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Professional Automotive Repair Technical Discussions for June 7, 2018 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 2001 Chevrolet Silverado 1500 5.3L smog test "not ready VIN: 1GCEK19T61 Pickup not passing smog test, due to incomplete secondary air monitor. Multiple drive cycles run from cold start; all other monitors completed. Coolant temp normal, ECT, IAT matching +/-2 degrees on cold starts. Oxygen sensors at ~150mV on cold starts, with ai... |
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| 2004 Chevrolet Trailblazer LS 4.2L No Start VIN: 1GNDS13S94 Hello to all. We have this trailblazer that has no communication with any module. I have tried them all. I have checked all fuses, ignition switch output, measured 7 volts on bus wire at dlc, tried different scanner, checked grounds to no avail. The cluste... |
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| 1995 GMC K1500 Sierra SLE 5.7L Poor Idle Quality VIN: 2GETK19K6S Got this 1995 Sierra with a 5.7 litre that had heads removed and valve job done. It runs just a touch rich at idle. Enough to cause a little fishbite feel. Just barely noticeable. All spark plugs just a touch dark showing rich mixture. Runs fine otherwise,... |
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| 2007 GMC Yukon XL 1500 Denali 6.2L automatic level control VIN: 1GKFK66817 I can not get the ESC module to run the compressor,even when commanded by the tech 2. Jumping the blue wire #9 at the ESC will turn on the relay and compressor runs. A second used ESC module with Same results and no codes. |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2004 Cadillac CTS 3.6L No Start VIN: 1G6DM57714 As the old saying goes dont judge a book by its cover. The car wasnt as bad as I thought. The three hack jobs I saw the first half/hour I was there were the only three done to car. And actual his hot wire to the starter helped me out. My boss didnt want the jo... |
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| 2007 Chevrolet Colorado LT 3.7L Cooling Systems VIN: 1GCDT13E47 Doug [...] nailed this one - the fix was to replace the faulty coolant temp sensor! This vehicle only uses one sensor for the PCM input and for the temp gauge. It was skewed 15°F after an over night sit vs ambient air and inlet air temps. Never would have guessed ... |
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| 2016 Chevrolet Malibu LT 1.5L Electrical VIN: 1G1ZE5ST2G I was able to attain a wiring diagram for this and check each wire on the 5V2. Each wire had a good ground and a good 5V signal. At this point I pulled up the signals on my scanner. Strangely the oil pressure would go from being around 30psi (normal) to 137... |
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| 2000 Oldsmobile Intrigue GL 3.5L MIL Lamp on VIN: 1G3WS52H2Y I removed the throttle body and found that the EGR passage is 100% clear. I did notice the MAP signal did not rise briefly during deceleration meaning the ECM did not perform a self test. I'm going to replace ECM and retest Trouble codes: P0401 (EGR insufficient flow). |
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