2003 GMC Envoy SERVICE ENGINE SOON LIGHT ON

2003 GMC ENVOY
94,000 MILES • 6 CYL • 2WD • AUTOMATIC
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PHOOD1974
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  • 1 POST
READING CODE PO 128 ECT ENGINE COOLANT TEMPERATURE WHAT DOES THIS MEAN
Feb 26, 2010 at 9:46 PM
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HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
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.
Feb 28, 2010 at 10:47 AM
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