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Prev Professional Automotive Repair Technical Discussions for October 8, 2020
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Open Help Requests for GM
Help Request Answers
1997 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions VIN: 1GCHC39J4V
Fail smog check on high nox emission reading.. Emission reading for hc is 46 ppm, o2 is 1 percent, co is 0 percent, and nox is 1009 ppm. Egr system is functional. Engine temperature is normal.
2009 Chevrolet Silverado 2500 HD LT 6.6L loss of communication codes VIN: 1GCHK53649
customer complains that when making right turn while towing the stability light blinks then stays on codes present u0137 p0575 u0100 u0101 u0140 u0121 i am a one man shop and i know ill have to do some wiring diag most likely but i...
2009 Chevrolet Malibu LT 3.6L No Crank VIN: 1G1ZJ57709
I have this 09 Malibu with the 3.6L engine and MH2 transmission. It has an intermittent no crank. DTC's present: ECM: P0700 TCM: P2535- ign switch on/start position circuit high, U0121- lost comm w/EBCM, U0140- lost comm w/BCM EBCM: U2106- lost com... Trouble codes: P2535 (ign switch on/start position circuit high), U0121, U0140
2017 Chevrolet Express 2500 LT 4.8L Air Bag VIN: 1GAZGNFF4H
Greetings all. I can not find very good information about this code, other than a TSB in identifix talking about internal module error, replace module. I haven't been able to duplicate the light or code under various conditions during various test drives...
1999 GMC K1500 Suburban SLE 5.7L Replaced fuel pump VIN: 1GKFK16R3X
Vehicle came in leaking gas. Inspection found a large rust hole at rear seam of tank. Due to the age and millage we recommended replacing the tank - no brainer. We also scrapped the pump and vents along with the tank. Just didn't want to risk having to dro...
2003 GMC Sierra 1500 HD SLE 6.0L Mechanical VIN: 1GTGK13U03
need a little help!!! i have misfire on #5 and #6 checked for spark has good spark. tried switching coil,plugs,wires and injectors with no change. both misfires are both same. checked compression it was at 150 psi. checked for busted valve spring both were...

Fixes & Summaries for GM
Fix/Summary Answers
2008 Chevrolet Trailblazer LT 4.2L Abs module VIN: 1GNDT13S08
Thanks to everyone that took the time to respond it was a speed sensor problem had to take the shim off front wheel brg it was an aftermarket brg
2004 Pontiac Grand Prix GTP 3.8L reduced power VIN: 2G2WR52454
Would like to thank all for the time spent. I had tried two app sensors as OEM was only available back East. So I ordered one from back East and waited installed and as always Burned by aftermarket parts!!! Not one but both of them where NFG. Thanks Trouble codes: P1125 (tp/app sensor circuit problem), P2125 (App sensor 2 circuit), P2138 (App sensor 1-2 correlation).
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