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Prev Professional Automotive Repair Technical Discussions for February 27, 2015
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Open Help Requests for GM
Help Request Answers
2003 Cadillac CTS 3.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G6DM57N53
Hello Caddie tech's, we replaced the intake manifold gaskets for a missfire on bank one, 1,3 and 5. That fixed the miss, but this car was started without the throttle body hooked up. So now we are having a problem with getting this to relearn. Did the procedur... Trouble codes: P2176 (Min t/p not learned)
2008 Cadillac CTS 3.6L No power VIN: 1G6DV57VX8
Hey guys. I got this 2008 CTS with 3.6 L "V". Costumer had it towed in with "Reduced power" message on display screen and trouble codes P0087 & P0089. With the little information and knowledge I have on this fuel system I tested fuel rail pressure sensor signa... Trouble codes: P0087 (Fuel rail pressure FRP too low), P0089 (Fuel pressure regulator performance)
1995 Chevrolet Camaro 3.4L No Start, no inj. pulse VIN: 2G1FP32S4S
OK guys I need some help here, this one has eatem my lunch and come back for dinner. This vehicle came in for stalling and not restarting after a short trip. When it originally came in it started and ran, not well, but enough to get it into the bay. It was thr... Trouble codes: 82 (3X signal malfunction)
2004 Chevrolet Cavalier 2.2L Stall VIN: 1G1JC12F94
This car shuts off while driving. It runs fine when running. When it shuts off, it will restart if you turn the key off and back on. I have even had it die (quit pulling) at 50 MPH and cycled the key off-on and it will pick right back up without ever coming to... Trouble codes: P0141 (B1S2 O2 sensor heater)
2004 Chevrolet Tahoe LS 5.3L ipc/alternator VIN: 1GNEK13Z04
Truck was towed in stalled while driving. connected charging/tested,charged battery, performed system test,all passed except battery.alt output 14.3 volts idle no load. under load conditions 13.8 volts. replaced battery performed system test, no alternator out...
2005 Chevrolet Express 1500 LS 4.3L tcc VIN: 1GCFG15X45
Complaint of poor acceleration. First road test confirmed the complaint. Second road test showed no issues. Owner is cheap (like most) and wanted to just service the trans and hope for the best. Van is back with same complaint and codes. I have a TCC solenoid ...
2010 Chevrolet Impala LT 3.5L ignition cylinder VIN: 2G1WB5EK9A
Vehicle came in with complaint that the key wouldn't turn off.Tech found that if theft module was disconnected,key turns off.Cannot find a diagram for module on alldata or Mitchell.Can anyone point us in the right direction?
2001 GMC Yukon XL 1500 Denali 6.0L MIL Lamp on VIN: 1GKFK66U61
most of the time fault sets on cold start up but have gotten it to fail on decel at highway speed inspected wiring from tps to tac module. Issue occured after lower intake gasket repair Trouble codes: P1221, P1220, P1515
2003 GMC Sierra 3500 SLE 6.0L No Start VIN: 1GDJC34U53
Cranks but no start condition. Turns over, sounds like it's firing then dies every time. This truck was towed in from another shop. They got as a no start with a P0336 code (intermittent crank signal-bad signal for at least two seconds). They put in a crank s...
2002 Saturn Vue 3.0L engine VIN: 5GZCZ63B72
Hello techs! I have a big problem and I hope to eliminate this problem with your advice. A week ago a customer brought to me 2002 3.0l Saturn Vue with hard start complaint. With my Modis scanner I saw that the MAF, IAT, ECT, CMP sensors had fault codes. After ...

Fixes & Summaries for GM
Fix/Summary Answers
2007 Cadillac Escalade 6.2L Poor Idle Quality, MIL Lamp on VIN: 1GYFK63807
Thanks for all of your help on this one the customer decided not to make repairs Thanks again Tom Trouble codes: P0420.
2001 Chevrolet Impala 3.4L Extended crank after hot soak VIN: 2G1WF55E51
The problem was the fuel pressure regulator. When I first was testing the fuel pressure and regulator I didn't see any fuel leaking out of the vacuum port. I guess I didn't wait / run it long enough but nonetheless today it was certainly showing signs of leaka...
2005 Chevrolet Trailblazer LS 4.2L Canister Vent Solenoid/PCM VIN: 1GNDT13S35
Well, I'm glad I took the time to post on here and wait to see if I received any useful replies. I went back over my tests again and finally did confirm that the White wire at Pin 17 at the PCM had been compromised somewhere between the PCM and the vent valve....
2006 Chevrolet Impala LTZ 3.9L MIL Lamp on
Thanks for all who replied with car has been fixed! I found that the lower intake gaskets were leaking internally after I smoke tested the vehicle again after letting it sit outside overnight in -15 degree whether ( got to love Iowa) . Intake gasket set has be... Trouble codes: P0171, C0561.
2006 Chevrolet Trailblazer LT 4.2L charge light VIN: 1GNDS13S56
Thanks for your help. Most of you were right. The problem was in the cluster. Replaced it and all is well.
1992 GMC Typhoon 4.3L Poor Idle Quality VIN: 1GDCT18Z8N
Thanks for all that had any input, map sensor was all over the place on the readings.i replaced and although it didn't idle perfect, it did make a great difference.
2002 Pontiac Firebird Formula 5.7L MIL Lamp on VIN: 2G2FV22GS2
found short in wire harness to ftp sensor on return ref. replaced wire to ecm Trouble codes: P0446.
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