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Prev Professional Automotive Repair Technical Discussions for April 19, 2013
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Open Help Requests for GM
Help Request Answers
1996 Cadillac Fleetwood 5.7L low power/vacuum VIN: 1G6DW52P8T
Customer complaint is low power and check engine light on. The fuel pump solved part of the low power problem, but it is still weaker than I would like to see for an LT1, and it is continuing to set lean codes. I also have an evap problem, but I have isolated ... Trouble codes: P0171 (lean bank 1), P0174 (lean bank 2), P1171 (lean during acceleration)
2004 Cadillac CTS 3.6L EVAP purge valve VIN: 1G6DM57774
2004 Cadillac CTS 3.6V-6 keeps setting a P0443 ,sometimes a P0300 and P0304 when driven.P0443 come back seconds after start-up.ALLDATA tests for P0443 code seem to indicate a bad driver in the computer.Purge won't actuate with scan tool.A class instructor said...
2004 Cadillac DeVille 4.6L windows VIN: 1G6KD54Y94
I have this cadi, that came in with a intermit right front window inop, so at customer request I replaced window motor and regulator, cust still had intermit RF window inop, along with all the other windows. check the 30 amp circit breaker and found to be melt...
1996 Chevrolet Blazer 4.3L Brake VIN: 1GNDT13W5T
Came from another shop they indicated that the master cylinder was replaced for a low pedal. That did not change after new master was installed. They installed old master and told customer they cant fix. We get we perform full bleed procedure including the abs...
2006 Chevrolet Silverado 2500 HD LT 6.6L Tcm VIN: 1GCHK23D66
Truck came in from ford dealer to have tcm replaced and programed, replace the module with a new module and went to program and there is no communications...had some used modules and tried them,still no communications. Replace glow plug control module then ecm...
2002 GMC Sonoma SL 4.3L MIL Lamp on VIN: 1GTCT19W22
Generally speaking a heater circuit code does not present too big a problem unless the wires are shorted or broken, but this is not the case here. All purple and purple/white wires intact and not grounding anywhere. So back to my wiring diagrams and I find the... Trouble codes: P0155
2005 GMC Envoy SLE 4.2L Powertrain VIN: 1GKDT13S55
Vehicle was towed in with a Reduced Power Light and Check Engine Light on. Problem is intermittent and does not do it all the time. When it does act up vehicle will not go over 20 mph and no power. Did all the Pinpoint Tests related to the trouble codes and th...
2005 Other GM rodeo 3.0L Excessive Emissions, Hesitation, Surge, MIL Lamp on, blows white smoke VIN: MPATFS77J5
HI GUYS, I need a bit of guidance here not a diesel specialist but this customer is a regular and has a fleet of cars we service. The vehicle was towed in and wouldn't start.It would crank but not start.I removed the diesel filter and it was full of water.Re... Trouble codes: P0216

Fixes & Summaries for GM
Fix/Summary Answers
2007 Cadillac DTS L 4.6L Air Ride Level VIN: 1GEEH06Y67
have been trying to locate grounding wire thru harness - only seems to drop now when you go over bump & have body twist. will post fix when I find it.
1968 Chevrolet C10 Pickup 5.3L Engine VIN: CE248Z1721
Hello, Thank you for all the replies that we have received. We checked the distributor, oil pump shaft, fuel pump, Oil pump and screen, couldn't find anything wrong. We changed the Oil pump, shaft and screen anyway since we dropped the oil pan to inspect. We a...
2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK29143
you guys all hit the nail on the head. i rechecked fuel return and had over 30ml on left bank. replaced left bank injectors and now truck starts perfectly. thanks to all who replied.
2006 Chevrolet Uplander LT 3.5L steering VIN: 1GNDX33L16
Thanks to all who responded. looked for all the usual issues. Hoses were all ok. This vehicle does not have a remove reservoir. We ended up flushing the system and so far all is well. Thanks,
2007 Chevrolet HHR LS 2.2L steerig VIN: 3GNDA13D07
it was a 60 amp fuse under the hood thanks to everyone who replied thanks again jim
2007 Chevrolet Silverado 2500 HD Classic LT 6.0L Hesitation VIN: 1GCHC24U47
This truck is partially fixed. The lean code went away after I changed the spark plugs and it idles much smoother also. The cat code is still there and the check engine light goes on after I drive a couple of miles and come to a stop and after idling for a sho... Trouble codes: P0420 (Cat sys efficiency below threshold bank 1), P0174 (Too lean bank 2).
2004 GMC Savana 3500 6.0L Oil pressure VIN: 1GDJG31U84
Customer had engine replaced, no more problems. Thanks everyone for your opinions.
2007 GMC Savana 3500 4.8L Cat VIN: 1GDGG31V37
OK, I really appreciate all the input and understand that the "real fix" is to install OEM cats. I have educated the customer (as well as myself) on the smaller aftermarket cat's surface areas which in turn only allows for smaller portions of the precious meta...
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