2003 GMC Envoy SERVICE ENGINE SOON LIGHT ON

Tiny
PHOOD1974
  • MEMBER
  • 2003 GMC ENVOY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 94,000 MILES
READING CODE PO 128 ECT ENGINE COOLANT TEMPERATURE WHAT DOES THIS MEAN
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Friday, February 26th, 2010 AT 9:46 PM

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Tiny
HMAC300
  • EXPERT
Ti means that either your coolant temp sensor is not working right or your thermostat isn't bringing theengine up to correct operating temperature. You needa special tool to replace teh temp sensor so have a pro look at it.
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Sunday, February 28th, 2010 AT 10:47 AM

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