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Prev Professional Automotive Repair Technical Discussions for March 2, 2009
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1994 Cadillac Seville SLS 4.6L Surge, Stall, MIL Lamp on VIN: 1NJ75SDY98
This car came in with the AC not operating properly. It would not stay on Auto with the AC on. Repaired the AC system and reassembled. Reconnected the battery and now the vehicle stalls and sets a code P0083 24X Reference signal high. We have disconnected the ... Trouble codes: 0083 (24X Reference signal high)
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1991 Chevrolet R3500 Silverado 7.4L lock up VIN: 1GCHR33N3M
some thing is commanding pcm to apply torque converter lock up to go on and off causing vehicle to surge while driving at steady speeds on freeway. does anyone out there know what might be causing this. no dtc code, no check engine light on.
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1998 Chevrolet Cavalier 2.2L speedometer VIN: 3G1JC5241W
customer came in with speedo not working checked vss and connector all looks good used test vss to confirm still not working all data shows 2 wires going from vss to pcm no other connections should there be reference signal or is this a voltage generater type?...
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1999 Chevrolet Blazer 4.3L hvac VIN: 1GNDT13W7X
This Blazer has auto hvac. Sets code B0408, B0415, B0416. With temp knob in any position and blend knob in any position, the blower motor (in any speed position) will move from high to low. If blower is high heat will come out, when it automattically switches ...
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1999 Chevrolet C1500 Suburban 5.7L MIL Lamp on VIN: 1GNEC16R4X
vehicle come back 2 days later with same po410. no blown fuse. fired up pump, and can hear pump come on, removed out flow hose, and felt no air pumping. remove casing of pump, and found propeller stripped from motor shaft. naturally thinking faulty new delphi ... Trouble codes: P0410
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2000 Chevrolet Silverado 1500 5.3L 2-3 shift VIN: 1GCEK19T1Y
Hello folks. Bear with me here. This 4L60 transmission does have P0748 (EPC code), but I think it also has other problems. The shift solenoids "A" and "B" are sequencing properly for each gear, 1 to 2 shift ok if a bit harsh, but when shifting second into thir...
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2001 Chevrolet Impala LS 3.8L abs VIN: 2G1WH55K21
This car will set code c1232 left front wheel speed sensor open or shorted.c1233 right front sensor open or shorted and c1248 drp disabled.We have watched each wheel speed sensor and they read right.fixed broken wires and installed gm bearings in both front wh...
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2001 Chevrolet Impala 3.4L MIL Lamp on VIN: 2G1WF52E51
Hi I have 2001 Chevy Impala 3.4L with a code #PO401 EGR flow Insufficient Detected, a EGR valve has been replaced twice no vacuum restriction or leaks are found on it wiring harness appears ok after clear codes the PO401 code appears under 39 to 41 mph. during...
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2002 Chevrolet Trailblazer LS 4.2L piston slap VIN: 1GNDT13S52
Hi folks, this is a request for shared experience based on the 4.2L piston slap condition. This customer wants to know if remaining service life can be determined for her Trailblazer engine. We have confirmed piston slap and see minor scuffing on the #6 cylind...
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2004 Chevrolet Tahoe LS 5.3L Electronic VIN: 1GNEK13Z84
Hello Fellow techs.I have this vehicle that came in with traction control system disabled message on dash.Traced that problem to a bad BPMV replaced it but not the ebcm for it. The system was working fine but now the customer complaint is on dry pavement when ...
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2004 Chevrolet Blazer LS 4.3L security VIN: 1GNDT13X94
Hello to all GM techs... We are blessed with a 2004 Chevy Blazer which has a security problem. Approximatley 10 months ago and 8K miles... this customer came in with codes B2960 and B2961 in the BCM complaining of an intermittent no start and security light....
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2006 Chevrolet Colorado LT 2.8L tire wear VIN: 1GCDT196X6
18k miles and inside and or outside of tires show excessive wear. we have several of these trucks in our fleet and they all wear the tires early. does any one know why they are eating up the tires and will a z-height adjustment be necessary. all front end comp...
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2002 GMC Savana 2500 5.7L won't run on CNG VIN: 1GCGG25R52
I have a customer who just bought an "ex" government vehicle. It is a 2002 GMC savanna 2500. It is a bi-fuel (CNG/Gasoline) vehicle. The vehicle is only running on gasoline. I believe there is an electrical problem that has to do with the selector switch. It i...
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2002 GMC Envoy SLE 4.2L coolant Leak VIN: IGKDT13532
Coolant Leaking from front timing change cover, above and below head gasket line. Question being if replacing timing chain cover gasket will fix the Coolant Leak, or is the head gasket the problem with the leak??
