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Professional Automotive Repair Technical Discussions for October 6, 2016 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1998 Chevrolet C2500 Cheyenne 5.7L b2s1 o2 sensor VIN: 1GBGC24RXW customer states- vehicle runs rough at idle. check engine light on. codes- p0151 p0154 p0300 unplugged b2s1 and received .450mv bias voltage. replaced b2s1 02 sensor vehicle runs great, o2 sensors work properly. 2 days later, customer returns for same symptom... |
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| 2001 Chevrolet Impala 3.4L Steering Shake Upon Accelleration. VIN: 2G1WF55E11 Car feels like both lower control arms are completely worn or subframe bolts are loose when driving. Steering input is "wobbly" under a load, but smooths out on coast. The shake/wobble is comparative to braking with severely warped rotors, only this is under ... |
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| 2004 Chevrolet C4500 Kodiak C4C042 8.1L Fuel Lift pump operation VIN: 1GBE4C1E14 can not acquire proper wiring/ pinout for this truck engine combo. called a few very unhelpful dealers. scan tool is not able to see tank levels independently of each tank reading as far as i can tell and without proper wire and pinout i cant check signal wire... |
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| 2007 Chevrolet Silverado 1500 Classic LT 5.3L Excessive Emissions, Runs rich VIN: 2GCEK13Z97 Truck came to me with p0101 (maf sensor range) p0172 (too rich bank 1) p0175 (too rich bank 2). Replaced the maf sensor with new delfi unit. P0101 went away but system still way too rich. Swapped map with known good one, no change. Checked fuel pressure, good ... Trouble codes: P0172 (System too rich bank 1), P0175 (System too rich bank 2) |
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| 2007 Chevrolet Suburban 1500 LTZ 5.3L Radio VIN: 1GNFK16387 Came in with complaint of XM only cutting in and out and getting static. We replaced the antenna on a hunch and still no good. Suggestions? |
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| 2007 Chevrolet Express 1500 4.3L fuel gauge VIN: 1GCFG15X97 Fuel gauge on empty, P0463 in PCM, 4.9 volts at purple sender wire at tank (is that supposed to be 4.9v?),connected substitute sender and no change at gauge, scanner reads 0%fuel level... so no reading through purple wire to pcm but...voltage at purple wire so... |
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| 2003 GMC Sonoma SL 4.3L Transfer Case VIN: 1GTCT19X73 Hi, The FWD will not engage, either 4-hi or 4-low. Key on has all the selector buttons flashing once then the 2-hi light remains on. When KOER in neutral pressing either 4-hi or 4-low buttons and you can hear the transfer case shift momentarily, the correspond... |
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| 2014 GMC Terrain SLE 2.4L fuel gauge VIN: 2GKALREKXE Customer complaint is vehicle runs out of fuel at 1/4 tank. Dropped the tank and removed both fuel tank modules and checked resistance on both fuel level sensors. Both checked good. Reinstalled both modules and supplied ground and voltage to fuel pump. Primary... |
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| 2006 Pontiac Vibe 1.8L No Start VIN: 5Y2SL65886 After vehicle sits for a few days on first start up is an extended cranking no start. Found no Spark, injector pulse or Fuel pressure on initial crank for a few seconds then will start and have all three of those. I do have scan tool communication when conditi... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2010 Buick LaCrosse CXL 3.0L MIL Lamp on VIN: 1G4GC5EG4A Drove vehicle and no drivability problems or return of codes. Only documentation found was TSB #PI0549 having codes P0700 and/or U0100 set. This condition may be caused by an internal engine control module (ECM) anomaly. I Replaced ECM and had programmed to ... Trouble codes: P7000, U0730, U1000. |
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| 2007 Cadillac Escalade 6.2L starting circuit VIN: 1GYFK63867 Thanks to Robert and Michael after doing some testing, is was proved there was a short in the fuse box. Replaced fuse box the truck fired right up. |
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| 2006 Chevrolet Tahoe Z71 5.3L spongy brake pedal VIN: 1GNEK13Z86 turns out we got a bad new master cylinder, replaced master cylinder, gravity bleed for awhile brakes work good now |
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| 2008 Chevrolet Avalanche LS 5.3L Misfire VIN: 3GNEC12098 thanks to everyone who help out. al [...] hit it right on the head!!! they were 180 out, ill tell you I don't know how can my tech have put those lifter 180 out they have a guide!! new set of head gaskets and is ready. thanks guys |
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| 2008 Chevrolet Silverado 1500 WT 5.3L Engine VIN: 2GCEK19J18 Thank you all for the replies. We already were planning to run some engine flush through after service...And still will be. We did clean the heck out of that Cyl#4 valve, it was the only valve that looked remotely like that. We now know why... #4 exhaust lif... |
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| 2010 GMC Sierra 1500 WT 4.3L abs VIN: 1GTPCTEX6A Thanks for all the input.Had to send to a shop with a better scan tool .Ebcm was replaced at some earlier time with the wrong part.On this truck you could turn off traction control with switch in dash.Ebcm in truck did not have this feature.New part,lights out... |
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| 2003 Oldsmobile Alero GL 2.2L Stall VIN: 1G3NL52F93 Faulty pressure sensor ontop of NEW OE FUEL PUMP, forcing excessive fuel trims cutting off the injector pulse. Initial cause was in fact pass key issue but after reflash and key reprogramming after install of new pump is what lead me to start checking the pump... |
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| 2006 Pontiac Torrent 3.4L Instrument Cluster VIN: 2CKDL73F06 Richard from Michigan, Specmo was the answer. Just gave them the cluster part # and they fixed me up with bulbs. Thank you to all that replied. |
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