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Prev Professional Automotive Repair Technical Discussions for March 5, 2007
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Open Help Requests for GM
Help Request Answers
1992 Cadillac Seville 4.9L No Start VIN: 1G6KS53B1N
This Caddy came in on the hook as a No Start. The coil mounted on top of the Dist. was bad. Replaced it along with a cap and rotor. The car now starts and runs fine at idle. Have not driven the car because, with the plastic cover off from the coil it appears t...
2004 Cadillac CTS 3.6L Electric Windows VIN: 1G6DP56785
Hi everybody, i have this Cadillac CTS that have all the 4 power windows not working, if i press on the buttons i will hear the relays for the door control modules clicking but the windows don't go up & down. Any help will be appriciated. Best Regards
1986 Chevrolet K20 Scottsdale 5.7L fuel gage VIN: 1GCGK24M5G
The fuel gage only reads half full when tanks are full, has dual tanks. I am getting 93 to 95 ohms at dash pink wire, that goes to the fuel gage, with dash connector disconnected from dash, when switching the tank select switch back and forth. With the connect...
1993 Chevrolet K2500 Cheyenne 6.5L Engine VIN: 1GCGK29F9P
This is one for the Diesel guys out there. I have a nice clean truck with a blown 6.5 turbo diesel. I also have a 6.2 long block non turbo sitting around. With the exception of the c.i.d. what makes these engines diferent and is it posible to use the 6.2 long ...
1999 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Hesitation, Misfire VIN: 1GNEK13R6X
Cylinder 6 missfire, only while driving under light acceleration, heavy acceleration=no miss. Had spark at all cylinders but cap and rotor were corroded, replaced with new. Unchanged. Swapped cyl. 8 and 6 wires, unchanged. Checked plugs, Delco platinums only 6... Trouble codes: P0300 (Random multiple missfire)
1999 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 3G1JC1246X
Call deler asking for #pcm , [...], take out car PCM same number , diconect bat same codes . I found use PCM tmorrow I will change , but first I redy for you help Trouble codes: P0405, P0404 (EGR Recirculation circuit low)
2000 Chevrolet Impala 3.4L low coolant indicator VIN: 2G1WF55E8Y
we've replaced many of these sensors without any problems. we have also found a bad radiator cap can cause the light to come on. we can't keep this one from coming back on. thanks
2001 Chevrolet Silverado 2500 HD 6.6L low power VIN: 1GCHK29101
have not had alot of experience with the duramax but here are some of the test and reading which have been taken. vacuum at fuel shrader- (5 inches of vac holding 2 inches) fuel rail pressure idle- (desired 4930) (actual 5300) wot under load - (desired 31,00... Trouble codes: P0237
2002 Chevrolet Suburban 1500 LS 5.3L charging system VIN: 3GNEC16ZX2
Greetings fellow techs, I have a 2002 Chev Suburban here with a charging system problem. It also has a history code p1637 which I cannot find a flow chart for. The description is generator l-terminal circuit fault. I have viewed the data on the scan tool and n...
2002 Chevrolet Impala 3.4L Engine VIN: 2G1WF55E12
The Impala has a screech from engine under load, it only happens on moderate or heavy acceleration, sounds simmilar to a belt squeel, or air whistling. It will do it in the bay if throttle is burped, but goes away imediatly. It only stays consistent if loaded ...
2004 Chevrolet Impala 3.8L temp gauge VIN: 2G1WF55K04
I need a second opinion. The temp gauge pegs on this vehicle, and when I turn the key off, it does not go back to 0. The actual temp is normal. I disconnected the instrument panel and inspected all connectors. They looked ok. Reconnected the panel and tried. T...
1991 Geo Prizm 1.6L No Start VIN: 1Y1SK546XM
Hi Everyone it's my week to not be able to fix anything!This 1 came in on tow truck with no start.Checked for spark at plug none there.Check'd for sec.spark from coil none there.According to Nodata i ohmed the coil it was ok,did the ohmn tests for pick up and ...
1993 GMC K1500 Sierra 5.7L Hesitation, Surge, Stall VIN: 1GTEK14K1P
This GMC has a problem with a surge/hesitation/occasional stall on acceleration when it is transitioning from cold to hot. It runs great when first started, it also runs great once it has warmed up. The problem is worse the colder the outside temperature is. I...
