P1256 — Volkswagen — Coolant-temperature sensor G62: open circuit or short to positive

P1256 concerns the G62 electrical signal and does not by itself establish overheating.

Meaning, symptoms, causes and checks

P1256 concerns the G62 electrical signal and does not by itself establish overheating. Starting and operation during warm-up may be affected.

Affected system: Engine temperature

Symptoms

  • Difficult starting, uneven idle, unusual changes in indicated temperature.

Possible causes

  • Open/shorted wiring or faulty G62 sensor.

What to check

  • Check wiring, connectors and sensor response using vehicle specifications.