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DTC code

C1254

ABS Inlet Valve Coil RR Circuit Failure

Technical guide

Symptoms

  • ABS warning light illuminated
  • potential loss of ABS functionality
  • possible stability/traction control warning
  • compromised control during hard braking.

Probable causes

  • Electrical fault in the right rear ISO valve circuit
  • damaged wiring or connectors
  • failed ISO valve
  • fault in the ABS module.

Diagnostic steps

  1. Scan the ABS module, record codes, clear, and retest to confirm C1254 is current.
  2. Inspect the right rear ISO valve circuit wiring and connectors for damage and corrosion.
  3. Test the ISO valve solenoid electrically per service manual values.
  4. Repair wiring or replace the failed ISO valve/hydraulic unit as found.
  5. If the circuit and valve are good, evaluate the ABS control module.
  6. Clear codes and road-test to verify ABS operation.

Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.

Models most reported with this code (NHTSA)

Ford Windstar 30

Count of distinct owner complaints mentioning the code. US data — same engines, same failures.

AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.

0 confirmed cases on C1254

Nothing confirmed yet for this code. No guess is offered on purpose.

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