Diagnostic Aids

When DTC P0125 is set, ECT sensor is skewed or engine thermostat does not operate properly. An intermittent may be caused by a poor connection, rubbed through wire insulation or a broken wire inside insulation. Inspect PCM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, and damaged harness. If connections and harness are okay, observe scan tool while wiggling related connectors and wiring harnesses. A change in display will indicate location of fault.

If DTC cannot be duplicated, the information included in the FAILURE RECORDS data can be useful in determining vehicle mileage since DTC was last set.

If it is determined that DTC is intermittent, performing diagnostics for DTC P1114 or P1115 may isolate cause of fault.