OBD Guide
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P1234

Fuel Pump Driver Module Disabled Or Off Line

P1234 is an OBD-II diagnostic trouble code meaning: Fuel Pump Driver Module Disabled Or Off Line. Common causes: malfunction of the fuel pump control module, open or short circuit in control circuit. Estimated repair cost: $33–167.

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

Symptoms

  • Engine won't start
  • Floating engine speed
  • Loss of power when accelerating
  • Stalls at idle
  • Check Engine light comes on

Causes

  • Malfunction of the fuel pump control module
  • Open or short circuit in control circuit
  • Blown fuel pump fuse
  • Fuel pump relay malfunction
  • Wiring Harness Problems

How to Fix

  1. Check the fuel pump fuse
  2. Check fuel pump relay
  3. Inspect the wiring harness for damage
  4. Check the functionality of the fuel pump control module
  5. If necessary, replace the control module

Related codes

P1233P1235P0627

Error P1234 by Vehicle Brand

BuickCadillacChevroletChryslerFordGMGMCLincolnMercuryOldsmobileSaturn

FAQ

What does the P1234 code mean?

P1234 is an OBD-II diagnostic trouble code that indicates: Fuel Pump Driver Module Disabled Or Off Line

What causes a P1234 error code?

The most common causes of P1234 include: Malfunction of the fuel pump control module; Open or short circuit in control circuit; Blown fuel pump fuse; Fuel pump relay malfunction.

How do I fix a P1234 diagnostic trouble code?

To fix P1234: Check the fuel pump fuse. Check fuel pump relay. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1234?

Do not drive — repair immediately

How much does it cost to fix P1234?

The estimated repair cost for P1234 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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