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Professional Automotive Repair Technical Discussions for February 4, 2009 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1991 Buick LeSabre 3.8L Hesitation, Surge, MIL Lamp on, code 41 VIN: 1G4HP54CMH This is a hair puller.This car was previously diagnosed at another shop. Check engine light on always, code 41,cam sensor circut problem. Customer requested to verify diagnosis that cam sensor magnet was missing. Removed cam sensor and confirmed magnet was com... Trouble codes: 41 (cam signal circut problem) |
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| 1999 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52K5X Hello all this vehicle is a tow in from a friends shop. It cranks but will not start, soft pop back when you stop cranking. Wires look new, crank sensor looks new. All cylinders have spark, injector pulse is present. Fuel pressure 50psi, volume and quality loo... |
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| 2003 Buick Century Custom 3.1L Brake Pedal VIN: 2G4WS52J03 Hey Guys, Thanks in advance for your help. I have a problem that is getting tough to duplicate. I am working on a 2003 Buick Century 3.1L W/abs and my customer states every once and a while the brake pedal feels like it fades to the floor. I talked to him more... |
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| 1998 Chevrolet Cavalier 2.2L radio VIN: 1G1JC5245W the stereo has went into loc. Its a delco and I have the scrambled code of 452455. customer is coming soon and I was wondering if anyone knew what the code is to unlock it. It would be much appreciated |
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| 1998 Chevrolet Blazer 4.3L starts and dies VIN: 1GNDT13WXW Truck will crank and start for 5 sec and then die. Security light stays on and has code p1629 for passlock sensor circuit fault. Have tried clearing code, unhooking battery and even changing passlock sensor. But always the same result. I dont have much experin... |
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| 1999 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GNDM19W1X Nagging problem reoccures randomly. Works great each time a cap and rotor are replaced. Symptoms returned anywhere from 2 weeks to 6 months later after cap and rotor replacement. Heavy acceleration has no problem - takes off like a rocket. Light to moderate ac... Trouble codes: P0300 |
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| 2001 Chevrolet Blazer LS 4.3L Module VIN: 1GNCT18W71 Abs light comes on intermittantly , code C0265 is in memory. Grounds and powers check good with a headlamp as a load and a voltage drop test. All indications are a module. Any other known concerns to look for here before I replace the module? |
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| 2001 Chevrolet Impala LS 3.8L cooling fans VIN: 2G1WH55K51 Have an 01 Impala came in with temperature gauge reading at the very bottom, both cooling fans running continuously (KOEO or running), no fault codes stored in any systems. Scanner showed coolant temp at approx. 170 degrees after warm-up during testing, yet ga... |
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| 2003 Chevrolet Trailblazer LTZ 4.2L Surge VIN: 1GNDS13S33 The first thing we did is check the pcm for updates on software, there were no updates. The truck has the latest software in it. The problem is intermittent. When it was acting up the idle was surging and the map sensor was reading at 1.3v. When the vehicle ra... Trouble codes: P0105 |
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| 2003 Chevrolet Suburban 1500 LS 5.3L power seats VIN: 3GNFK16Z63 Vehicle has reverse drivers side power seat switch operation, dim PRNDL, outside temp. indicator is about 40 degrees off and ride control indicates needs service. Note: ride control compressor has been replaced, worked OK. Within a few weeks vehicle returned w... |
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| 2004 Chevrolet Silverado 1500 5.3L Surge, Misfire, MIL Lamp on VIN: 1GCEK19T64 we have engine misfire on 1357 cylinders plugs and wires good . Plugs will get a very heavy black carbon on them quikly compression is 125# across the board fuel pressure is good O2 sensor bank1 sensor is about 30 on the scan tool the rest run at between 550 a... Trouble codes: 300 (random cyl misfire) |
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| 2005 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1GCHK23U35 DTC U1007 Replace throttle body assy, TAC module, APP sensor checked all wiring did find purple wire at throttle body broken inside insulation repaired it, still same problem.As for data in the TAC module 0.0 V from APP 1 & APP 2 bypassed APP1 sensor (gas peda... Trouble codes: U0107 (loss of communication with throttle actuator) |
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| 2005 Chevrolet Silverado 1500 4.8L 2nd gear VIN: 1GCEC19V55 Hello, this truck shutters slightly when taking off from a stop. I can watch it electronically shift into second on the Tech 2, but there is nothing there (like shifting into neutral). If I get the speed high enough in 1st, it will go into 3rd. 3rd & 4th are f... |
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| 2005 Chevrolet Silverado 2500 HD 6.6L speedometer VIN: 1GCHK23285 Hello I have this silverado went through the trouble tree in alldata says to replace ipc I can move it with the scanner do not think this could be the cause i maybe wrong just wondering if anyone has ran into a similiar problem also the pcm coverts the signal ... |
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| 2001 GMC Yukon XL 2500 SLE 6.0L Misfire, MIL Lamp on VIN: 3GKGK26U81 Hi, fellow members, I want to tank you in advance for your help, this truck came for smog inspection to my shop, as soon as r.p.m. increased to 2500, service engine soon light came on, and d.t.c. p0300 sets in ecm, customer took it somewhere else for repairs, ... Trouble codes: P0300 |
