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George H.
George H., ASE Certified Technician
Category: GM
Satisfied Customers: 18759
Experience:  15+years ASE Master W/L1 Drivability
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What does engine hot a/c turned off on my dic mean

Customer Question

what does engine hot a/c turned off on my dic mean
Submitted: 6 years ago.
Category: GM
Expert:  George H. replied 6 years ago.

This means that the powertrain control computer thinks the engine is hot, if you have replaced the engine coolant sensor the wire between the computer and the sensor may be shorted to ground. Do you have a check engine light on?


The sensor you replaced was on the left side of the block halfway back?


Check the wiring to see if it is melted to the header or pinched to ground, after that you will need a voltmeter at the least and maybe a scantool to see the temperature at the computer.


let me know what I can do to help you with this


Thank you



George H. and 2 other GM Specialists are ready to help you
Customer: replied 6 years ago.
yes the sensor that i replaced was on left side and the check engine light is on
Expert:  George H. replied 6 years ago.

Sorry for the late reply, I was not notified that you had responded,


Check for voltage to the sensor with the key in the run position, if you have no voltage the signal line is grounded and the next step would be to disconnect that wire from the powertrain control module and measure at the module to see if it is still grounded, if it is then the problem is internal to the module and the PCM would have to be replaced.


if the module now produces a refrence voltage then the problem is between the module and the sensor.