Question about 2001 GMC Sonoma Extended Cab

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My 2001 Sonoma's service engine soon light is on despite extensive work on the engine. The local dealer says it is probably the on-board computer which will cost a little over a thousand dollars to repair.even though the engine works great. How do I know that this is in fact the problem?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 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

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  • 400 Answers

SOURCE: PO128 - ECT engine coolant temperature sensor defective

The thermostat has stuck open. Or you are low on coolant becasue of a leak somewhere. Either way once it sets the code you will need to fix it to make it not set again. The t stat is not easy it's not the one on top of the engine it's on the side behind the alternator.
Also make sure the water pump doesn't have any play. Grab onto the the fan and move it front and back, If there is a clunking feeling or you can see it move alot then you need to replace that also.
Just make sure it's not running when you try and grab the fan. LOL

Posted on Oct 13, 2009

cooper0365
  • 347 Answers

SOURCE: 2001 gmc safari flashing service engine soon light

id check mas air flow sensor maybe 02 sensor might bet the mas sensor

Posted on Oct 19, 2009

  • 3 Answers

SOURCE: service engine soon and reduced engine power

disconnect batt. for 30 min. then reconnect,if no problem exist the lights will go away

Posted on Dec 20, 2009

SOURCE: 1996 GMC Jimmy has Service Engine Soon Light On.

Do you have a schematic and understand your
vehicles EVAP System?

Then you can work on it yourself

Posted on Feb 26, 2011

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