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| 2004 Pontiac Grand Prix GT2 3.8L Hesitation, Surge, MIL Lamp on, Limp mode + trac con VIN: 2G2WS52294 We have been struggling with this problem for a while. vehicle starts and runs fine when first driven. issue appears to occur on the highway at speeds greater than 60mph and over 2000 rpm. what happens is: after exceeding 2000 rpm a loss of power is noticed (i... Trouble codes: P0068, P0101, P1106 |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1992 Buick Regal Gran Sport 3.8L Cuts out, Stall VIN: 2G4WF54LXN Thanks to everyone who replied to our request. Its fixed turned out to be pcm like many suspected. We tried tap testing but didnt find it but unbolting pcm from bracket and twisting caused symptoms to occur. Put in reman aftermarket pcm $128.00 customer is hap... Trouble codes: 41 (CAM SENSOR I dont think its related.). |
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| 2000 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y2Y thanks to all that replied, everyone said the same things. the fuel gauge issue was more then likly a sender problem and the P0125 was most likly a failed t-stat. I did replace the t-stat and that seems to have fixed that problem. however the customer declined... Trouble codes: P0125, P0463. |
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| 2000 Cadillac Eldorado ETC 4.6L rack shudder VIN: 1G6ET1292Y hey everyone sometimes in life you second guess and over think things,well this is one of those things.I knew deep down in my gut and heart that the reman rack was the problem because of the right turn shudder only.as for the fords they do this when front work... |
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| 1991 Chevrolet K1500 Cheyenne 5.7L 4x4 fuse VIN: 2GCDK14K8M Truck has been working fine for 3 days now. After truck dried off I pulled the connectors for both the actuator motor and the sensor(fuse did'nt blow), pulled actuator and tested(shorted),replaced actuator. Thanks everyone for the help, even though I was prett... |
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| 1993 Chevrolet Cavalier RS 2.2L Stall VIN: 1G1JC144XP After days of trying to duplicate problem with not much success, we replaced ignition module and crank sensor harness and have had no other problems |
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| 1998 Chevrolet Venture 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDX03E7W Well thanks to all that replied after reading though all the letters I went back and did a running compression on #1 cylinder and low and behold I started at 150 psi and as it warmed up it lost compression after like 2 min. I was down to 40 psi I then did leak... Trouble codes: P0300. |
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| 2001 Chevrolet Astro LS 4.3L awd transfer case VIN: 1GNEL19W81 AFTER TESTING ALL PARTS AND REPAIRING THE RED WIRE ON THE AB CIRCUIT. PLUS R&I TRANSFER CASE TO TAKE TO TRANS SHOP AND FOUND IT TO BE OUT OF ADJUSTMENT. INSTALLED T-CASE AND ALL WORKS GREAT NOW. |
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| 2002 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E12 Thanks to all that offered help. I looked at the TSB and cleaned and tightened all terms to the sensor but no good, When looking at these intermit no crank cars look at your data stream for a steady key voltage of aprox, 3.3 volts, This should not change ... |
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| 2002 Chevrolet Monte Carlo LS 3.4L low beams VIN: 2G1WW12E92 I HAD SIX REPLIES ON THIS ON! MOST OF WHAT WAS SUGGESTED I HAD ALREADY CHECKED OUT. AARON FROM OHIO SAID HE HAD SEEN THE MULTIFUNCTION SWITCH BAD ON ONE. WE CHECKED IT & REPLACED IT, & IT DID FIX THE PROBLEM. THANKS FOR ALL THE HELP. |
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| 2005 Chevrolet Impala 3.4L Starting VIN: 2G1WF52E25 hi guys i fix the car i must say thank you guys for your help . the car had a after market remote start there was a bypass module install that was the problem so i take it out program the vtd car starts. thank you guys again |
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| 1993 GMC Jimmy SLE 4.3L Cuts out VIN: 1GDCT18ZXP Found intake heat exchanger hoses routed backwards, causing no coolant circulation. This caused very high intake air temp. under load. After getting the coolant to circulate, and cool down the intake charge I still had slightly high boost pressure=18PSI. I had... Trouble codes: 31 (over boost / waste gate malfunction). |
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| 2000 GMC Sierra 1500 SL 5.3L no speedo/tach VIN: 1GTEC19T4Y thanks to everyone for thereexpert advise in this repair.after fixing the chewed up harness we have speedo/tach and transmission shifting correctly. |
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| 2001 GMC Jimmy SLE 4.3L electronic 4wheel drive VIN: 1GKDT13W51 THANK YOU TO ALL THE GENTLEMEN WHO RESPONDED! I FOUND A BAD ENCODER MOTOR/TRANSFERCASE MOTOR. WE HAD CHANGED IT TWO YEARS AGO WHICH WAS LEADING ME TO BELIEVE THAT IT WAS STILL GOOD. I ALSO FOUND THAT WHEN CLEARING SYSTEM YOU HAVE TO HOLD THE HI AND LOW BUTTONS... |
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| 1991 Oldsmobile 98 Regency Elite 3.8L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G3CW53L7M Thanks for all your help! Manual and others were right on .The napa Magnent was manufactured wrong ,the magnent polarity was incorrect and it would not trigger the hall switch. I installed a gm magnent that had a differant polarity and it now switches hall swi... Trouble codes: 41 (Cam sensor circuit). |
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| 1998 Pontiac Sunfire GT 2.4L Theft Deterrent VIN: 1G2JD12T2W Well I was not able to fix this one. Thank you to all who replied, as your information was helpful. Special thanks to Ron from Texas. Your post rang true to me, so I tried a crank sensor and was able to get the noid light to flash a couple times, but still no ... |
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