OBD Guide
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P1931

Fuel Additive Pump Control Circuit/Open

P1931 is an OBD-II diagnostic trouble code meaning: Fuel Additive Pump Control Circuit/Open. Common causes: open or short circuit in the pump control circuit, additive pump relay malfunction. Estimated repair cost: $28–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$28–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Reduced engine power
  • Increased fuel consumption
  • Increased level of harmful emissions
  • Possible problems starting the engine

Causes

  • Open or short circuit in the pump control circuit
  • Additive pump relay malfunction
  • Wiring harness damage
  • Failure of the pump itself
  • Problems with the engine control unit

How to Fix

  1. Check the integrity of the pump control circuit
  2. Check the functionality of the pump relay
  3. Inspect the wiring harness for damage
  4. Check resistance and power supply of the pump
  5. Replace the fuel additive pump if necessary.

Related codes

P1932P1930P1929

FAQ

What does the P1931 code mean?

P1931 is an OBD-II diagnostic trouble code that indicates: Fuel Additive Pump Control Circuit/Open

What causes a P1931 error code?

The most common causes of P1931 include: Open or short circuit in the pump control circuit; Additive pump relay malfunction; Wiring harness damage; Failure of the pump itself.

How do I fix a P1931 diagnostic trouble code?

To fix P1931: Check the integrity of the pump control circuit. Check the functionality of the pump relay. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1931?

Yes, but get it checked soon

How much does it cost to fix P1931?

The estimated repair cost for P1931 is $28–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat