P20A1 — Reductant Purge Control Valve A Performance

P20A1: Reductant Purge Control Valve A Performance — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Reductant Purge Control Valve A Performance. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Warning light may illuminate
  • Related system function may be impaired
  • Vehicle-specific symptoms vary

Possible causes

  • Exhaust or emissions plumbing leak, restriction, valve fault, sensor fault, or damaged wiring
  • Related wiring, connector, power or ground fault
  • Vehicle-specific mechanical or control issue

What to check

  • Record stored and pending codes and freeze-frame data
  • Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.
  • Confirm measured values against the vehicle service information
  • Retest under the conditions that set the code
  • Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.
  • Repair the verified cause and confirm the code does not return

Also written as: P20A1-00, P20A100 (some scan tools add the fault-type byte, e.g. -00).