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Prev Professional Automotive Repair Technical Discussions for August 16, 2010
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Open Help Requests for GM
Help Request Answers
1992 Buick Riviera Luxury 3.8L MIL Lamp on VIN: 1G4EZ13L9N
Hard code set as soon as it is started. I replaced cam sensor with OEM Delco sensor with no change. Voltage on sensor harness terminal A-B is 6.5 volts & B-C is 10.8 volts. Voltage on BA12 at PCM KOEO is 4.8 volts. Start engine and voltage at BA12 is 4.8 volts... Trouble codes: 41 (Cam Sensor Circuit)
1995 Cadillac Seville STS 4.6L abs VIN: 1G6KY5290S
This vehicle cam in with customer complaining of the abs light on w/ traction disabled message on instrument cluster. I went through the trouble chart and condemed the abs unit. Customer had anpther vehicle at home(wrecked) with functioning abs. We swaped unit...
1985 Chevrolet Camaro Z28 Iroc-Z 5.0L engine VIN: 7776565625
pulled the 305 out an replaced with a high performance 350. compression 10.2 to 1. brand new 195 thermostat, aluminum water pump. i am running a stock radiator. cannot seem to get this bad boy to stop overheating. when i am running on the highway the temp rise...
1994 Chevrolet K1500 5.7L Excessive Emissions, Hesitation, Cuts out, Poor Fuel Economy VIN: 2GCEK19K6R
Truck came in with listed parts replaced . Engine is real rich with black smoke and at times Gray smoke Frome tail pipe. Scanned and found no codes it will backfife from intake at times Under load. Checked Base timing and found at o With timing connecter unplu...
1998 Chevrolet K1500 Silverado 5.7L ABS System VIN: 2GCEK19R3W
Truck came in ABS pulsing stop every time the vehicle stops. Verified pedal and found slow bleed down so replaced the master cylinder. Bled system and then tried to auto bleed the ABS system but will not run test with Verus. Noticed that brake switch was not a...
2003 Chevrolet Silverado 1500 4.3L Gauges VIN: 1GCEC14X43
Instrument cluster is rapidly failing, especially fuel and temp gauges, and now the speedometer. I want to replace the cluster, but I need some advice on the best route to follow.(At 140K miles, I'm assuming no warranty?) If I get a unit from GM, will it need ...
2004 Chevrolet Colorado 3.5L No Start VIN: 1GCDT136X4
Hello everyone and thanks in advance for taking the time to help me. This is my brothers truck so i have been driving it to witness exactly what this truck does. It has been narrowed down to the ignition switch itself. The problem is both new GM switches i hav...
2006 Chevrolet Impala LS 3.5L cruise control VIN: 2G1WB58K96
i ran a procedure /test from identifix on this cruise. the little light on the cruise button which is on steering column doesnt light and cruise inop. theres no codes anywhere stored in vehicle computers although customer insisted light came on while driving. ...
2007 Chevrolet Silverado 1500 LS 4.8L MIL Lamp on, harsh shift VIN: 1GCEK14X47
This truck came in for the trans shifting very harsh. Test drove and verified. Check engine light on and abs light on. Also noticed speedometer jumps all over when moving. Scanned for codes and have no communication with pcm, trans module, abs. Got p0700 from ...
2005 GMC Sierra 3500 SLT 6.6L Abs VIN: 1GTHK33265
Truck came in at 131,000 needing a r/f hub and bearing due to an ABS speed sensor code. At 133,000 truck came back for intermittent ABS light yet never had any trouble cdoes. At that point after following alldata diagnostics we replaced and reprogramed the ABS...
2005 GMC Envoy XUV SLT 4.2L rear door/window VIN: 5616065300
rear window won't go up or down.i've confirmed that the window regullater has hand geranded,but i can't figure out how to open the rear door.i don't see a handle or latch anywhere.any help would be apreesheated...thanks scott
2007 GMC Yukon Denali 6.2L no crank VIN: 1GKFK66887
Hello group this came in as a no start well does not crank, The service antitheft, traction control, and stabilitrack system are being displayed in the cluster, I have no communication with any module tried tech2 and snap on scantools nothing, pin6 at aldl rea...
2008 GMC Envoy Denali 5.3L Hacv/Temp Gauge VIN: IGKET63M78
Truck came in with the temp gauge 100 degrees( lowest reading on gauge) no a/c compressor operation gauge warning light on. After a restart compressor came back on and gauge was normal. Customer states problem comes and go many times a day. I could not recreat...
1997 Oldsmobile LSS 3.8L Misfire VIN: 1G3HY52K0V
This vehicle came in the shop for Smog failure on nox at 15 and 25 mph, and code p0300 random misfire. I checked the EGR valve for nox found it was working fine , the O2 sensor is in fuel control, compression, is at 180 psi all 6 cylinder, We changed the Cat t... Trouble codes: P0300
2003 Oldsmobile Alero GLS 3.4L all light in the front dont work VIN: 1G3NF52E93
Tried to check out to see why no lights in the front of the car but all lights work inside and in the rear of the vehicle. radio and engine and everything else is fine. I have tried to test The BCM and mult. function swtch but not coming up with anything. Plea...
1990 Pontiac Grand Prix LE 3.1L No Start, Poor Idle Quality, Stall
Car came in on tow truck, Checked fuel pressure, spark and injector signal. Was weak spark so i changed plugs, module with cranksensor. Car ran like a dream. Next day when customer came to get it i wouldnt start. Cranks well and feels like it wants to start. C...
