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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 7, 2010
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Open Help Requests for GM
Help Request Answers
1994 Buick Roadmaster Limited 5.7L MIL Lamp on, Shifts hard VIN: 1G4BT52P3R
Alright guys...sorry no test description. The reason is because I am inheritting this thing. Vehicle came in for hard shift...erratic codes...82 and 33. Owner orders a pcm has it programmed and I put it in. Now that I am working on it, this is what I can tell,... Trouble codes: 33 (MAP sensor signal voltage high), 82 (Shift solenoid A circuit)
1995 Buick Regal Custom 3.8L No Start, Stall VIN: 2G4WBS2L7S
Hi all I could really use some help on this one, car was towed in for a stall and no start condition, found and replaced a bad battery started fine and gave back to customer, they drove 10 miles and it stall with no start again towed back in and found no spark...
1994 Chevrolet S10 4.3L Misfire, MIL Lamp on VIN: 1GNCS13W6R
thus far can not establish communication to pull codes. tested aldl have ground and 5 volts signal. will not evan allow jumper for light to falsh codes. have good powers and grounds at pcm. have 5 volt rev. signal at tps and ect. can not pull data stream and/o...
1995 Chevrolet Blazer 4.3L Cuts out, Misfire VIN: 1GKCS13W4S
oldy but goody-have this blazer in my shop-every shop in town has looked at it-u drive it under load or power brake it it starts back firing and missing - u would think it's ignition related right away-i scoped it even while it was back firing -didn't see anyt... Trouble codes: 43 (esm module), 43 (esm module)
1997 Chevrolet Corvette 5.7L slave cylinder
Hello out their in iatn land. I need some advice on trans removal on a 97 corvette stick shift. I need to r + r a slave cylinder that leaking. To be honest im a little worried about this one, it looks nothing like any other trans i've done in the past. Alldata...
2000 Chevrolet Express 2500 5.0L No Start VIN: 1GCFG25M4Y
Have installed new fuel pump with wiring harness kit from dealer. Van returns every three months with blown 20 amp ecm b fuse. Found grey power wire for fuel pump shorted on extension housing of transmission. Have warrantied out fuel pump, repaired ground conn...
2002 Chevrolet Silverado 2500 HD 6.6L reverse VIN: 1GCHK29162
Chevrolet Allison transmission techs, Please help with the diagnosis of this 2002 Chevrolet pick-up with an Allison 5 speed automatic transmission. This vehicle came to me with a MIL on and code P0700 stored in PCM and P0743 stored in TCM. The customer says th...
2003 Chevrolet Silverado 3500 6.6L Water Pump Outlet VIN: 1GCJC33143
Hi Ladies And Gentleman. This is not my friends truck. I am not asking for anyone else either. Its all me. I have this diesel that is pouring coolant from a weep hole on some cooling system outfit that is beside the water pump. I think it is the thermostat hou...
2004 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13X94
vehcle came in with mil on code p0155. data stream showed all parameters ok. freeze frame show code set only at cold startup. assumed old sensor and replaced. mil comes back on and data points to high resistence at start up so codes sets for out of range condi... Trouble codes: P0155
2004 Chevrolet Silverado 1500 LS 5.3L Transfer case VIN: 1GCEK19T24
Recent overhaul for failed bearings. Came back with a loss of 4x4 function while on hills only. Test drove to duplicate & found that we have all 4 wheel drive functions while operating on flat ground (Hi, Lo, auto) and while on an incline until we let up on th...
2004 Chevrolet Aveo 1.6L Hesitation, Surge, Misfire, MIL Lamp on VIN: KL1TD62674
Call me a fool but i have read everything on Iatn about this condition and i had the intake and exhuast valves resurfaced! After many trips to a hole in the wall machine shop i decided to take it to another machine shop that told me the valves stem height was ... Trouble codes: P0300, P0700, P1781
2007 Chevrolet Uplander LT 3.9L t-stat VIN: 1GNDV23167
While idling, the heater will not blow heat. Once you touch the accelerator and rev the engine, heat will flow... upon releasing the accelerator, the air will cool after about 30 seconds, and after about a minute, it will blow continuous cold air until you hit...
2000 GMC Jimmy SLT 4.3L theft system VIN: 1GKDT13W6Y
This jimmy came in for a no start. security lamp flashin during crank. We ended up replacing the tumbler as it was very sloppy, and outer black portion was cracked and broken. Using modis the passkey voltage was flickering from 5v to 1.73v during crank before ...
