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Prev Professional Automotive Repair Technical Discussions for February 19, 2015
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Open Help Requests for GM
Help Request Answers
1999 Chevrolet S10 4.3L Charging
we have one here that we can not get to stays 12v and drops of. alternator is charging 12v and 15 amps and also drops of. we connected the field wire to battery no change (we can hear the alternator charge but won't put out higher voltage).we disconn...
2000 Chevrolet C2500 5.7L No Start VIN: 1GCGC29R5Y
This truck was driving on the freeway and died at 70 mph when coasting to side he said it sounded like sand or gravel (I'm thinking trans noise)? Towed into shop and has all symptoms needed to fire but doesn't even pop. Has spark not the brightest, fuel pressu...
2008 Chevrolet Avalanche LS 5.3L transfer case shift module VIN: 3GNFK12328
Checked fuses, power feeds, grounds.Found similar problems on identifix calling for bcm reflash. Took it to local dealer to program bcm,I was told there were no updates, however he could not communicate with transfer case or airbag module, [i have no issues co...
2008 GMC Yukon Hybrid 6.0L liftgate and courtesy lamps VIN: 1GKFK135X8
Hello all. This 2008 yukon Hybrid came to us because the courtesy lamps will not turn off. They only turn off after the vehicle sits for about 15 minutes with the key off. (Power save kicks in). Also the liftgate, which is not power, will not open. The unlock ...
1997 Pontiac Grand Am SE 2.4L ecm VIN: 1G2NE52T3V
car came into shop with no start condition, would not crank. The key switch would not turn far enough to engage start position. It would start with key in the on position and jump starter relay. I replaced the ignition switch and now it cranks ok, will start a...
2003 Pontiac Sunfire SE 2.2L Poor Idle Quality, Poor Fuel Economy VIN: 3G2JB52F83
OK wife's car. I have checked timing chains OK plugs are dark colored 0/2 sensor black. Tried different injectors ,coil pack ,ign module. Plug evap. Coolant temp and air temp ok

Fixes & Summaries for GM
Fix/Summary Answers
2000 Cadillac DeVille DHS 4.6L No Start VIN: 1G6KE54Y9Y
Looks like the vehicle was stuck in between module communications due to a low batt. I did check the ground cable from the chassis to the alt bracket, all was good. Recharged the battery and everything started working again, I did disconnect and touched batt c... Trouble codes: U1301.
2008 Cadillac DTS 4.6L MIL Lamp on VIN: 1G6KD57Y68
Pulled EGR to check for insufficient sealing and valve was sealing fine with no carbon buildup. My calculated engine load was 41.2% on freeze frame. I then pulled the air filter and each seam was stuffed with debris and bugs. Put new air filter in vehicle le... Trouble codes: P1400 (Cold start emission reduction control system).
2002 GMC Sierra 2500 SL 6.0L shifting VIN: 1GTHK29U12
looks like craig and hal get the must be the wrong case for the vehicle.has np1 build code that equates to a np263 transfer case-ordered a used one .I'll let you know how it goes thanks
2006 GMC Sierra 2500 HD SLE 6.0L 3rd Gear VIN: 1GTHK24U96
Pressure control solenoid! thanks to everyone who replied especially Mel and Robert. Pressure test which I should have done immediately showed low pressure and not changing when activated with scan tool. New pressure control valve fixed pressure and shifting...
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