1997 Pontiac Trans Sport 3.4L Overheat VIN: GM12345678
Looks like upper heater hose has a brake and leaks at the fire wall. Customer ran van all day before noticing it was running hot and very rough. Other shop said that the engine was damaged, head cracked, gasket bad and making bad sounds. No test data are avail...
2001 Pontiac Montana 3.4L No Start, No Crank VIN: 1GMDX03E91
Customer had vehicle towed in for a no start complaint. The problem in fact is a no start, no crank. Went through the complete starting circuit and determined everything was ok, except the pcm is not sending ground signal to the starter relay. Decided to repla...
2005 Pontiac Grand Prix GT 3.8L heater core VIN: 2G2WP52255
Hello all GM Techs, Vehicle dropped off with coolant leaking on pass feet complaint. I have looked at repair procedure on Mitchell. Mitchell states to remove front carpet to facilitate rear floor outlet duct removal. Also I notice that there are what mitchell ...
2006 Pontiac G6 2.4L MIL Lamp on, VIN: 1G2ZF55B76
We have this g6 and every month or so it stats up and sets all these codes, cleaned grounds and reprogrammed body control module, did ok for two months and then set the codes again. Seems to idle up and down on cold start and dash light flicker and gauges fluc... Trouble codes: B1000 (b1001-), B1001 (u0073-), U0073 (u2103-), U2103 (u2107-), U2107 (u2109-), U2109
2006 Pontiac Pursuit 2.2L Misfire VIN: 1G2AJ55F56
this car has new ignition module,dealer spark plugs and 2 new coil packs.misfire changes every time we start the car.all grounds were cleaned.Any help is appreciated.thanks jim Trouble codes: P0300
2003 Saturn Vue 3.0L rear VIN: 5GGZCZ53BO
I got a vue here that thumps from the rear when brakes are applied. I have replaced shoes twice and replaced drums and turned them once. It has no pulsation when I pull the e brake whilel driving. Its got a thumping noise that starts around 25 mph to 0. The no...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac DeVille 4.9L compressor VIN: 1G6CD53B4P
Thanks for the reply's. One of my Techs was working on this and filed the request. The problem turned out to be the connection at the low pressure switch, the female connectors were open to far to make good contact all the time.
1999 Chevrolet Express 2500 5.7L No Crank VIN: 1GAGG25RX1
thanks for all the help found wire on exhaust manifold just touching
2004 Chevrolet Tahoe LT 5.3L Vses, Abs,Ebcm VIN: 1GNEK13Z04
Thank you to all. Unfortunitly the customer needed the vehical back before we had a chance to get furthur into the problem. I put dielectric grease into the conectors at the steering angle sensor and lateral accelerometer, cleared memory out of all the modul...
2008 Chevrolet HHR LS Panel 2.2L convertor VIN: 3GCDA85D08
TCC pressure control valve in valve body was sticking scored valve & bore, due to the cost to repair we replaced trans with an assembly. thanks for your help.
1996 GMC Safari 4.3L blower motor VIN: 1GKDM19W9T
this ones fixed, it was the blower resistor.i was thinking that it could be the ignition switch or the resistor,just wanted to be sure before i replaced one or the other. again thanks to all who replied,as usual IATN is the best!!
2001 GMC Sonoma SL 2.2L No Start VIN: 1GTCS14531
upon performing a pin out test for powers and grounds,no grounds at pcm,traced circuits to s106 splice and found that connection corroded and open.repaired and retested ok.probably disturbed during the engine swap. thanks to all that helped.
2001 GMC Yukon SLE 5.3L belt VIN: 1GKEK13T61
Thanks for your help. Most of you confirmed what I thought it might be. It needs a compressor. I had a Suburban a yesr ago with the same problem but the cust just lived with it. Then the compressor blew apart one day and I replaced compressor and all that come...
2004 GMC Envoy SLT 4.2L Mechanical VIN: 1GKDT13S64
boy do i feel like a dope!i was told vehicle did'nt move when it made the noise.shop manage went out to truck and verified this.i think i had two problems from the start.encoder motor and sensor fixed that problem.when i felt motor it was vibtating real bad so...
1996 Oldsmobile Achieva SL 3.1L Starting VIN: 1G3NL52M7T
This car is now running but all the light in the cluster are always on the temp gauge is high and there is no rpm ,but the customer dont whant to speend a lot of money to buy a new cluster .the cluster that i buy is not good but the car is running ,the custome...
1998 Oldsmobile Achieva S 2.4L key and tumbler VIN: 1G1354ZNHH
Turning the key on for 10 minutes 3 times reset pass lock .I would like to thank all that helped,iant does it again!!!
2005 Pontiac Vibe 1.8L MIL Lamp on VIN: 5Y2SL63875
Thanks to all who helped me with my little nightmare. The method used to cure this puppy was to go to mitchell's wiring diagrams for a toyota matrix, which gives you 4 times the info that the gm side does. In the gm section, they only show tests on the positiv... Trouble codes: P2118 (Throttle actuator control motor performance).
1997 Saturn SL 1.9L gear ratio errors VIN: 1G8ZH5284V
Well I am closing this post. Got into it with the customer and haven't heard from him since. I purchased a used transmission from a 97 SOHC engine and will install it when I get caught up. Customer seems to think it is my responsibility for HIM buying the w...
2004 Saturn Vue 2.2L Clutch pedal VIN: 5GZCZ23D04
Thanks again it was the master cylinder. Put it on blead it out let it sit overnight and all was well in the morning.
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