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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 28, 2013
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Open Help Requests for GM
Help Request Answers
1997 Cadillac DeVille 4.6L speedometer VIN: 1G6KD52Y8V
Speedometer reads 0MPH always. All other functions of the ICP are operational. Handheld scanner shows the correct MPH reading at the PCM. Backprobing the VSS input signal at the ICP using the same ground as the cluster uses, the signal appears good. DVOM chime...
2003 Cadillac Seville SLS 4.6L Cluster display VIN: 1G6KS54Y93
Hello everyone, This Cadillac had failed inspection for no MIL light. Check over and identify failed bulb in cluster. Replaced cluster with re-manufactured unit and the mil light now works normal, got vehicle through inspect and after about the third start up...
2011 Cadillac CTS V 6.2L Electrical system VIN: 1G6DV8EP3B
Hey everyone, this car is a USA car in Canada, and customer has tried to get in for warranty and they refused due to car being written off in accident. here is the issue. -car starts up fine -car drives fine -intermittently the car will not shut off when yo...
1964 Chevrolet Corvette 5.3L shifter VIN: 40867S1170
Hi guys, I have this 64 corvette that came in to have a new clutch due to chattering. removed old clutch and install new clutch at that point noticed the shifter was out position and was lock will not move. Now this problem is related to the shifter only when ...
1994 Chevrolet S10 2.2L backfires when crank VIN: 1GBCS1046R
This is actually an LLV mail truck hence the low mileage and old age. It runs very well after it is started but when cranking, it backfires in the intake and/or jerks back against the starter. It is worse cold but it will act up just about anytime you try to s...
2001 Chevrolet Malibu 3.1L Poor Idle Quality, Surge, Cuts out VIN: 1G1ND52J81
Intermittant cut-out, almost stalling only at idle mostly when in gear stopped at a light. Vehicle runs fine on road all the time, however will almost stall and has a hard cut-out when your stopped at a light. The cut-out feels like a totally shut down for a s...
2002 Chevrolet Silverado 2500 HD 6.6L Surge VIN: 1GCHK23152
This truck starts a hard surge at idle (almost stall) when coolant temp reaches 140 deg. What i see is happening is the throttle plate slams closed for a few seconds then opens again just before it stalls. this cycle happens about 4 to 6 seconds apart. the egr...
2003 Chevrolet Silverado 2500 6.0L drivetrain VIN: 1GCHK24UX3
Hey all, This is a farm pickup set up for hauling trailers occasionally. Customer brought it in with an intermittent noise that sounds like stripped splines on the front driveshaft slipyoke. Of couse I checked all that first and couldn't find anything.I also ...
2003 Chevrolet Express 3500 6.0L MIL Lamp on VIN: 1GBJG31U33
viehicle came in because could not smog and has o2 heater codes i have never seen 3 heater circuits non opperational all have 12 volt reff for heaters but computer does not pulse heaters when ennabled have done bentch test and the heater circuit opperates on t... Trouble codes: P0135, P0141, P0155
2003 Chevrolet Silverado 1500 4.3L Hesitation, Misfire VIN: 1GCEC14X23
Misfiring on all cylinders check for vacuum on dipstick tube to see if intake manifold gasket leaking causing misfires-none check fuel pressure-55lbs install lab scope on crank sensor-ok install lab scope on cam sensor-random small spike at top of wavepattern ... Trouble codes: P0300 (Random multiple misfires)
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDS13S44
I have this one that keeps throwing up a P0410 code. The customer replaced the air check valve on the side of the cylinder head after doing his own research. First thing I checked was to see if air pump was coming on. It was, however, it wasn't as loud as I ex... Trouble codes: P0410 (Secondary air injection system)
2004 Chevrolet Silverado 2500 6.0L heat
After replacing heater core radiator thermostat and water pump all vents still blow cool. Top radiator hose is hot bottom radiator hose is cold. One heater hose is hot one warm I am a trans rebuilder and lost here Thanks
2006 Chevrolet Impala LS 3.5L evap monitor incomp VIN: 2G1WB58N96
Thanks to the lovely new drive clean system this vehicle will not pass its etest due to the evap monitor not running. it had a few problems as you can see from the repair history, those were all repaired at the begining of january and I have since been unable ...
