Ford Codes List

Ford-enhanced trouble code lookup
for Ford, Lincoln and Mercury.

Repair Order

655 Ford-enhanced codes on file

Code
P1934

Fuel Additive Pump Control Circuit High (Diesel)

Category
Powertrain - Fuel/Air Metering
Severity
Check Engine Light
Applies to
Ford diesel models with additive systems
Related
No single generic twin. See OBD Codes List

Findings, check these first

  • Pump circuit shorted to power
  • Failed pump
  • Stuck driver holding high
  • Wiring fault
  • Module fault

Standard procedure

  1. Test for shorts to power
  2. Check driver command state
  3. Inspect wiring
  4. Isolate the pump
  5. Repair or replace per tests

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: checked against the recorded source material.

  • OBDII.pro: P1934 Ford definition

    live reference page (obdii.pro)

    Supports: Ford-family meaning for P1934: VEHICLE SPEED SIGNAL

    Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

  • P1934 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes

    live reference page (obd2-codes.co)

    Supports: Ford meaning for P1934: Fuel Additive Pump Control Circuit High

    Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.

Last updated 2026-09-06.

Report a correction for P1934. Include your vehicle, the issue and a source if you have one.

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