Ford Codes List

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

Repair Order

655 Ford-enhanced codes on file

Code
P1933

Fuel Additive Pump Control Circuit Low (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 ground
  • Failed pump pulling the line low
  • Chafed harness
  • Corroded connector
  • Module fault

Standard procedure

  1. Test for shorts to ground
  2. Isolate the pump
  3. Inspect harness routing
  4. Clean the connector
  5. Repair or replace per findings

Code lookup

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Sources and review

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Last updated 2026-09-06.

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