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PO118 Fault Code on 2000 Jeep Grand Cherokee: ECT Sensor Issue and Cooling Fan Not Operating

Model: 2000 Jeep Grand Cherokee Fault Code: P0118 Posted: 2010-05-01 17:45

I own a 2000 Jeep Grand Cherokee that has triggered a PO118 diagnostic code. I measured the voltage at the Engine Coolant Temperature (ECT) sensor and obtained a reading of 5V, which is within expected range for normal operating temperatures. Despite replacing both the cooling fan and thermostat, the fan still does not activate. Given this behavior, could the issue be related to the ECT sensor itself? I'm seeking expert advice on whether the PO118 code points directly to a faulty ECT sensor or if there are other potential causes that should be investigated first.

Related fault codes
P0118
Comments (1)
Anonymous 2010-05-02 06:58

I recommend reviewing the official diagnostic code explanation for PO118 on the manufacturer's support page. This resource typically provides detailed information about what the code means, how it relates to sensor readings, and possible root causes—such as ECT sensor inaccuracies or wiring issues—that could explain why the cooling fan isn't activating even after component replacement.