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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 11, 2010
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Open Help Requests for GM
Help Request Answers
2000 Buick LeSabre Custom 3.8L Door Locks VIN: 1G4HP54KXY
This vehicle's door locks are not functioning electrically. They do not work with either door lock switch or either key fobs. We scanned the drivers door module and found that there was a code #U1255 Class II Data Malfunction.We checked the inputs via scan dat...
2001 Buick Regal LS 3.8L Stall VIN: 2G4WB55K31
I have a 01 Buick 3.8L, customer complains of stalling. After scanning, finding no codes, fuel pressure is within spec. It took several test drives to get the car to stall. It acts like it runs out of fuel, with no drop in fuel pressure though. After stall the...
2000 Cadillac Seville STS 4.6L Blower, Fan Speed control VIN: 1GK6KY5493
Caddies are a blast. This came in with fan not running. It was dead when we worked it. It was fairly straight forward. Found voltage at the Fan Mod, made the fan spin with 12 V. Scoped the Control wire coming from the head, got a pretty WF. It moves nicely on ...
2003 Cadillac CTS 3.2L MIL Lamp on, limp mode VIN: 1G6DM57N83
This one happens only once a month but when it does it will only idle until he restarts the car then it just shifts bad until i clear the codes. I have never been able to get the car to act up. But when i was checking it out i once had 28ohms on the low ref.at... Trouble codes: P0221 (Tp s 12 mismatch), P2176 (Min tp not detected), P2135 (Tps 1 2 voltaged more than predicted)
1986 Chevrolet Corvette 5.7L clutch VIN: 1G1YY0789G
ive replaced everything in the clutch system and bled the entire system as a unit off and on the vehicle. still i have a low pedal. ive checked all measurements and specs. all are in spec. i thought that i may have had a bad m/c so i replaced it again. still n...
1995 Chevrolet C1500 5.7L 3-4 shift VIN: 1GTEK14R4T
I am working on an older car with a 95 5.7 throttle body and 4L60E suppsidly out of a 95 two wheel drive suburban. Runs fine and shifts like it is supposed to until you put it in overdrive, it stays in second gear. All other gears work like they are supposed t...
1996 Chevrolet C2500 Suburban 7.4L Hesitation, Surge, Misfire VIN: 1GNGK26J9T
Scan tool data looks ok. Intermittently at a stop it will misfire & or unstable idle. At cruse most of the time it feels like the cruse is hunting, surgeing, & or momantary buck. At medium to hard accel it is ok, at floored it is ok. Even though the scan tool ...
1998 Chevrolet Monte Carlo Z34 3.8L MIL Lamp on VIN: 2G1WX12K4W
I received the car not running. It had an intermittent no start. I believe the fuel pump was replaced, then the lock cylinder. After which the turn signals were inop. next the steering column was replaced to try to remedy this. Then the car would not start at ... Trouble codes: P0452 (fuel tank pres sensor open/shorted)
2001 Chevrolet Silverado 2500 HD LS 6.6L MIL Lamp on VIN: 1GCHK23171
Check engine light is on, and has a po380 code. Was that way all thru the winter and never had a starting problem. Check voltage at the large red wire at controller, good. Checked voltage at other two large terminals one powers up with key on, and also powers ... Trouble codes: P0380
2002 Chevrolet Suburban 1500 LT 5.3L parking brake VIN: 1GNFG16Z52
truck has no adjuster nuts on main cable and alda quotes have to pump e-brake pedal 3 times and its is adjusted. I tried this and it has a lot of free play in the cable, the pedal goes to the floor and truck won't hold. alda has a procedure to install a screw ...
2004 Chevrolet SSR 5.3L Door Locks,Windows, Roof Top, And Lower Gauges VIN: 1GCES14P74
I have a 2004 ssr 5.3. Customer came in with complaint of door locks,roof top,and windows dont work. Checked with tech2 and found that no responce with roof top module. Replaced roof top module and roof started working but noticed that the radio was making a p...
