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Prev Professional Automotive Repair Technical Discussions for April 29, 2009
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Open Help Requests for GM
Help Request Answers
2004 Buick LeSabre Custom 3.8L starter VIN: 1G4HP52K24
Towed in. No Start. No crank. When you turn on the key, you get a service engine soon lightbut no other dash lights. No radio, no power windows. Power seat works. Check all fuses ans battery connections. Get crank signal in and out of pcm on yellow wire, but n...
1991 Cadillac DeVille 4.9L pass key system VIN: 1G6CD53P2M
i am asking if the pass key system can be bypassed. the car is not worth putting much money in but the customer needs a car.if anyone can tell me i would appreciate it. also where is the pass key decoder located? thanks larry
1993 Cadillac Fleetwood 5.7L Starting VIN: 1G6DW5272P
Techs: Central Control Module is not allowing fuel enable due to bad module and is no longer there a way to bypass fuel enable on this...I thought the DK/Blue on pin B1 is grounded allowing fuel but seems to be more to it than that...thanks for ...
1993 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CT53B7P
My forehead is sore from beating against the wall... This should have been cut and dry (right??) The Code 52 for "Memory Reset" can be caused by changing the battery, a dead battery, loss of power to the ECM (an ignition feed going open for example) or ECM/Pr... Trouble codes: 52 (Memory Reset)
1994 Cadillac DeVille Concours 4.6L Cuts out VIN: 1G6KF52Y8R
Engine HOT light comes on intermittently. Coolant temp on scantool reads 210-220 then jumps up to 304 for a 2 to 5 seconds At this time engine runs very rough or dies. The coolant temp sensor was replaced about 4 months ago for this problem by the customer. Pr...
1994 Chevrolet joy 2.2L No Start VIN: YV1LSW59AB
This is a mexican vehicle, as best as I can find, an Opel corsa, vauxhall corsa and or Chevy joy. I am an american tech, trying to do a good job. There is no power to the fuel pump, if I power the fuel pump, it runs, the fuel pump, but still does not start, ar...
1994 Chevrolet K2500 5.7L stuck in 3rd gear VIN: 1GCFK24K2R
I have this 94 truck that is kicking my rear. It is stuck in 3rd gear, it has reverse, and manual second. I have checked the shift solenoids, checked for power at the pink wire at trans, replace ignition switch, and replaced the pcm. The condition has not chan...
1995 Chevrolet Corvette 5.7L No Start VIN: 1G14422P7S
Hello GM tech's. This Corvette has spark, compression, fuel pressure and injection pulse. Cranks over at a normal speep and sounds like it has compression. This is one of those half breed OBDI with an OBDII connector. Every so often the engine does run backwor... Trouble codes: 24 (vss), 34 (map), 44 (Lean Exhaust), 54 (Skips over)
1996 Chevrolet Blazer 4.3L Hesitation, Cuts out VIN: 1GNCT18W4T
Good customer, good thing! I haven't given up on this but I would like to! Breif history...Last fall, towed in, no fuel-replace pump and wire harness to pump, towed in again in January, removed 1+ gallons of water!(vehicle vandalized). We replaced pump, flushe... Trouble codes: P0131, P0151, P0155, P0420
1999 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy
truck came in no start fuel pressure good and did not have spark, checked vehicle had code for high voltage at ignition module checked did not have crank reference from pcm. crank reference to pcm from crank sensor good ohmed wire no short or open replaced pcm... Trouble codes: P0321
2004 Chevrolet Express 3500 LS 6.0L abs VIN: 1GAHG39U74
HI Techs Need help, This Van while driving at idle speed's left fron wheel will try to lock up when turning the wheel activating the abs when im not even pressing on the brake pedal it will only do it when i am turning the wheel back and forth while moving for...
2001 Pontiac Montana 3.4L No Start, Cuts out VIN: 1GMDX03E71
this vehicle will tend to stall and not restart when hot intermitantly. sometimes we can leave it run for 3 hours and it's fine, next time just start it up and after a bit of driving it stalls. during which there is no spark. has fuel pressure. there are the 3... Trouble codes: P1189 (Engine Oil Pressure circuit)
2006 Pontiac G6 2.4L poor performance VIN: 1G2ZF55B46
A fun one here! Vehicle idles fine but when trying to drive or even sitting if you press the throttle to raise rpm it just stumbles and will not reach over 4000 prm, even at WOT it just buffets if you will. There are no codes. I cannot even try and get it to s...
