnected the electrical PCM connector to the transmission, but no change. The fuse #26 for the TRANS is good ... |
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| 1999 Cadillac Seville SLS 4.6L No Start VIN: 1G6KS54YXX Vehicle came in with a start stall after 2 seconds. I have no communication with pcm. I can communicate with all the other thirty modules but it seems I have a code U1255 loss of communication in all other mods. I have tested for power and ground at pcm and al... Trouble codes: U1255 (Communication error) |
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| 1988 Chevrolet C1500 Cheyenne 5.7L Volt gauge VIN: 2GCDC14KXJ 1988 C1500 2wd 5.7L in for poor performance not driveable. Noticed low volts on gauge in dash reading 9.5V. Tested fuel pump. Fuel pump bad. Parts on order. Reads 9.5v at pump harness same as gauge. Tested Alt and Batt both good. Batt and Alt read 12.39V. Chec... |
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| 1998 Chevrolet C3500 Cheyenne 7.4L Misfire VIN: 1GBKC34J6W This thing has a missfire on cylinders 3,5,and6. It does not miss on all of them all of the time. It misses most on 6 at idle and more on 3 at higher rpms. i have swapped plugs, wires, and injectors around. It always stays on those 3 cylinders. I have also rep... |
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| 1999 Chevrolet C1500 LS 5.0L No Start VIN: 1CGEC14WXX This truck was a dot inspection .I drove it in the shop,then a no start.I have 0 injector pulse on the modis ,no codes .Intermittently 26ms injector pulse after extended cranking.65 psi fuel pressure,spark etc.cts@normal readings tps @ normal readings.@ the in... |
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| 2003 Chevrolet Trailblazer LTZ 4.2L MIL Lamp on VIN: 1GNDS13S83 I can clear this code out and it will come back after 5-10 minutes of driving, vehicle runs good until you turn on a/c then it idles up and down to the point it almost kills engine. Customer has been driving vehicle with this code since winter. In fix database... Trouble codes: P0105 |
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| 2004 Chevrolet Silverado 1500 5.3L Wipers VIN: 1GCEC14T64 Wipers sometimes fail to turn off after use. has failed three times but will not fail at our shop.Another shop taught lady customer to remove fuse.After cool down they work normal.Don"t have time for long road test. I'm guessing control module but can"t prove ... |
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| 2006 Chevrolet Optra LS 2.0L Stall VIN: KL1JD69Z06 HI EVEYRONE, ive got this optra5 here and customer is complaining that every now and then the vehicle will feel as if it is going to stall or suddenly when she is driving she does not have any power to the accelerator pedal while driving. i pulled the code p0... Trouble codes: P0705 (transmission range/low input) |
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| 2006 Chevrolet Aveo LS 1.6L Hesitation, MIL Lamp on VIN: KL1TD66656 Customer complained about a small hesitation when acceling from a cruise. I drove the vehicle and experienced a slight hesitation from a stop one time. The code p2135 comes and goes. She left it with me a week while she was out of town the light of course went... Trouble codes: 2135 (throttle/pedal postion sensor/switch a/b voltage correlation) |
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| 2008 Chevrolet Suburban 2500 LT 6.0L Misfire VIN: 3GNGK26K18 This 08 Suburban has misfire counts on cyl #4 only at idle. Smoked intake - no leaks. Tried new plug and ignition coil with no difference. Swapped injectors and plug wires between cylinders and still cylinder #4 misfires at idle. Any ideas? Trouble codes: P0304 (Cylinder 4 - missfire detected) |
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| 1985 GMC m/h p chassi 7.4L temp gauge s/hot VIN: 1GBJP37W1F After intake and thermostat installed customer came back and stated that the temp gauge climbed to 3/4 up the gauge. while climbing up a hill. On a flat road temp stay approx. just over half. Installed mechanical gauge, let vehicle idle temp at 210, slight rpm... |
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| 1999 GMC Sierra 1500 SLT 5.3L MIL Lamp on, p1153 Or p1133 VIN: 2GTEC19T3X The o2s have been replaced and the monitors will set with no issues after the customer drives for couple of days codes come back! Somtimes 1153 And at others 1133 not both at same time!! Trouble codes: P1153, P1133 |
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| 2002 GMC Sonoma SL 4.3L floor VIN: 1GTCS19W32 has anyone run across these before |
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| 2002 GMC Envoy XL SLE 4.2L HVAC system VIN: 1GKET16SX2 Customer states intermitant A/C not cold, started 1-2 weeks ago. Will work ok one day then not the next. May work, or not work from one errand to the next or may work fine for days w/o acting up. Of course it works fine today. Temps here have only been in low ... |
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| 2005 GMC Envoy SLE 4.2L No Start, Cuts out, Stall VIN: 1GKDT13S55 The envoy came in on the back of a tow truck) customer stated that it cut off on her while driving. kinda fell on its face she said. it cranks and most of the times it catches for a second and it dies again. we got codes p2135, p2119, p2101 and p1516. i'm susp... Trouble codes: P2135 (tps 1-2 correlation), P2119, P2101, P1516 |
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| 1994 Pontiac Grand Am SE 2.3L No Start VIN: 1G2NE1533R Hi Fellas, We have this Grand Am that came in on a hook. Checked for codes and found none. All engine data looks good except for no rpm signal while cranking. We also found no spark or injector pulse. Customer stated that crankshaft sensor and icm had been re... |
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| 2004 Pontiac Grand Prix GT2 3.8L runs hot? VIN: 2G2WS52294 hi looking for some info on this car. customer came in saying the car overheated,temp message on cluster came on and went into some sort of limp mode. i had to jump car and ended up replaceing a bad cell battery. ran car in service bay temp climebed to 220 deg... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1996 Buick Riviera 3.8L column VIN: 1G4GD2218T Thank you all for the great replies. Knurled the pins some to make it fit tighter and staked the hole around it. I notified the customer that we may have to replace the components if it becomes a problem later. Thank you agian for the quick responses. |
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| 1999 Cadillac DeVille 4.6L no starter WELL SOMETIMES I PUT THE CART BEFORE THE HORSE. I READ ALL THE FIX DATA BASE AND SAW THAT THE IGNITION CYLINDER WAS PROBLEM IN MANY CASES. I PUT SCANNER ON AND SAW THAT THEFT SYSTEM WOULD GO TO RUN WHEN SWITCH MOVED AND THEN TO CRANK AND THAT IS WHAT HAD ME FO... |
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| 1982 Chevrolet Corvette 5.7L Poor Idle Quality, Misfire VIN: 1G1AY8784C Well thanks for all the replies on this one the problem was that the throttle body plates were not in sink someone removed the adjusting plugs and messed with them causing the idle to go up and down. after that when propane was injected into the throttle body ... |
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| 1995 Chevrolet Blazer 4.3L No Start, Misfire VIN: 1GNCT18W4S Thanks for all of your replies, the Blazer is fixed. Let me start by saying that I reverified the distributor and cam were correctly indexed. I replaced the distributor with a recycled one and still had the same problem. The final fix was to install a recycled... |
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| 1997 Chevrolet C1500 Cheyenne 5.7L brake lights VIN: 1GCEC19R0V thanks to chris/michael/bryan/long/rick/andy/bryan/matt for your replys.david from az nailed the problem.the truck came in with the wrong power brake booster installed.the booster rod that hooks to brake pedal is different and will cause brake switch to stay o... |
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| 2000 Chevrolet Silverado 1500 4.8L 2 - 3 shift VIN: 1GCEK19EV5 The problem was the PCM, it had a internal short to ground for the solenoid. Kent (KP) from Fort Myers Florida came down to my shop and helped me out, he spent half an hour with me and problem solved. I was beating my head into a wall for a little while, but ... |
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| 2002 Chevrolet Silverado 2500 HD 6.0L air bag VIN: 1GCHK24U63 Thanks to those who replied. After replacing the airbag module with a known good module from a different vehicle, checking all plugs, wiring and fuses. I sent it to the dealer because my scanner could only read the airbag codes and the next step in the service... |
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| 2003 Chevrolet Trailblazer North Face 4.2L Hesitation, Surge, MIL Lamp on VIN: 1GNET16S53 I'm closing this as an Non-repaired. I seem to be chasing a ghost.At one point in my repairs,I would not have any codes,and Service Lite,So I thought "Its repaired" (not). The lite comes back on and the same redundant codes come up,Yes I have unplugged sensors... Trouble codes: P1635, P1221. |
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| 2003 Chevrolet Express 3500 6.0L Misfire, MIL Lamp on VIN: 1GBJG31413 Thank You to all that replied IT WAS THE INTAKE MANIFOLD GASKET We bought a used smoke machine it was a demo from pep boys we smoked it and found the intake leaking we were trying not to buy one but I got it for $750.00 I saw them on e-bay for that price ... |
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| 1994 GMC K1500 Sierra SL 5.7L Surge, Stall VIN: 2GTEK19K1R Thanks for all the help, I checked the grounds they were good, checked fuel pressure good also. I went back to the basics as Daniel said and found that the timing was off by a couple of degrees. I guess the chain had moved the distribitor while pulling the eng... |
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| 1997 GMC Savana 2500 4.3L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GTFG25W3V should have said B1 S1 o2 voltage KOEO 1.072 volts , replaced o2 wire to pcm problem fixed Good job william from wisconson |
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| 2003 GMC Yukon XL 1500 SLT 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GKFK16Z03 THANX TO ALL IT TURNED OUT TO BE THE CAT AFTER ALL I HAD DISCONNECTED THE CAT BUT FORGOT THE O2 WAS STILL PLUGGED IN AND IT WAS MESSING WITH ME STILL CAUSING THE MISFIRE,THANX AGAIN Trouble codes: P0300. |
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| 2006 Hummer H3 3.5L battery VIN: 5GTDN13626 Thanks for all the replies. Had to send this one out to the GM dealer. They found the On Star system causing excessive draw as it would not time out/sleep. Cusotmer drives this vehicle infrequently and does not use the On Star system so the dealer dissabled... |
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