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Prev Professional Automotive Repair Technical Discussions for February 14, 2013
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Open Help Requests for GM
Help Request Answers
2004 Buick Rendezvous CX 3.4L No Start VIN: 3G5DB03E24
This vehicle came in on the hook with a no start. Fuel pump runs with the psi at 57 on the Schrader valve. Check for spark and it had it. Scanned the bcm data to make sure it wasn’t an anti-theft issue. We are good there. I checked the pcm for codes and it has... Trouble codes: P0420 (Cat eff code), P1819 (internal mode switch)
1984 Chevrolet Corvette 5.7L Battery VIN: 1G1AX078XE
Vehicle came in for battery drain. Isolated it to radio fuse. Pink and white wires were traced to lighting delay module under passenger compartment glove box area. Vehicle came in about a month later with same issue. Customer had stereo system and alarm system...
1996 Chevrolet Monte Carlo LS 3.1L No Start VIN: 2G1WW12M7T
this car is haunted i think lol it loses power to fuel pump for some reason. we switched out relay it stared right up then drove it for like 1 hour and shut it off went back to start it and it wouldnt start checked the power going to pump and there was none ag...
1998 Chevrolet C2500 Cheyenne 6.5L No Start VIN: 1GCGC24F5W
has no fuel to injectors, all normal up to PMD...tested PMD per manual and web and seems normal, even tried a used one, asking if anyone has detailed info on testing the injector fuel solenoid- not the shut off sol, but the one that the PMD drives, unable to l...
1999 Chevrolet Blazer 4.3L No Start
Vehicle came in no start. Checked spark at plugs found almost no spark. Checked at ignition coil found 30kv+ of spark. Decided to replace cap and rotor still no spark at plugs. Replaced cap and rotor again with better quality and replaced spark plug wires as p...
2004 Chevrolet Avalanche 2500 8.1L MIL Lamp on VIN: 3GNGK22G24
I need to know if anyone has had an encounter with one of these beasts. It has a 8.1 liter v-8 and it is 4 by 4 and has dual tanks in this avalanche 2500, this vehicle is supposed to have fuel transffered to the main tank whrn the pcm commands it, an... Trouble codes: P2636 (Secondary fuel pump flow insufficient)
2005 Chevrolet Silverado 1500 SS 6.0L Oil Pressure VIN: 1GBHC24U95
The truck was brought in for low oil level and low oil pressure messages. Customer added approximately 2 quarts of oil before getting here with the truck. My question is- Is this truck/engine designed to shut down automatically due to low oil pressure? There a...
2005 Chevrolet Silverado 1500 4.8L Communication VIN: 1GCEC14V55
I have a real tough one that I can't seem to figure out. The vehicle is a very clean work truck. On the instrument cluster none of the small (serial data) gauges work (Fuel, Coolant, Oil Pressure, Voltage) but the Speedometer and Tachometer function just fine....
2007 Chevrolet Silverado 1500 LTZ 5.3L not shifhting VIN: 1GCEK19J87
truck only shifts into second, with scanner hooked up i have a input and output reading. speedo, and tach works fine. when it shifts into second its a hard shift. while watching the scanner it commands all the way up to fourth gear. 1,2 sol is on and so is 2,3...
2001 Pontiac Aztek 3.4L engine VIN: 3G7DA03E81
Continuing problem with 01 Aztec: no crank, no start. No buss comm. Has power to BCM and PCM, power and grounds, fuses, all good. SP205 comb removed, and still no signal from anything in the system. We have no Tech scanner, just generics, but have no communica...
1999 Saturn SL2 1.9L Alarm system VIN: 1G8ZJ5274X
The alarm will intermittantly set itself and when the door is opened after being unlocked with the fob or key the alarm will go off untill you disconect the battery. The customer says they try all of the buttons on the fob and turning the key in the door or ig...
2001 Saturn SL1 1.9L Electronic VIN: 1G8ZH52801
This Car Bangs Into Gear. 1-2 Is Real Bad. Code P0746. I Checked The Wires Going Into Trans. For The PC Solenoid. The Connector Is Melted Where These 2 Wires Are Located. There Is Power On The Wire That Comes From The TRS LP Fuse In The Underhood Fuse Box But ...
2007 Saturn Outlook XR 3.6L abs VIN: 5GZER23767
i did a transmission on this outlook and now i have a traction control light on. codec co710. steering position signal fault. plausibility failue. systom 5a. alignment is perfect. does nopt pull. drives great. only problem is light. it disables traction contro...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Buick Rainier CXL 4.2L Encoder VIN: 5GADT13S74
After researching the replies , I see alot of 4 wheel issues with this model.The vehicle was "fixed" with a new encoder. But my question was why the repeat failures. We did inspect the ground , which is located under R/F corner of console .(I could have found ...
2004 Cadillac SRX 4.6L Misfire, MIL Lamp on VIN: 1GYEE63A94
THANKS FOR ALL THE [...] Cadillac SRX 4.6L Misfire, MIL Lamp on By: Ralph GermanottaJan 22, 2013 11:16:57 AM in GM [...] Replies please help car has been back a few times we replaced the engine sometime in nov 29, car keeps coming back to our sh... Trouble codes: P0138, P2135, P0300, P1101, P0101, P0420.
2005 Chevrolet Suburban 1500 Z71 5.3L lifters,oil pressure VIN: 3GNFK16Z85
Thanks for all the input guys.I figured probably oil pump problem but hadn't thought about seal on pickup tube.I would lean toward that,acts a lot like pulling in air and oil.Since mileage on vehicle,and also problem has been going on for several months,estima...
1997 GMC Safari SLE 4.3L Park lights VIN: 1GKDM19W5V
Thanks for all the help. I ended up following the ciruit and I found the brown wire rubbing on the frame in the front where the harness runs under the radiator and up to the RF park lights. Repaired the wire and repositioned. Everything works good now.
1999 GMC Sierra 1500 SL 4.8L radio VIN: 1GTEK14VXX
Thanks to all that responded.this one is fixed for now. I pulled the rgo1 fuse at left i/p fuse panel,several times radio came back on and stayed on when using turn signals.fuse must have been loosing contact and pulling it sveral times cleaned the contacts. ...
1999 GMC K1500 Suburban SLE 5.7L Misfire, MIL Lamp on VIN: 1GKFK16R5X
hey guys sorry it took so long to replay, but i finally got this figured out. So when we got the vehicle in i did the engine running compression and compared readings. everything looked good. then my nest choice was to pull the upper intake off, and then do th... Trouble codes: P0300, P0135, P0141, P0430.
2005 GMC Yukon XL 1500 SLT 5.3L brake pedal VIN: 1GKFK16Z95
Well this one still isn't fixed. I got a lot of good information and a lot of techs telling me that this is how hydro boost work. but this one works way different then any other hydro boost system that I've drove or worked on. Even the customer says they just ...
1998 Oldsmobile Achieva S 3.1L MIL Lamp on VIN: 1G3NL52MXW
The customer had some unexpected large medical bills for two of their disabled family members. They did not have the money to do any more repairs at this time. We were going to try replacing the down stream oxygen sensor and if that did not work, replace the c... Trouble codes: P0420.
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