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2007 GMC Yukon Denali 6.2L MIL Lamp on VIN: 1GKFK63817
I have a 2007 GMC Denali that has a code po121 throttle/pedal position sensor A circuit range/performance.No other codes were present, pending or otherwise. The check engine light will go off after a certain period of time , then back on again.It can take a fe... Trouble codes: P0121
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1995 Oldsmobile Cutlass Supreme SL 3.1L No Start, Misfire VIN: 1G3WH52M2S
This car came into our shop for a motor replacement. We ordered a motor from a reputible dealer here in town that we have had dealings with in the past without any problems. The replacement motor looked real good to all of us here in the shop, but when it came...
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1996 Oldsmobile Achieva SL 2.4L thermostat VIN: 1G3NL52T6T
Original scan tool data had code for taking too long to warmup. Removed exhaust to access t-stat housing and found thermostat missing, I am unsure exactly how the thermostat goes in. It appears to fit better pointed towards the radiator which is upside down. I...
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2002 Pontiac Grand Prix GT 3.8L Int. will go dead VIN: 1G2WP52K02
Customer brought the car in and said that it needed a new battery. Checked the battery and tested the the charging system. After completing the test, the charging system and battery passed. I found that it had a drain in the system. Pulled fuses and found when...
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2002 Saturn SL 1.9L clutch VIN: 1G8ZF52892
this clutch was replaced with OE clutch at 90,000km by my shop. The customer has owned the car since new, no kids driving. The car left and everyone was happy... Car shows up again slipping with the clutch engaging at the top of the pedal, removed transmission...
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Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac Escalade EXT 6.0L Hesitation VIN: 3GYEK62N84
This was a very embarrassingly simple repair,it was all in the abs,traction control and not in engine management at all.Edward from Virginia suggested turning off the traction control at the button and take it from there and that did the trick.All of the pr...
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2000 Chevrolet C3500 7.4L No Start VIN: 1GSG123456
I'm sorry for the delay.I was in Kenya for 2 weeks.I replaced the ignition switch and every thing is now working like it should.thank you very much for all the replys.
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2000 Chevrolet Tahoe 5.3L Speedometer VIN: 1GNEC13TYR
Guys thinks for all the help found to be pcm customer declined to fix vehicle
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2000 Chevrolet Tahoe LT 5.3L Poor Idle Quality, Misfire VIN: 1GNEK13T3Y
truck is fixed done all checks compression [...] pressure tested cat. injector test showed number #4 to be promblem injector, then smoked system, intake leaking alot. replaced intaked gasketts and #4 injector no more misfire cycles. changed plugs and wires also...
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2004 Chevrolet Silverado 3500 6.0L reduced engine power VIN: 1GBJC34U54
The vehicle is fixed, turned out to be a ground wire that is part of the throttle actuator control module circuit. It was located at the a/c housing on the passenger side underhood. Trouble codes: U107.
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1996 GMC C1500 Sierra SL 4.3L covertor 1 and 2 shift selenoid shift timming sele
hi guys first off a big thank-you to iatn and all those whoos part of this orginatation and evry one that replied got the truck to act up on me checked fuse 20 trans fuse and bingo had 5.4 volts also check at pink wire at switch and trans had 5.4 volts replac...
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2001 Oldsmobile Alero GL 3.4L lifters VIN: 1V2C3G456G
hello folks, thanks for all the advice. i didnt have time to soak overnight so i went with the oil can technique. i found that if i applied good steady pressure by hand for a few secs that the lifters with no preload would eventually bleed down into preload sp...
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1999 Pontiac Grand Am SE 3.4L Starting VIN: 1G2NE52E9X
THIS CAR IS A NIGHTMARE. I HAVE DONE EVERYTHING SUGGESTED AND DIDNT FIX ANYTHING WITH THE EXCEPTION OF THE SECURITY LIGHT. I CHANGED IGNITON MOD, BOTH CRANK SENSORS, MASS AIR FLOW,LOCK CYLINDER AND HOUSING,FUEL FILTER, CHECKED TEMP SENSOR, FUEL PRESSURE AND V...
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2005 Pontiac Vibe 1.8L Hesitation, MIL Lamp on VIN: 5Y2SL63845
Thanks to the 4 who replied to this one. We took another look at the connector to the TAC and found some corrosion there. Since the second replacement module made the car run well but allowed the lamp to come on, we felt that one of the connections might have ... Trouble codes: P2103 (Throttle Actuator Control Motor Circuit High).
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2002 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63B62
THANKS TO ALL WHO REPLIED. MOST OF YOU SAID TO RETIGHTEN THE INTAKE BOLTS AS PER A TSB. JUST BEFORE I WAS ABOUT TO DO THIS I DECIDED TO CLEAN THE MAF. ALL CODES ARE CLEAR SO FAR ! ABOUT 200 MILES AND ALL READNESS CODES ARE SET !! SO FOR KNOW IT SEEMS OK. IF N... Trouble codes: 0171 (lean bank 1), 0174 (lean bank 2).
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