2001 Saturn SC2 1.9L MIL Lamp on VIN: 1G8ZY14761
Thanks for all your help in advance.This saturn runs great, but the check engine light comes on intermitt p0341 I know from reading about this car it has no cam sensor. Uses #1 firing cyl to syn. Any addvice. Trouble codes: P0341
2002 Saturn L100 2.2L MIL Lamp on, BCM VIN: 1G8JS54F32
We replaced the BCM and used GM web site for down load and reflash- The program did not appear to be a complete one as we could not enter new milage. The air bag light was on and had a code B1001 - option configuration error. I took the car to the dealer to up... Trouble codes: B1001 (configuration error air bag)
2004 Saturn Ion-1 2.2L Steering VIN: 1G8AG54F94
This car comes from a body shop. Power steering will only work for a few seconds then goes away (after a click noise under dash is herd). When you recycle the key it will again react same as before. Pulled codes C0475 and 476. Scan data Battery voltage is good...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22P2S
Thanks for all the great responses. They were very usefull to help me understand some problem areas on these engines. I can report the car is running but how i got there turned out to be something i would not have thought was the problem based on what i thoug...
2000 Chevrolet C2500 5.7L abs module, master cyl VIN: 1GCGC24R4Y
Thanks to everyone who replied to this post! This is the first time I've ever had one of these abs units fail. We blocked everything off until we finaly got down to it. Customer ended up telling me that he had put front pads on this truck 6 or 8 months prior, ...
2003 Chevrolet Silverado 1500 5.3L shift motor VIN: 2GCE19T531
We replace the t-case module and had to reflash. We tried used module but did not work(could not reflash, as our lap top went down). Went with O.E. module and had dealer reflash. All okay again. Thanks I.A.T.N. MEMBERS.
2003 Chevrolet Impala 3.4L Starting VIN: 2G1WF52E23
guys , i got lucky on this one. i finally got this car to act up. all i had to do was let it sit in the sun for a little while. then voila! no start , no gauges and radio locked . i already had bcm un mounted so i held key in crank position and performed the...
1997 GMC Pickup K2500 7.4L CKP sensor reluctor
The overall consensus seems to be that the reluctor gear is reusuable. Some said it can be easily damaged, but they reuse on a regular basis.It is a powdered metal gear, so using an appropriate pulller and going back on carefully seems to be the key. Thanks f...
1998 GMC Jimmy Envoy 4.3L rear rotors VIN: 1GKDT13W7W
Sorry guys it took so long toclose I was out for a couple weeks. But after diagnosing the brakes I found that the calipers were binding just enough to stay on enough to burn. Replaced calipers and all is good. Thanks to all for your input.
2002 GMC Envoy SLE 4.2L MIL Lamp on VIN: 1GKDS13572
Hello all Thanks for the replies,they were very helpful.Cleaning the throttle body fixed the stumble off idle and since i am a foreign specialist i dont have the tool to reflash the PCM.I sent the customer to the dealer and they left happy to have the probl... Trouble codes: P420.
1991 Oldsmobile Cutlass Supreme SL 3.1L Hesitation VIN: 1G3WS54T9M
all great replys replaced fuse and cleaned maf car runs great thanks for all replys
1999 Oldsmobile Silhouette Premiere 3.4L heater VIN: 1GHDX03E7X
Blend doors worked. Heater core was not plugged. Temps going in were 200 and comming out were 190. The problem that we have concluded was there was not enough flow through the system to allow the heater core to put out a sufficiant temp. our solution was to in...
1999 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK527XX
We "sort of" fixed the car. As we suspected, this used PCM was from a vehicle equipped with ABS and was placed in a vehicle without ABS. We took the car to the Saturn dealer and had the module re-coded for this car. Afterwards, the ABS code was eliminated, ... Trouble codes: 1602 (No communication between PCM and ABS control unit).
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