P208A — Reductant Pump A Control Circuit/Open

P208A: Reductant Pump A Control Circuit/Open — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Reductant Pump A Control Circuit/Open. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • An engine or emissions-system warning, sometimes mentioning DEF, may appear.
  • Depending on the vehicle, a persistent fault may eventually limit engine performance.

Possible causes

  • The DEF/reductant pump control circuit may be open; this is an electrical-circuit indication, not proof that the pump is mechanically seized.
  • Damaged or disconnected wiring, corroded plugs or a pump electrical failure are possible.
  • A control-module problem is considered only after basic circuit checks.

What to check

  • Confirm P208A and other SCR faults, then inspect the pump plug and harness for moisture, damage or corrosion.
  • Test power, ground and circuit continuity using the vehicle wiring information.
  • If the circuit passes, command the pump with a suitable diagnostic tool before replacing parts.

Also written as: P208A-00, P208A00 (some scan tools add the fault-type byte, e.g. -00).