Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

If DTCs P0105, P0110, P0115, and P0120 are also set, malfunction may be a faulty sensor ground circuit.
Check for a faulty electrical connection to PCM.
Check for proper operation of the engine cooling system and verify correct coolant level.
Use the Temperature vs. Resistance table to evaluate possibility of a shifted ECT sensor. A shifted sensor could result in a DTC P0115. See TEMPERATURE VS. RESISTANCE table.

An intermittent malfunction may be caused by a fault in ECT sensor electrical circuit. Check wiring harness and components for an intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 1.8L VIBE article. Repair any electrical circuit faults found.

If DTC P0115 cannot be duplicated, information included in freeze frame data can be useful in determining vehicle operating conditions when DTC first set.