2001 GMC C7500 8.1L no acceleration VIN: 1GDM7H1E71
Good morning and welcome to my nightmare. Truck was brought in from a shop that does most of it's own work, and given to me to fix after he gave up. This truck will not accelerate when you step down on the pedal"it just idles" I scanned for codes and and came ... Trouble codes: P1515 (throttle range error), P0405 (egr)
2004 GMC Yukon XL 2500 SLE 6.0L Steering Angle Sensor VIN: IGKGK26U64
Diagnosed using TECH2, and codes obtained are: C-0253: Centering Error, C-0455: Steering position sensor circuit Malfunction. I Did Aligment Learn Procedure using Tech2 Functional Test and follow scan tool instructions but at end of process it says: ALigment u...
2005 GMC Sierra 2500 HD 6.6L frame VIN: 1GKC2567R8
Has any body seen a cracked frame on a similar truck the upper deferential mount broke right off the dealer said its from over loading. The weight Truck was 500lbs over its recommend specs all loaded up .Hmm I donít think it should have broke because my two fa...
1994 Oldsmobile 98 Regency Elite 3.8L Hesitation, MIL Lamp on VIN: 1G3CW52L9R
see history comments for complete story no pcm communication car has no power and has had codes at last visit 2 weeks earlier. Trouble codes: P0321 (spark reference lost), P0341 (camshaft crank error), P1361 (ignition controll toggle error)
2000 Oldsmobile Silhouette GL 3.4L Inst/Radio VIN: 1GHDC1358Y
Van came in with lights burned out in speedo. Bulbs solder in, and cannot be purchased new or aftermarket, so I opted for a used instrument cluster. Installed it, and it works fine, but radio display now says, LOCKED and only the clock functions. I went throug...
2005 Pontiac Grand Prix 3.8L Cruise control VIN: 2G2WP52275
Cruise inop. P0573 cruise brake switch circuit current. SI flow chart lead us to replace and reprogram BCM. No change. Tech 2 shows applied voltage at 9.2 and released at 6.5V. 10V feed to brake light switch OK. Signal side of the switch does not match voltage...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G6CD5338L
I have to close this help request because my 30 days is almost up. However I am expecting to get this car back in my shop later this week. I have alot of testing to do from the suggestions that all the members gave. I wish I would have gotten this car in soone...
2001 Cadillac DeVille 4.6L Starting VIN: 1G6KD54Y51
As many fellas' suggested they have seen pleny of problems with the ignition switch. I could not get any failure out of the part, but informing the customer that would be our best guess, he authorized replacement, and haven't seen him back yet!!! Thanks for ...
1993 Chevrolet Astro CL 4.3L transfer case VIN: 1GNEL19W5P
Thanks to all that replied. Vehicle is fixed! Salvage yard sent another transfer case and luckly this one works. I'm sure the binding problem on turns was the viscous clutch inside transfer case was seized. Stan
1994 Chevrolet Corsica 3.1L suspension VIN: 1G1LD55M4R
FIRST thanks for all the replies you are all very much appreciated for the time spent sending the help--now for the fix as i stated i had already replaced the lower controll arm bushings and for dale from ILL you can get the bushings and replace them even the ...
2000 Chevrolet K2500 6.5L No Start, Stall VIN: 1GTGK29F8Y
Received many replies suggesting the fuel pump or driver. This truck still was under warranty for the pump although gm has a strick policy on pump replace. I deliveried the truck to gm for my customer. The next day my customer called me and said GM would not d... Trouble codes: P1626 (Theft deterrent passlock problem), U1192 (theft deterrent).
2003 Chevrolet Trailblazer North Face 4.2L MIL Lamp on VIN: 1GNET16S13
I decided for the price of a cam sensor just replace it. Light has not come back on. As for the cruise customer has not had problem again. Thanks for all the replies Trouble codes: P0340 (cam sensor).
1997 GMC Savana 3500 4.3L Misfire VIN: 1GDGG31W1V
Thank you for all the responses. I tried to get more lab scope readings Monday while the problem was present but the vehicle never acted up all day which was unusual, and the customer planned to pick it up. Several techs recommended replacing the distributor, ... Trouble codes: P1345.
1998 Pontiac Trans Sport 3.4L Reverse
Sorry for the delay in closing this, first off thanks for the input, we looked at all avenues and because it's my father in laws van we decided to replace the trans with a SRTA (service replacement transmission assembly) from GM that will have all of the lates...
1999 Pontiac Grand Am GT 3.4L Serpentine Belt VIN: 1G2NW52E3X
Thanks to all that replied. All responses were very good ideas. It did end up being the power steering pulley. Someone must have pulled the original one off before and when I put a new one on and installed it in the same place it was out of alignment by about ...
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