OBD Guide
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P1237

Fuel Pump Secondary Circuit Fault

P1237 is an OBD-II diagnostic trouble code meaning: Fuel Pump Secondary Circuit Fault. Common causes: fuel pump malfunction, problems with the fuel pump relay. Estimated repair cost: $33–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–167 (est.)

Symptoms

  • The engine stalls or does not start
  • Loss of power during acceleration
  • Unstable engine idling
  • Check Engine Light Is On
  • Increased fuel consumption

Causes

  • Fuel pump malfunction
  • Problems with the fuel pump relay
  • Open or short circuit in wiring
  • Engine control unit malfunction
  • Poor contact in the fuel pump connectors

How to Fix

  1. Check the voltage at the fuel pump
  2. Inspect wiring and connectors for damage
  3. Check the operation of the fuel pump relay
  4. Test the fuel pump itself
  5. If necessary, replace the fuel pump or relay

Related codes

P1235P1236P1238

Error P1237 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCJaguarLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1237 code mean?

P1237 is an OBD-II diagnostic trouble code that indicates: Fuel Pump Secondary Circuit Fault

What causes a P1237 error code?

The most common causes of P1237 include: Fuel pump malfunction; Problems with the fuel pump relay; Open or short circuit in wiring; Engine control unit malfunction.

How do I fix a P1237 diagnostic trouble code?

To fix P1237: Check the voltage at the fuel pump. Inspect wiring and connectors for damage. Check the operation of the fuel pump relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1237?

Do not drive — repair immediately

How much does it cost to fix P1237?

The estimated repair cost for P1237 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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