2003 GMC Sierra 2500 HD 6.6L No Start VIN: 1GTHK23163
This vehicle was towed in, customer said it had been smoking and they had meant to get it in, it then died on them while going down the road and would not restart. We do not see a lot of diesel vehicles in here, so I am semi familiar with the Duramax, but not ... Trouble codes: P0341 (CMP sensor circuit out of range), P0380 (Glow Plug heater circuit problem), P0374 (Timing reference signal A no pulses), P0530 (Refrigerant pressure sensor circuit), P0622 (Generator field F control circuit problem), P0700 (Transmission control system fault)
2006 Hummer H3 3.5L Wheel sensor VIN: 5GTDN13616
Hi this is my daughters Hummer. She called to say that the ABS/Tracs light was on. It was on for two days then went out. The code I pulled was C0045 left rear wheel sensor. When the ABS/Tracs light was on she was not able to operate the 4wheel drive switch and...
1997 Pontiac Sunfire SE 2.2L Mechanical VIN: 1G2JB1246V
When this cust. bought this car the engine locked up so we replaced the engine after about three months the car started missing and I found the # 1 intake valve spring broken and the valve bent, I replaced the head with an AC Delco Head, the cust. drove 200 mi...
2004 Pontiac Grand Prix GT1 3.8L Door locks VIN: 2G2WP52274
Customer concern of door locks locking and unlocking on their own,sometimes trunk will open on it's own.Sometimes she can hear clicking in drivers door when this is happening.I have yet to varify her concern.Scanned codes.No codes,Commanded locks with scanner,...
1995 Saturn SC2 1.9L Stall VIN: 1G8ZJ5274S
Saturn only stalls cold, starts right back up every time, runs perfect at all other times. When cold, runs great above idle, let your foot off gas and it will stall. Sometimes it stalls right away, sometimes it's gradual. When the temp reaches around 130-140, ...
2003 Saturn Ion-2 2.2L power steering VIN: 1G8AF2F63Z
hello saturn guys, this saturn has the electric power assist steering and blows the fuse often but not immediately, i suspect the motor is the cause. i do not have a wire diagram of this model. if i replace with a used unit will the bcm have to be reprogrammed...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Seville STS 4.6L no start VIN: 1G6KY5494W
Thank you to all that replied to my staffs request for help. They forgot to mention that they replaced the battery with new o.e. and there was no injector pulse or RPM signal. As you suggested there was no crank signal. Both crank sensors were replaced and the...
1998 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y8W
Hey guys thanks for all the help. I finally fixed the deville.I found the vin off the car that the ipc came off of,I then cut a key with the new chip. I relearned the pcm several times and no luck but after releaning the pcm with a 10 min. relearn,and then doi... Trouble codes: P1631.
1995 Chevrolet G30 Sportvan 5.7L Drum brakes VIN: 1GAFG35K8S
We reversed the shoes from left to right, spent a little more time smoothing the backing plate grooves, adjusted both sides a little looser than usual and the problem is gone! Several replies directed us to check for differences in the wheel cylinders or poss...
1996 Chevrolet Cavalier Z24 2.4L Hesitation VIN: 1G1JF52T3T
Havent been able to figure this one out yet so customer is driving for a few weeks to see if failure becomes more consistent. Thanks for all your input. I rechecked tensioner & found that it is newer style that auto adjusts when pin pulled. Verified chain in t...
2004 Chevrolet Impala 3.4L Poor Idle Quality VIN: 2G1WF52E04
Thanks for all who replied. Kevin [...] of Johnstown PA hit it right on the head. Found rodent nest on top of ECM with 2 wires chewed all the way through both for IAC coil ground. Snap-on Vantage-Pro and Modis have pins B and D which are pcm + and have test... Trouble codes: P0507 (High Idle speed).
2006 Chevrolet Impala LT 3.5L cooler line VIN: 2G1WT58K66
Yes all replies were right on the money. Problem was the cooler was somewhat restricted- I should have checked that to begin with. Seems that most replies came from cold climates so I assume this a temperature related issue. Local GM dealer had no knowledge of...
2006 Chevrolet Express 3500 6.0L Misfire, MIL Lamp on VIN: 1GAHG39U46
i am calling this one fixed first thanks to all that replyed after replaceing the crank sensor i pulled the left valve cover and guess what # 5 rocker arm is woren and so is the tip of the valve as far asi can see i think the push rod is gloged with gunk this ... Trouble codes: P0300.
2002 GMC Sierra 1500 Denali 6.0L No Start, Stall VIN: 2GTFK69U32
Well, I found a 1 volt voltage drop on the cam sensor circuit. Gonna try a ignition switch. The circuit is fed from the switch. Otherwise, all powers and grounds are good.
2004 GMC Yukon SLE 5.3L abs VIN: 1GKEK13T74
Most replies i received were on the wheel speed sensors, I could not pin point which one was bad. The customer wanted me to make sure that the sensors were at fault. I tried to help people before with same problems and it got me with no pay deal. I just sen...
2005 GMC Envoy SLE 4.2L transfer case VIN: 1GKDT13SX5
So I dont know what's wrong with that transfer case. But its fixed. I replaced it with a known good t-case from a used envoy we have on the lot for sale, and now its quiet. We checked everything again, and again, and could not find anything wrong with any com...
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