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Prev Professional Automotive Repair Technical Discussions for October 5, 2009
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue 3.8L blower VIN: 1G4CW53L4M
I have a 1991 buick parkave and it has a slider style heat control. It lights up when you randomly switch certain positions and turns off when you switch to others, the blower does not work, but when you maually power the blower it works fine. A dealer said th...
1997 Buick Skylark Custom 2.4L Poor Idle Quality, Misfire VIN: 1GNJ52T2VC
Customer brought back today for rough idle after driving this weekend, found code p0300 missfire so check plugs and coil packs, replace plugs due to wear. check vac and found 13" at hot idle. So I removed side panel to recheck my timing marks and they are what... Trouble codes: P0300
2003 Cadillac DeVille DTS 4.6L abs VIN: 1G6KF57983
Customer said the light came back on. Came back a couple days later with 1227, 1234 both for the left rear sensor and 1232, left front sensor open or shorted but the LIGHT WAS NOT ON. Checked signals, all looked great. Cleared the codes. Road tested about 5 mi...
1996 Chevrolet Blazer 4.3L No Start, no spark VIN: 1GNCT18W3T
Ok Techs..need some advice This 96 s10 Blazer looses spark whenever it sits outside for a bit..and its wendy and rainy. The culprit seems to be in the distributor cap.. Condinsation and corrosion.. Simply remove cap...scuff it for a few seconds reinstall and i...
1997 Chevrolet Tahoe 5.7L mil is on VIN: 1GNEK13R8V
This vehicle came in with a trans problem DTC p1870 Trans component slipping, we overhauled, that prob is fixed, but immediately afterward we got a MIL with DTC's p0102 MAF sensor ckt. low frequency, p0340 Cam ckt, These codes were NOT there before. We backtra...
1997 Chevrolet K3500 Silverado 7.4L all systems VIN: 1GCHK34XVZ
This truck was the cause of a fire that burnt out most of my shop last weekend. Supposedly an electrical short caused a fire at or near the steering column which spread to the entire passenger compartment and thru the firewall to the engine bay. Several techs ...
2000 Chevrolet Tahoe 5.3L front heat VIN: 1GNEK13T3Y
I have a 2000 tahoe that has good heat coming from the back unit and is controlled separate from the front. The front doesn't blow hot at all. The a/c works for both the front and the back. It is just the heat. Thanks in advance for any help.
2002 Chevrolet Impala 3.8L MIL Lamp on VIN: 2G1WH55K71
greetings to all this chevy set a code for the air injection system.i have checked the air pump and that functions i then checked the solenoid which supplies vaccum to the air valve and thats working.i removed the air valve and when there is no vaccum you cant... Trouble codes: P0410
2004 Chevrolet Corvette 5.7L Diff Leak VIN: 1G1YY32G44
We have here a 2004 chev corvette convertible. About 18 months ago, the vehicle came in for a large differential leak. We resealed the differential using the appropriate sealers and new axle seals. Refilled with gm fluid and the additive. Ever since... The v...
2004 Chevrolet Suburban 1500 LT 5.3L charging VIN: 3GNFK16Z84
Customer stated that bat. light comes on intermittently at idle & charge gauge drops. He also stated that this sometimes happens while driving on interstate. I verified this condition at idle & ran a scan with my Modis. Shows code P1637. When this happens, bat...
2009 Chevrolet HHR LS 2.2L air bag light VIN: 3GNCA63X19
here we have a 09 hhr that got a pretty good came to the our shop from a body shop with the air bag light i pulled the codes and it came up with a front impact circuit shorted to voltage.well i found the connector about a foot down the harness not...
2003 GMC Yukon XL 1500 SLE 5.3L Misfire, MIL Lamp on VIN: 3GKEC16Z73
This one is probably very easy for you GM Techs.All the right bank cylinders are miss firing .I found TSB 3056 in my ALLDATA , I swapped the O2 sensors position 1 it did not move the miss .The sparkplugs are black (like fuel enrichment problem). I have very go... Trouble codes: P0300 (Ignition misfire -mutiple)
1998 Oldsmobile Cutlass 3.1L Stall VIN: 1G3NG52M4W
Original complaint - high idle, stalling at traffic lights, hot engine. Verified high idle, was repaired with new IAC motor. Tried to perform idle re-learn procedure - engine stalls every time cooling fans kick on. Noted one fan was disconnected. Tested all gr...
1996 Pontiac Sunfire SE 2.2L pcm VIN: 1G2JB5249T
car was towed in for no start has sat for several months .have no spark injector pulse or fuel pressure .no communicatin with pcm but can communicate with air bag abs and instrument panel .have tried two pcms from napa that were flashed by napa .cant believe t...
