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1998 GMC Sierra 1500 Base Reg Cab 117.5 WB

1998 GMC Sierra 1500
Trim Info:
Rear Wheel Drive, Reg Cab 6.5' Wideside
17 mpg city / 23 mpg hwy
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November 1, 2011, 3:52 pm

Cody H
 

Question: what does "Engine coolant temperature sensory circuit high temperature low" mean?

I have a 1994 gmc sierra and i have had this code show up recently and have tried all i can think of to fix this. Any advise??


November 3, 2011, 9:17 pm

Elizabeth K
Expert Mechanic

If you post the exact code I can give you a better description, but it sounds like the coolant temp sensor is expecting to see a certain high temperature and either the coolant is not getting hot enough (thermostat stuck open, or very low coolant) or the temp sensor is faulty.

I'd start with checking that the thermostat is closing when it should and the engine is getting up to normal operating temperature. What have you done already?


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