2004 Chevrolet Silverado 2500 6.0L No Start, Stall, MIL Lamp on VIN: 1GCHK24U14
Vehicle died on road. Customer pulled in to us. It started for me and i drove it in shop. Vehicle then died. I have good fuel pressure. Found these codes. Scoped crank sensor and found it starts acting weird and then goes flat, vehicle dies. It will not start ... Trouble codes: P0332 (Knock sensor 2 signal short/low), P0335 (Crank sensor a circuit problem), P0336 (Crank sensor a 18/24x out of range), P0455 (Evap large leak)
2005 Chevrolet Impala 3.8L Cuts out VIN: 2G1WF52K35
Car cuts out only on acceleration cold. Idles good. After operating temp it starts running fine Trouble codes: P0350, P1350
2002 GMC Sierra 2500 HD 6.0L Misfire, MIL Lamp on VIN: 1G23687916
Vehicle only missed at highway speeds under a load. Misses between 65 and 75 MPH. Cylinder 1 and 6 are the only cylinders missing. Runs great without misses at lower and higher speeds. Trouble codes: P0300 (Random Cylinder Misfire)
2004 GMC Sierra 3500 6.6L Differential VIN: 1GDJC34264
when making hard turns there is popping or binding coming from rear diff. This is not a 4 wheel drive and it is dual wheels in back any help would be great..
2006 Pontiac Montana SV6 3.5L All Wheel Drive System VIN: 1GMDX33L46
All wheel drive disabled message on always, checked harness to rear axle, passes flow chart for code from gm, has had axle solenoid valve in rear end replaced. When looking at transmission data for awd it shows awd whl spd disable as yes and abs disable as yes...
2002 Saturn LW300 3.0L Tcc VIN: 1G8JW84RX2
2002 Saturn LW300 with 28,000 miles. Reported to be a flood vehicle, though I can see no evidence of damage. Fluid level verified. Transmission shifts fine through all gears, but TCC kicks in and out. You can watch the slip go positive and negative when this o...
2003 Saturn Vue 2.2L unwanted ABS engagement VIN: 5GZCZ33D93
Hey Saturn techs, I have a troublesome unwanted ABS activation while driving at around 35 mph.Car was towed in with a RR wheel locked up. If you hit a bump in the road while driving, ABS will engage if your just accelerating. It is to the point where it will...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Chevrolet K1500 Silverado 5.7L brakes VIN: 2GCEK19K0P
Thanks to all who replied. Truck is considered fixed and turned loose to owner. I could not find any problem with the rear ABS hydraulic control valve (thanks to Ranjit for the neat paper clip dipstick trick). Rear ABS is working as designed. Thought all along...
1996 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP22P1T
Ok. We finally have this beast fixed. It ended up being the customer installed distributor base was defective. We got a new unit and installed it and al is well. Been 2 weeks and 500 miles with no problems. Thank you all for your help in getting to the bottom ...
1997 Chevrolet Express 3500 6.5L No Start VIN: 1GCHG35F4V
well folks it is fixed. i tried unplugging the optic sensor and it still would not start, i unpluged after market module, resisitor was still in the module in the correct spot. I plugged into original module and still no start. Then i tried plugging the new mo...
2000 Chevrolet C3500 7.4L fuel gauge VIN: 1GBKC34J3Y
repaired wire at dash cluster plug it had 1 strand left thanks for all of your help iatn members frank [...]
2003 Chevrolet Impala 3.4L starter VIN: 2G1WF52E43
Thanks for all the comments, with your help I was able to diagnosis a problem BCM, sent it to dealer for program and install. wanted to wait and see if the fix was made with BCM before posting this fix.It did have the early BCM per number that you all brought ...
2004 GMC Savana 3500 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GDHG31U04
Thanks to all that took the time to respond. Well I wish it was more of a interesting repair than this but it ended up being a bent intake valve in #2 cyl. Sounds amateurish to say I started a help request over a bent valve diagnostic but bare with me. Consid... Trouble codes: P0300 (Cly missfire).
2000 Pontiac Grand Prix GT 3.8L engine/trans VIN: 1G2WP52K81
I am truly grateful to all who replied! since I was shooting from the hip, (which I am absolutely opposed to, but since it was a request from a real good "kid", and knew no first hand knowledge of this particular vehicle,and didn't want to see him get stuck wi...
2002 Saturn L100 2.2L Key VIN: 1G8JS54F52
All is well. I replace the ignition tumbler and it seems to work fine now. Rather odd, a whole bunch of posts for the key not turning and none for it turning all of the time.
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