P0218 — Transmission Fluid Temperature Sensor A Over Temperature Condition

P0218: Transmission Fluid Temperature Sensor A Over Temperature Condition — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Transmission Fluid Temperature Sensor A Over Temperature Condition. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • A transmission-temperature warning, abnormal gear changes or reduced-performance mode may occur.

Possible causes

  • Transmission fluid condition or level, cooling restrictions and heavy loading can contribute to excessive heat.

What to check

  • Let the transmission cool; check for leaks and cooling restrictions, then verify fluid and temperature using vehicle-specific procedures.

Also written as: P0218-00, P021800, PO218 (some scan tools add the fault-type byte, e.g. -00).