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helloamd

helloamd 5/15/2012

2006 Buick Rainier CXL 6 Cyl 4.20L

Engine

What is P0128 diagnostic read out code?

Engine light on.

1 Answer


CVO

CVO 5/15/2012

These are the symptoms.

Trouble Code: P0128
Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Possible Causes:

DTC P0128 occurring with insufficient vehicle interior heating is an indication of improper thermostat operation.
Corrosion in the ECT sensor terminals or the ECT harness connector results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
A slight to moderate resistance in the ECT sensor signal circuit or low reference circuit will affect this diagnostic. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.

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