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Open Help Requests for GM
Help Request Answers
1991 Cadillac Eldorado 4.9L Display
We have this older Cad here that is displaying "Service CCR System" in the driver information center. My question is---just what is a "CCR System"? We have no reference to anything regarding this message. This is too old for SI and we dont even have any paper ...		 View
1996 Cadillac Fleetwood 5.7L MIL Lamp on
System was fine for about 2 months but the cel light keeps comming on intermittantly with 1415 code in memory. Long and short fuel trims + or - 3 I can trigger the pump on and off with scanner and you can see the difference with the oxygen sensors right away. ... Trouble codes: 1415.		 View
1997 Cadillac Seville 4.6L Blower Motor
Car came to us with the blower not blowing. I took off the blower motor connector, and re-connected it. blower motor worked... we gave to car back to the custormer... they came back about a month later with the same deal. i then disconnect the blower motor con...		 View
1989 Chevrolet Camaro 5.0L Cuts out, Stall
OK..I dont ask for help much on here but I got one thats drivin me crazy. I am a Honda tech but IM working on this one at home. I do have some previous GM experience but I need you GM guys to help me out on this one. Here goes. This IROC was brought to me with...		 View
1994 Chevrolet Pickup 6.5L MIL Lamp on
Truck runs ok, no stalling, a little hard to start but not bad for the mileage. Have read the updated TSB but it only confirms what I already knew...the problem is intermittent..end of trouble tree...gotta love it. Injection Pulse width is not frozen but hover... Trouble codes: 35 (36 -), 36.		 View
1996 Chevrolet Lumina 3.1L TCC operation
After installing used trans, unit works good, shifts good and TCC applies. Everything is normal until reach 68 MPH, then TCC starts toggling off and on rapidly, ran it up to 85, still doing it. TCC enable and TCC command both turn off and on when it toggles. T...		 View
1997 Chevrolet Pickup 5.0L steering box
thanks in advance we have a truck here that when driving will take off to the right he has new tires steering box tires alignment, going to left is fine any suggestions would be appreciated		 View
1997 Chevrolet Pickup 5.0L Steering
just to update and make more clear my problem with this vehicle #1 sorry about the kilometers it is not [...] is 225403 anyways this truck when at idle and not moving will act up. steering is smooth and constant,start moving and jerky what happens is an...		 View
1999 Chevrolet Pickup 5.7L fuel
truck came in no start,hooked modis up found p1626 & u1192 did the vtd relearn truck started fine,clear codes,p1626 came right back.after trying to start again no start did relearn worked fine.i dont know much about this code,is it something dealer has to fix ...		 View
2000 Chevrolet Silverado 5.3L no 4wd
cust brought in a few months back with truck stuck in 4wd high, service 4wd light on. had code stored for encoder circuit failure. tested and had no powe to encoder motor. found mice had chewed throug wires. repaired wires and had power at encoder. system work...		 View
2001 Chevrolet Silverado 6.6L Low power
Hello all gm diesel techs. This truck came in with bad head gaskets. It ran good just couldn't keep the coolant in the bottle. We replaced the head gaskets, milled the heads .006" used arp head studs. After the truck was reassembled it runs great, just no powe...		 View
2002 Chevrolet TrailBlazer 4.2L ride hieght
Thanks in advance. I have a customer from the dealer that has a 2002 trail blazer. Front Z height is to low. I cann't get enough positive camber to stop tire wear.I think that this may be a front spring problem. Has anyone seen this? thanks Tom		 View
2002 Chevrolet Impala 3.4L carpeting
i have a 2002 chevy impala that the p/s rear carpeting keeps becoming soaking wet. i have taken car to the car wash and preasure washed it to check for leaks. found none. had front windshield resealed.( customer had informed me that the windshield had just bee...		 View
2002 Chevrolet Silverado 4.8L frt differntial/wheel
Test drove vehicle and customer was with me. He said notice the noise about two weeks ago. when making a turn seems to be more to left has a noise that would put you in the mind of a brg but only does in turn and sometimes has a churp in it. may chirp once or ...		 View
2005 Chevrolet Impala 3.4L noise in the passenger compartment
hey guys we got a weird one here. this '05 impala has us scratching our heads. customer has complaint about a low humming noise in the passenger compartment. here's where it gets weird if we unplug the fuel pump or the alternator, or remove the vacuum tube off...		 View
1996 GMC Pickup 6.5L Excessive Emissions, Poor Idle Quality, MIL Lamp on
Truck came in with no power, and smoking at idle. It has P0216 and P1214 codes in the computer. Driver module was replaced today, but did not help. It runs good until it gets hot; then the timing goes to 0-1, when it is calling for 8-9. If you accelerate the e... Trouble codes: P0216 (Injection timing congrol circuit), P1214 (Injection Pump Timing Offsett).		 View
1995 Oldsmobile Aurora 4.0L no power
car came in with miss,found bad plug.replace plugs and miss is now gone,but the car has no power and vacuum is low.car runs good but has no power at all.I have block egr valve,and brake booster,no help.sorry I can't give you any data I don't have a scanner for...		 View
1995 Pontiac Firebird 5.7L No Start
i installed new msd dist, 2 known good used computers,new coil,car has injection pulse, no spark or rpm,car turns 100%, checked red on wire to dist is good grounds are good, no codes for dist.if you pull dist out and spin by hand has little rpm but no spark. t...		 View
1997 Pontiac Grand Prix 3.8L Misfire
Hi everyone, I have a supercharged 3.8L that misfires on #2 for about 14 times on a snap throttle. The car came in for a solid misfire on #1 found a cracked plug, now miss is gone except for snap throttle. I have installed new plugs, switch plug wires, ICM, sc...		 View
1999 Pontiac Montana 3.4L harsh up shift
Good day people. I have this 1999 Pont. Montana that will have a very, very harsh up shift intermittently. This condition will happen once or twis in every two weeks. This condition was there before the transmission was rebuild. When it happens it will keep sl...		 View
2003 Pontiac Vibe 1.8L abs
I need some help on this one. I've just replaced the EBCM the other day, bled the brakes all around, and went out on a road test. The ABS light came back on with codes; C0273 ABS relay circuit, C1241 Battery voltage. I've checked all grounds, power inputs, bat...		 View

Fixes & Summaries for GM
Fix/Summary Answers
1996 Chevrolet Tahoe 5.7L Engine
thank you to all that replied. I found both signal wires to the crank sensor shorted together. That masked the signal test at the ECM.		 17
1997 Chevrolet Pickup 4.3L Hesitation, Cuts out, MIL Lamp on
Ok thanks for the replys. The high b1s2 reading was really bugging me so I decided to concentrate on that for a while. I noticed that even when the truck was off with the key on the b1s2 o2 was still reading over 1000mv so I unplugged the sensor (what I though...		 5
1999 Chevrolet Malibu 3.1L Stall, Misfire
Thanks for the overwhelming number of replies. This car is finally fixed. It was a costly learning experience. Most of the replies referred to problems with the lifters. We removed them and cleaned them and the car ran well afterward. There was one lifter tha...		 55
1999 Chevrolet Tahoe 5.7L Cuts out, Stall, MIL Lamp on
thanks to Mark from Minnesota the problem was wires just below alt . the loom that ckp wires are in is also wraped in silver heat tape . the heat tape looked fine and the loom was in it's little wire loom retainers but when i felt the loom it felt crunchy i pu... Trouble codes: po339 (ckp intermintant).		 5
2003 Chevrolet Silverado 5.3L rear prop shaft speed sensor
well i received an over whelming replies that stated to reflash transfer case control module per tsb.upon closer review of some data i found i had over looked this tsb[stupid human].so i verified my signal at tcm and sent vehicle to dealer for update,custome...		 5
2007 Chevrolet 4500 6.6L Hesitation, Poor Fuel Economy, No power
The truck is not fix due to us not having the manual so until then, I will post what I have learn. First thanks to Frank and the rest of the guys for giving me such information. The catalytic convertor thing is called a Diesel Particulate Filter (DPF)and is ... Trouble codes: P2463 (Undocumented), P244B (Undocumented), P2033 (Undocumented), P0546 (Undocumented).		 7
2003 GMC Envoy 4.2L contols
I have tried the relearn procedure but the dash vents are still inop. It looks like the problem is the mode actuator door as some of you stated. I will have the dealer diagnose this. I replaced the abs module & reflashed. Thank you for the info.		 5
2004 GMC Sierra 6.6L MIL Lamp on, black smoke
This lovely thing beat me up good. I made an interim fix of soldering a 2k resistor between the MAF signal and the MAF signal return line which dropped the reading on the voltmeter (and scan voltage pid) to 1.1 volts and 44gps scan reading of MAF. This elimi... Trouble codes: P0101 (MAF Performance).		 6
1999 Oldsmobile Alero 2.4L Water Outlet
I have not repiared this vehicle, the customer did get a new water outlet and we checked everything again and did not see anything that should cause the problem. I do expect her back in 4 to 6 weeks.		 3
2002 Oldsmobile Alero 3.4L Fuel Pump
Hello All This one is fixed. Most of my replies were right on, it was a voltage drop causing my trouble. Where the connector goes through the floor, the pin for fuel pump power was corroded. I could not light a headlamp with jumper wires at the connector...		 27
2005 Pontiac Grand Am 3.4L cruise
well guys as luck would have this morning another grand am came in needing a clockspring. i took cruise switches off that one tried it on this one and guess what, cruise works fine but scanner still says inhibit via abs?thanks to michel and kasey for their inp...		 2
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