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Prev Professional Automotive Repair Technical Discussions for May 5, 2014
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Open Help Requests for GM
Help Request Answers
2005 Buick LeSabre Custom 3.8L torque convertor VIN: 1G4HP52K15
Alright guys this car came in with the original complaint of customer notices a harsh shift into 1st gear. Scanned for codes and found P1811 max adapt and long shift. This diagnosis led to replacement of trans. Customer took over the weekend and returned wit a...
2003 Cadillac CTS Luxury 3.2L Charge Port VIN: 1GD6M57N53
Evacuate held good,recharged and also was good.went to takin charge line off and started sprayin.put back on,took low side off and also sprayed.never had both do it.sucked freon out and looked and to my surprise both cores are gone.anybody ever seen this?and r...
1999 Chevrolet Tahoe LS 5.7L MIL Lamp on, Intermtnt hard start VIN: 1GNEK13RXX
Check engine light comes on with codes p0172 and p0175. Intermittent hard to start cold. Fuel injection unit updated to mpi about 6 months ago to correct rich codes. Customer does not drive truck much, but cel came on last week, only 1300 miles since repair. T... Trouble codes: P0172, P0175
2003 Chevrolet Impala 3.4L Lighting VIN: 2G1WF52E23
Car came in with an intermittant check engine light and a solid service vehicle soon message on the cluster. Pulled a code p1811 and p1189. Pulled trans and had repaired and put a new oil pressure switch in. Came back a week later with service vehicle soon lig...
2005 Chevrolet Impala 3.8L engine VIN: 2G1WF55K65
We have tried everything on this car. Obviously tried two different coils (both cylinders are on the same one), two different ignition modules, two crank sensors, two harmonic balancers. Still miss under load. Please help, guys!
2007 Chevrolet Suburban 2500 LT 6.0L no commuication VIN: 3GNGK26K67
oil guage not working, shows 0 and low tire light on but i have no communication to the inst. cluster,or tpms modules,I can comm. with pcm,abs,found that i can't comm. with any modules on the low serial data circut, so scoped the pin 1 dlc circuit to the low s... Trouble codes: P0522
2009 Chevrolet Cobalt LT 2.2L Excessive Emissions, No Start, Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1G1AT58H39
Help me please. Car is very hard to start and will not idle on its own. Exhaust smells very bad when you can get it to run. It runs like exhaust cam is out of time. The ecm is commanding solenoid but the Exhaust cmp angle data reads 0 all the time. I have good... Trouble codes: P0014, P0106 (MAP pressure circuit out of range)
2001 GMC Savana 2500 5.0L Ebcm VIN: 1GTFG25M21
Unable to determine if I have a comm issue with EBCM. I can scan and get data from EBCM with scan tool but a module scan does not show EBCM on module list. also unable to clear rear speed sensor codes from module.. EBCM has two data lines Circuit 1807 to pin 2...
2007 GMC Yukon XL 1500 SLE 5.3L MIL/Stabilitrak VIN: 1GKFK16397
Hello to all; Got this GMC that came in with what seemed to be a straight forward issue. It had a P0300 code and once during diag it popped a P0305 code. Looked at the plugs they seem to be the original ones and did not look to good. Replaced them, but still h...
2006 Pontiac Grand Prix 3.8L MIL Lamp on VIN: 2G2WP58256
After driving 50 miles to set OBDII monitors mil is back on with same P0446. Cat conv not ready all other monitors included evap are ready. No TSB. cannot determined the cause. need help. Thanks. Trouble codes: P0446 (Evap Control Vent Malfunction)

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick LeSabre Custom 3.8L Excessive Emissions, No Start, Cuts out, Stall, VIN: 1G4HP54K81
Many thanks to all that helped with this troublesome night mare. In a nut shell: coils and crank sensor. In more detail...: (deep breath...) I found that when measuring the resistance between coil towers on each coil one of them was out of limits. It stil... Trouble codes: P0135 (O2 sensor B1S1), P0440 (Evap), P1351 (Ignition Coil I may have caused this code), P1374 (3x reference circuit problem).
1994 Chevrolet K1500 Cheyenne 5.7L No Start, Poor Idle Quality, Surge, Stall, Misfire VIN: 1GCEK14K5R
First off I must thank you guys for the help. Resoundingly you said it was a fuel volume issue and you were correct. I pulled the fuel pump expecting to find the talked about rubber hose rotted away but I did not find that. The rubber hose was actually in grea... Trouble codes: 21 (Tps out of range), 23, 25 (Iat sensor out of range low-high), 44 (Oxygen sensor system lean), 33 (Map sensor out of range), 41 (Ignition control circuit), 42 (Bypass circuit fault).
2002 Chevrolet Silverado 2500 HD 6.6L EGR Monitor VIN: 1GCHK29172
Thank you for all that replied to my EGR monitor that refused to run. After I posted this, I decided to drive it a little bit further and got the owner's permission to take it on an extended road trip to Reno. I replaced the air filter to a Delco unit even tho...
2007 Chevrolet Avalanche LTZ 5.3L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 3GNFK12387
I am posting this summary due to the time limit. Although I do not have a fix for this truck yet, I do feel we are on the right track. I had already checked most of the suggested problems, but rechecked all of them. The final reply from Steve for Texas may hav... Trouble codes: P2135 (TP 1-2 Correlation), P2119 (Throttle closed performance), P2101 (TAC Motor circuit range/performance), P1516 (Electronic Throttle Mod VS Throttle position performance), P2176 (Minimum Throttle Position not learned).
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