P0726 — Engine Speed Input Circuit Range/Performance

P0726: Engine Speed Input Circuit Range/Performance — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Engine Speed Input Circuit Range/Performance. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Difficult starting; uneven idle and jerky acceleration.

Possible causes

  • Faulty engine-speed sensor, damaged wiring or contaminated ring.

What to check

  • Inspect engine-speed signal circuit, connectors and grounds.

Also written as: P0726-00, P072600, PO726 (some scan tools add the fault-type byte, e.g. -00).