Engine Conrtols - Got DTC P0128? Replace PCM

SOURCE:
Honda Service News December 2004

TITLE:
Got DTC P0128? Replace the PCM

APPLIES TO:
2003-04 Pilot

SERVICE TIP:
Go a DTC P0128 (cooling system malfunction), but you can't find anything wrong to account for it? A faulty PCM could be the culprit.

During a cold start, the PCM monitors the engine coolant temperature (ECT) and calculates an expected coolant temperature. If the expected coolant temperature is a lot higher than the ECT reading, the PCM sets DTC P0128.

Some driving and climate conditions can cause the PCM to set this DTC when there isn't a problem with the vehicle. If you've got a DTC P0128, then replace the PCM with the appropriate part from this table: