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Prev Professional Automotive Repair Technical Discussions for January 20, 2015
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52KXW
Customer was told that he need 2 02 sensors 1 code for heater circut other for not enough switching Same issues will not go in to closed loop always shows lean on scanner with no crosscounts sensors stay at a short range of switching 241 on one 432 on other. c...
2007 Cadillac DTS 4.6L MIL Lamp on VIN: 1G6KD57Y17
Customer came in with mil light on, pulled code p0411 air injection incorrect flow. Test pump for activation, none. Removed hose between pump and solenoid, full of water. Replaced both pump and solenoid due to water intrusion. Clear code and returned vehicle t... Trouble codes: P0411
2008 Cadillac Escalade 6.2L Mechanical VIN: 1GYFK63828
This truck came in with #1 cylinder misfire. We checked normal ignition & fuel, then checked compression. Had very low (10-30 psi) cyl #1. Pulled valve cover & found intake rocker not moving. Looks like lifter blew apart. Removed cylinder head to inspect lifte...
1996 Chevrolet C3500 Cheyenne 7.4L No Start VIN: 1GCHC33J6T
Hi all, Truck came in no start with a P0340 code. Customer said truck died on the freeway and wouldn't start. Pulled distributor cap (great location too ugh) and saw that rotor had came loose. One of the screws that hold the rotor down had somehow broke off in... Trouble codes: P0340 (Cam position sensor)
2004 Chevrolet Silverado 3500 6.6L No Start VIN: 1GBJC39224
I have 2 concerns with this truck. First one is the driver accidently filled the fuel tank with off road fuel. I know this fuel has higher sulpher content. Will this harm the truck in any way or is it safe to run the fuel out and refill with on road fuel? The...
2004 Chevrolet Impala LS 3.8L Heater Inop VIN: 2G1WH52K04
This car came into the shop cause the blower just stopped working had one of the techs drop cust off and started working again i did some digging and found that the ignition switch were common for this problem so i put one in and then started up and still no b...
2009 GMC Acadia SLT 3.6L Electronic VIN: 1GKER23DX9
Vehicle back with same exact issue
2003 Pontiac Grand Am SE 3.4L Security Light VIN: 1G2NF52E13
Hello thanks in advance to those who have any thoughts on this!my customer went on vacation for a week,and when she got home and tried to use her grand am,she said that when she went to start the car and headlights,dash lights,overhead light all st...
2008 Saturn Astra XE 1.8L variable intake VIN: W08AR67158
Hello again, 2008 SATURN ASTRA 1.8 came with the code P065E - variable intake signal. No driveability issues, flap, bellows moving freely, we can reset it but code pending returns in minutes. We are not experienced with GM products, no suitable scanner for 2 -...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Regal Custom 3.8L Locks, Dome Light VIN: 2G4WB52K0T
Thanks for all the help! It turns out that you were all on the right track. The car is not a flood vehicle, but the body control module had been wet in the past, and had corroded the ground in the main wire connector inside the housing. Replaced the BCM and sp...
2006 Buick Lucerne CX 3.8L No Start, no crank VIN: 1G4HP57206
Thanks for the replies, I checked each suggestion to no avail. I contacted Identifix about the specific circuits in SP300, Alldata only indicated that each of the 3 lines were connected to the GMLAN not which components specifically. The line that fed to the i... Trouble codes: P1629 (Theft Deterrent Fuel Enable Signal Not Received), P1819 (DTC P1819 Internal Mode Switch - No Start/Wrong Range).
2008 Chevrolet Impala LS 3.5L speedo jumps VIN: 2G1WB58K78
I got an answer from GM tech - BCM is hub for all Communication - they said to clean & lube all plugs @ BCM & cut off zipties cinching wires together at plugs - car has been good for7 days so far - no SES light - no speedo jump!
2004 GMC Envoy SLT 4.2L Engine VIN: 1GKES16S54
Well, sorry it took me so long to respond to this. I removed the intake camshaft and found that the head shop had broken off one of the cap bolts. Their fix was to punch the broken stud in farther, heli-coil and use the same broken bolt. I had about 3 threa...
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