2008 Chevrolet Malibu LT 3.6L timing chains VIN: 1G1ZJ577X8
Car towed for no start condition. Will not crank, customer installed new battery. Found engine will not turn over by hand. Oil is full, customer states car cranked over after installation of battery, but it cranked slow, then it stopped. Will a timing chain fa...
1998 GMC K2500 Sierra SL 5.7L Hazard lights VIN: 1GTGK24R9W
I checked all fuses and found blow fuse #1 for hazard power, changed, replaced flasher, replaced multifunction switch. When I use my meter on the flasher I can see it is making continuity when flasher button is pushed down. Directionals and brake light work OK...
2004 GMC Envoy XUV SLT 4.2L batt light VIN: 1GKET12SX4
car come in batt light on mesage display says batt not charging code po621 in memory replaced alt cleared code. light and code back on in 15 seconds,batt voltage on scanner 14.4 volts measured voltage at batt 14.4 volts yet batt light on and code resets
2000 Pontiac Montana 3.4L Misfire VIN: 1GMDX03E1Y
This is my own vehicle. Replaced head gaskets 1K ago and all was fine for a couple weeks. Then sometimes when cold the SES light would come on and a random misfire code would set. Could fine no misfire nor feel one. About 2 weeks of that and then start after w... Trouble codes: P0300
2007 Saturn Aura XE 3.5L # 3 Injector VIN: 1G8ZS57N67
Customer complains when first started unit has excessive white smoke and “putrid smell" from exhaust, No Check Engine Light On,, and when road conditions are wet traction light comes on, When we scanned system cold # 3 injector pulse width is out of range, com...

Fixes & Summaries for GM
Fix/Summary Answers
2008 Buick Lucerne CXL 3.8L Radio VIN: 1G4HD57218
We did use SPS to flash program the radio. There were no codes in the radio,body computer or the digital radio reciever. The clock on the radio would come on when you turn the key on. The main power wire was good the only other power the schematic showed was a...
1998 Chevrolet Tahoe 5.7L transfer case control module VIN: 3GNEK18R6W
its a 50/50 split on if its normal or not. customer has taken vehicle for now. one person asked if continually clicks which it does not do. seems like it is going thru a self test of the system.
1999 Chevrolet Lumina 3.1L Starting VIN: 2G1WL52M6X
IATN to the rescue!!! Doug [...] and others were spot on and pointed me in the direction of the passkey system wires that apparently have a history of breaking in the column. Installed a new lock cylinder and got the keys programmed and it drove out of he...
2001 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK29101
WE determined through extensive testing that this engine needs injectors. The owner is a recent graduate of the local community college diesel program, and will attempt it himself. This is what I learned; This engine will only crank for three seconds if it doe...
2007 Chevrolet Avalanche LTZ 5.3L variable lifters VIN: 3GNFK12327
2007 Chevrolet Silverado 1500 LTZ 5.3L ebcm VIN: 1GCEK19J07
well after another ebcm and no fix did some more investigating to see if ebcm was really awake or not.. I deceide to check for the momentary 12 volt reference to the front speed sensors, when i went check the left front ref.votage it had 12 volts (gray wire)on...
2011 Chevrolet Traverse LT 3.6L P/S Pum VIN: 1GNKRGED9B
First off, thanks to everyone for taking their time to help me with this. It is finally fixed. Most everyone agreed that is was most likely the pump. I changed the pump, completed the bleed procedure twice and all seems well. No more loss of assist. Thank...
1999 GMC Yukon SLT 5.7L No Start, Cuts out, Stall VIN: 1GKEK13R1X
Well I think this vehicle was a combination of issues. I was able to get the 175 amp fuse on the rad shroud to lose a connection while shaking it so I feel that was the major culprit causing the shutdown since it would power up the fusebox. The fuel pump relay... Trouble codes: P0141 (O2 b1s2), P0161 (O2 b2s2).
2006 GMC W4500 Forward W4S042 5.2L Hesitation, Cuts out, Stall, Misfire, no throttle response VIN: J8DC4B1677
Well, unfortunatley this one had to go to the dealer. I am not a diesel guy and this one got over my head real fast. I have a Launch scan tool with the latest updates and I can read the info well but I am not sure exactly what I am reading or if it is right or... Trouble codes: P0301, P0303.
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