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Prev Professional Automotive Repair Technical Discussions for February 11, 2013
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1997 Cadillac Seville STS 4.6L Cellular Telephone Module VIN: 1G6KY5294V
This car came in as a no start. I try to get codes no communication on any module. I did a voltage across pin 4 and 7 i had steady 4.8v. I know that i was suppost to a have a 0 to 7v square wave. I start disconecting fuses and when i took the radio/telephone f...
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2005 Cadillac CTS 3.6L brake lights VIN: 1G6DP56765
This Caddy came in with intermittant eratic trans shifts. Upon initial inspection, the brake lights were staying on in the rear with the key on. The red brake light, the TCS and ABS lights were on in the dash. There was a PO571 stored in the PCM/TCM and CO281 ...
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2000 Chevrolet Venture 3.4L Power Steering Pump VIN: 1GNDX03E2Y
Noise emanating from the power steering pump when RPMs raised above an idle speed. Noise is constant regardless of steering wheel position, although it gets somewhat louder when held against the steering stops. No foaming of the fluid is present. Noise is a wh...
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2003 Chevrolet Silverado 1500 5.3L transfer case VIN: 2GCEK19T13
have a good one. replace tcase and encoder motor. they were junk. now when shifting tcase to 4x4 4x4 light flashes can hear motor try to shift then 2wd light comes back on
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2006 Chevrolet Silverado 1500 LT 4.8L overheating VIN: 1GCEK19VX6
I have a fleet truck here belongs to a good customer of mine. Driver brought truck in because when sitting at a light truck temp guage will rise 3/4 or more comes back down when you go down road for aways.Low miles reagular oil changes and no codes. Thought ma...
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2006 Chevrolet Impala SS 5.3L Out Side Temp. VIN: 2G1WD58C46
We have replaced 2 heater control heads from gm, brand new. Part number [...]. Out side temp worked before repairs and after, all we get is ---, no temp reading. We drove the car over 30 miles and still no setting of temp. We can use our modis and see temp ...
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2009 Chevrolet Traverse LTZ 3.6L Engine Won't turn off!? VIN: 1GNEV33D79
Customer started car today noticed the Check Engine Light stayed on then noticed it wouldn't accelerate as well as she is use to so she pulled over turned the key off thinking turning it off & back on would help "reset something" (her words). She noticed when ...
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1997 Oldsmobile Cutlass 3.1L Coolant Reservoir VIN: 1G3NB52M0V
I have this Cutlass w/ a standard pressurized coolant reservoir on the passenger side of the engine bay. I have replaced the reservoir unit with a factory Delco GM OE reservoir 3 times already and they only seem to last about 2 months at a time. There has b...
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1998 Oldsmobile Achieva S 3.1L MIL Lamp on VIN: 1G3NL52MXW
We replaced the catalytic converter with an AP OBDII compliant converter. The code came back. We replaced the upstream oxygen sensor. The code came back after 40 miles. If we replace the catalytic converter with a Walker or a Magnaflow direct fit converter, do... Trouble codes: P0420
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2003 Pontiac Sunfire SE 2.2L Water Pump VIN: 3G2JB52F63
hello , customer brought sunfire in for coolant leak. changed water pump using ecotech water pump sprocket holding tool. now there is a whirring sound. took serpintine belt off and sound is the same. i had this before with a camry and it was the balance shafts...
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2004 Pontiac Vibe 1.8L Hesitation VIN: 5Y2SL62854
This vibe has a tip in hesitation. Leaving from a stop sign it will fall flat on its face. Once the car works its way through that it will accelerate up to speed and cruise down the road just fine. It idles just fine. There is no codes that are set. Data looks...
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2007 Pontiac Montana SV6 3.9L Cooling fans VIN: 1GMDU031X7
Engine cooling fans run contiously app. 1 minute after startup .Ac is off,no aftermarket remote start.No codes.Fans will run for 4 minutes after ignition is switched off.ECM will also stay powered up for 4 minutes after ignition is off. Transmission control mo...
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2008 Saturn Outlook XE 3.6L compressor VIN: 5GZER13788
When I push the A/C button the light comes on for a second and then goes out. checked system charge and it was low so I recharged it but it still will not engage. Checked clutch fuse and it is good. AllData has very limited info on this system for diagnosis.
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Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac DeVille DTS 4.6L Air bag VIN: 1G6KF57983
Hey guys, I replaced the drivers seat belt buckle with the pretenisoner. That fixcd the problem! I really do thank all of you for your help! Bill [...]
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1991 Chevrolet S10 Baja 2.5L Blower Volume VIN: 1GCCS14E3M
Hey, I'd like to thank everyone for taking their time and offering the suggestions. I took it back apart to find no blockages or door out of order. I tried a deeper squirl cage but wouldn't fit into the housing. I resealed the outer box and that seemd to hel...
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1994 Chevrolet S10 2.2L backfires when crank VIN: 1GBCS1046R
After posting my help request and spending four hours looking for the problem,the Post Office picked up the vehicle with a flat bed and took it to their regional repair center and I have not been informed as to what it took to repair it. My best guess would b...
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1996 Chevrolet K1500 Suburban LT 5.7L free revs VIN: 1GNFK16R8T
Thanks for all the replies, they were all very helpful. Fix wound up being that I had a dumb a#! Moment. I left the booster house UN hooked, couldn't see it due to my fender cover. A great learning experience though, sometimes just have to walk away and take a...
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2002 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK29152
Sorry for the delay, just wanted to make sure I didn't get a call back with a no start again. Kevin, Gordon and Matt are the big winners. Turns out that the ECM would lose the ignition 1 voltage upon cranking and only when cold. I verified this by backprobing...
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2002 Chevrolet Avalanche 1500 5.3L Rev?low VIN: 3GNEK13T22
Well JAy was correct on the valve body bolt. As careful as I was with the rebuild somehow I must of mixed up the bolts. I found no other damage other than the sun shell and the bot both were replaced and the truck is now back in the hands of the customer. Th...
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2002 Chevrolet Monte Carlo SS 3.8L Stall
Hello, I have fixed this vehicle. Thank all of you who replied with great responses. What i found was moisture to the top of the pcv valve. My MAP reading on the lab scope was at about 8in. hg. when it should have been at 10 in. hg. I couldn't see any differen... Trouble codes: P0101 (MAF sensor).
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2009 Chevrolet Express 2500 4.8L MIL Lamp on VIN: 1GCGG25CX9
The customer has not returned for further diagnosis. The problem is that the vehicle drives fine, so the customer is in no hurry to fix the vehicle. However, this is not the first time I have encountered this dtc. I want to get to the bottom of this so I kn... Trouble codes: P0121.
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1996 GMC K1500 Sierra SL 5.7L No spark VIN: 1GTEK14R3T
WELL AFTER READING ALL THE REPLYS WE GOT EVERY BODY SEEMED TO BELEVIE IT HAD TO BE EAITHER A BAD COIL OR CAP AND ROTOR WITCH IT WAS NIETHER OF. WE NEVER COULD GET A GOOD SPARK OUT OF THE COIL EVEN THOUGH IT HAD 11V CRANKING HAD A GOOD GROUND AND A GOOD TRIGGER...
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2007 Pontiac Vibe 1.8L No Start VIN: 5Y2SL65887
The fix was to repair the shorted injector wiring at number 4 cylinder. After finding nothing and opening this post, the boyfriend of the owner of the vehicle called to find out what was going on. He said that a couple of weeks ago, he put a serpentine b...
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