Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 8, 2014
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
2002 Chevrolet Suburban 1500 LT 5.3L MIL Lamp on VIN: 3GNFK16T92
Here goes-My nightmare begain with "light has been on for two years but runs well except for hard warm restart-traced to bad fuel pump check valve-replaced pump and filter starts fine now BUT the mil is on in 10 min with p1133/p1153(after about 20 test drives ... Trouble codes: P1133, P1153, P0134
2006 Chevrolet Cobalt LS 2.2L No Start VIN: 1G1AK55F26
please this post is only for techs that are familiar with pcm programming on gm products I got no communication with pcm & body modules, all comm wiring check ok, no short to power, ground, or open circuits. customer got me 2 used modules, ? can used modules b...
2007 Chevrolet Silverado 2500 HD LT 6.0L Dash shows service Trailer Brake VIN: 1GCHK29K87
Hello Group after spending hours with this system I would like to post this so others may have an easier time This Truck is used by a contractor to tow a Bobcat on Trailer they say the electronic Trailer brake system works real nice when working we had codes C...
2007 Chevrolet Suburban 1500 LS 5.3L MIL Lamp on, No power VIN: 1GNFC16J67
Vehicle has intermittent mil and limited power mode. Have not duplicated problem yet. Inspected connections and harnesses with no sign of problem. During accelerator pedal depression with key on engine off throttle actuator makes a clicking noise louder at one... Trouble codes: P1516 (Throttle actuator position error), P2101 (Throttle actuator position erroe)
2005 GMC Sierra 3500 SLT 6.6L Compressor VIN: 1GTJK33275
HELP!!!Thanks for looking first of all! This truck came in with a complaint of the A/C not cooling off. We put the gauges on it and the hardly moved. We evacuated what little 134 it had in it (8oz), vac't it , and charged it back to specks (1.7 lbs I believe) ...
2005 GMC Sierra 2500 HD SLE 6.6L No Start VIN: 1GTHK23205
We have no injector pulse at injectors. We have tried a known good crank sensor with no luck. Voltage 1 circuit(s) into FICM is battery voltage, 12.4v, KOEO. Voltage drop on grounds at FICM is less than .09v. Injector supply voltage from FICM is 3.5v on connec... Trouble codes: P089, P1093 (Fuel rail pressue low under load.)
2006 GMC Sierra 1500 HD SLT 6.0L power steering pump VIN: 1GTGK13U46
Customer afterward noticed that steering and brake assist would intermittently fail at lower rpm. Power steering pump was replaced, ok for a short time then resurfaced. Pump replaced again, then noticed brake pedal began to "kick" when applying brakes. Hydrobo...
2009 GMC Sierra 1500 SLE 5.3L No Start, MIL Lamp on VIN: 1GTEK29079
The customer's concern is, once in a while the truck will crank but not start. If he turns the key off, and then tries again, it will start. Someone here has witnessed It one time. The Check engine light is on all the time. The P069E is obviously set because o... Trouble codes: P0193 (fuel rail pres sens A circ high), P0641 (sensor ref volt A open), P06A6, P069E
1994 Oldsmobile 88 Royale 3.8L Misfire VIN: 1G3HN52LXR
coil 1/4 has no spark output, tried known good test coil, wires and test Ignition Control Module (icm) still now spark from 1/4 coil, used lab scope and cked crankshaft sensor 3x and 18x and showed fine at icm but 3x signal is showing only 1 volt.

Fixes & Summaries for GM
Fix/Summary Answers
2005 Cadillac SRX 3.6L Poor Idle Quality, Stall, Misfire VIN: 1GYEE63765
Thanks to everybody that replied,just running out of time here... so far after cleaning maf and tightening (what it seemed to be) a loose ground on the intake manifold this car is running good, even though the codes came back. but we will be replacing the maf ... Trouble codes: P2178, P2180.
2008 Chevrolet Suburban 2500 LT 6.0L MIL Lamp on, limp mode VIN: 3GNGK26K98
Scoped hi speed data line and found 7.5V toggling and intermittent 0V when problem would occur. Data lines should toggle at 2.5V. While observing scope disconnected and bypassed transmission connector data lines. Voltage went to 2.5V toggle. Replaced transmiss... Trouble codes: P0700 (Transmission control Module), U0121 (lost communication with abs system), P0575 (cruse control switch signal circuit), U0102 (lost communication with Transfer case control module), U0100 (lost communication with ECM/PCM), U0140 (Lost communication with Body Control System Erratic).
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next