Question about 2001 GMC Sonoma Extended Cab

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Service engine soon light has turned on and off 4 times over the last six weeks. The last time it happened the truck suddenly lost power and began to stall. Managed to keep it running by feathering the accelerator, and finally power returned after about 1/4 to 1/2 mile. Repair shop found error code for throttle pedal positioning sensor with scan, but service engine light went off before further investigation could pinpoint the problem. Since then truck has been running properly. The only other symptom I have seen is that some times when slowing down to stop for traffic lights the idle does not always drop to normal idle speed. Any thoughts on the real problem???

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Posted on Jan 02, 2017

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SOURCE: Problems with stalling and high idle

take to dealer for pcm update

Posted on Sep 13, 2008

  • 29 Answers

SOURCE: GMC Sierra 1500 power loss at 1/2 throttle and above

i had this problem when the engine goes into protect mode you will have to reset with a scanner and reset the fuel air mixture cause it dont reset it self i hate these computer model car

Posted on Oct 27, 2008

  • 150 Answers

SOURCE: 1997 GMC Suburban losing power hesitation

I just went through this with a ford at the shop we threw parts at this car for days. It turned out to be the PCM. You can have all the best fuel pressures plugs, and MAF input but if the computer isn't reading it properly it can't work properly. The batterybeing disconnected is resetting the PCM taking it out of limp mode thats why it runs ok for short bursts. Its probably over-heating.

Posted on Feb 01, 2009

  • 188 Answers

SOURCE: Truck losing power and service engine soon light on

Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.

Posted on Feb 02, 2009

  • 54 Answers

SOURCE: Check engine light is on and high idle (1500rpm)

Check for a vacuum leak.

Posted on Feb 03, 2009

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