1997 Pontiac Grand Prix SE 3.8L speedometer VIN: 1G2WJ52K3V
The speedometer quit working on this car. There are no codes stored in any module. The Vss reading on scan tool is present & correct. Sent cluster to repair center & it bench tests -ok- Re-installed & still no speedo. Checked wiring diagrams (Mitchell) and sig...
2001 Pontiac Grand Prix GTP 3.8L abs/traction control VIN: 1G2WR12171
Hey guys..I could use your help here. Car came in with ABS and traction control light on. It set codes C0550, C0244, C0450 and P1571 on the PCM side. We are aware that C0244 and P1571 are related and have flow tested that circuit with no positive results. Torq...
2002 Pontiac Sunfire SE 2.2L 1st to 2nd gear shift VIN: 1G2JB52F42
Only shudders after you drive on highway for about 5min or so above 70mph (engine @ normal opperating temp), and you come to a stop wait for about 3 to 5 seconds then you accelerate normal or aggresive doesnt make a difference it shudder/slips and occationaly ...
2006 Pontiac G6 2.4L Hesitation, Low Power VIN: 1G2ZF55B66
Need some help with this one. Starts and idles ok, out on road acts like it is lean, lazy, low on power untill around 3000 rpm. Checked fuel pressure, intake ductwork, MAF sensor, and intake for leaks. Exhaust is not restricted. When I disconnect the connector...
2000 Saturn SL2 1.9L Readiness Monitors VIN: 1G8ZK5272Y
Mil light works properly and goes off OK when vehicle is started. However, 3 readiness monitors will not complete. They are Catalyst, Secondary Air, and EGR. Have been driving this for weeks - no difference??? Trouble codes: P0341, P0404, P1599, P1620

Fixes & Summaries for GM
Fix/Summary Answers
2000 Cadillac Catera 3.0L MIL Lamp on, P0411 VIN: W06VR54R2Y
1985 Chevrolet Corvette 5.7L Stall VIN: 1G1YY0788F
Replacing the ECM fixed a longstanding pinging issue with factory base timing set. So that was a good thing. I didn't replace any ground wires because technically everything should have been fine. Replaced and indexed pickup coil with reluctor. FOUND ignit... Trouble codes: 42 (Electronic Spark Timing), 44 (Lean Exhaust Condition), 45 ( [...] Exhaust condition), 51 (Faulty or improperly installed prom), 53 (System over voltage).
1997 Chevrolet C1500 Silverado 5.7L 4x4 VIN: 1GCEK19R1V
It turned out to be the transfer case switch on the dash. If it was overnight cold it would work till it got warm and then would not work. I took the switch out of the dash but left it hooked up and if I held it in a certain position it would work (and the lig...
1998 Chevrolet S10 4.3L No Start VIN: 1GCCDS19X3
Happy Monday all! Thank you for all the quick replies! Almost all of you suggested a new OEM fuel pump, which by the way comes with a harness. We replaced that & the fuel pump relay (both directly from GM) and the truck seems fine. We had just recently repla...
2002 Chevrolet Tracker 2.0L compressor VIN: 2CNBJ13C92
Well thats how it is. If there is enough static air pressure in the system it will run the compressor to ruin. The new condensor has a new switch (and drier) with it. Installed a new compressor and all is fine.
2006 Chevrolet Monte Carlo SS 5.3L Hesitation, Stall, Misfire VIN: 2G1WL16C86
Vehilce left the shop and has not been back yet so that I could investigate some of the suggestions received. An appointment is in the books for the vehicle to return next week some time so then I will get to try some things. Thanks for all the help. Trouble codes: P0336 (crankshaft position sensor performance).
2006 Chevrolet Silverado 2500 HD LS 6.6L Speedometer VIN: 1GCHK29D26
Checked the signal at the pcm (good) checked at the IPC connector ( nothing). After following the schematic and realizing a few errors in it, I searched the wiring harness again and found that it splits into two gr/white. 1 goes to C/control brake assist etc, ...
1998 GMC K1500 Sierra SL 4.3L power steering pump VIN: 1GTEK19W0W
installed p/s pump pressure gauge p/s press ok. replace p/s actuator on rear of p/s pump. vehicle fixed.
2001 GMC Sierra 2500 HD SL 6.6L No Start VIN: 1GTHK291X1
Hello all, I am closing this request as time is running out & I will update you at a later date. I suspect injectors but i havent had time to follow up on the info I recieved. Thanks to all for your input.
2002 Oldsmobile Bravada 4.2L TransferCase VIN: 1GHDT13S72
Thanks for all your replies.I changed the decoder motor(complete from GM),changed the blue GM fluid,vehicle works fine.
2005 Pontiac Vibe 1.8L No Start, Stall, MIL Lamp on VIN: 5Y2SL638X5
Thanks to you that replied. The repair was a new PCM. Most of you suggested that and that's what I concluded after my testing with the no communication to my scanner. However, one of you (Mark) reminded me that it is covered under the 8 yr / 80,000 mi wa...
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