C1235 Right rear wheel speed sensor input missing (Ford)

Ford ABS right rear wheel speed sensor input

C1235 in short

On Ford vehicles, C1235 means the ABS module is not getting a signal from the right rear wheel speed sensor. The ABS light is on and anti-lock may not work. Check the sensor and wiring; Windstar owners often see it with other ABS codes. Have the brakes inspected soon.

Windstar owners quote shop readouts giving C1235 as "RR wheel speed sensor input missing" next to C1236 for the left rear. One owner with a scan tool says the first two codes concern the rear wheel sensors and the third, C1185, the ABS power relay.

NHTSA lists Ford bulletin 17215 for Explorer, Aviator and Mountaineer: amber ABS light on with codes C1235, C1236/C1237. Only the summary was read, so the repair is not stated.

Windstar owners report C1235 alongside C1185 and valve codes, which they or their shops linked to the ABS module itself.

Pick your make

C1235 is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Right rear wheel speed sensor, wiring or tone ring

    Supported by vehicle data
    Why it ranks here
    The code text itself says the input is missing, and Ford bulletin 17215 lists it with the wheel speed sensor codes.
    What would change this
    Rises if the right rear speed reads zero on a scan tool or wiring is damaged. Falls if the signal is normal.

  2. ABS module internal fault

    Possible — needs testing
    Why it ranks here
    Windstar complaints show C1235 together with C1185 and valve codes that owners say point to the ABS module.
    What would change this
    Rises if C1185 and valve codes are stored with it. Falls if only the sensor codes are present.
    How to test the brake system control module (abs module)

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all ABS codes and live wheel speeds and note whether C1236, C1185 or valve codes are also present.

    Low riskTool: scan tool with ABS data

Symptoms

  • Amber ABS light on
  • Traction control light on or traction control engaging on dry roads
  • Brake or ABS warning light on together with the stability control light Gets more serious: stop and have it checked.

How to fix

This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.

Parts and cost context

  • Brake system control module (ABS module):Windstar owners report ABS module repair as the costly outcome; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Ford

  • 1999–2003 · Windstar

    Supported by vehicle data

    Windstar owners quote shop readouts of C1235 as right rear wheel speed sensor input missing, often with C1236 and C1185. Based on owner complaints, not a Ford document.

  • 2002–2004 · Explorer

    Supported by vehicle data

    Ford bulletin 17215 covers an amber ABS light with C1235 and C1236/C1237. Only the NHTSA summary was read; whether it is current is not verified.

  • 17215Status unverified

    Amber ABS light on with DTCs C1235, C1236/C1237

    2002–2004explorer · NHTSA 10004076

    NHTSA lists a Ford bulletin for an amber ABS lamp with C1235, C1236 and C1237 stored. The summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • C1185ABS power relay output circuit failure (Ford)

    Shares causes Supported by vehicle data

    Windstar complaints show C1185 (ABS power relay output) stored with C1235; shops tied both to the ABS module.

All ABS, traction and stability control codes

C1235 questions

Is C1235 the same as C1236?

Owners quote C1236 as the left rear wheel speed sensor input missing and C1235 as the right rear, so they are neighbours that often appear together.

Sources and review

  1. NHTSA complaint ODI 10217805: 2003 Ford Windstar ABS light — NHTSA Office of Defects Investigation
  2. Ford 17215: amber ABS warning light on with DTCs C1235, C1236/C1237 stored in memory (2002-2004 Explorer, 2004 Aviator, 2002-2003 Mountaineer) — NHTSA manufacturer communications (flat file, NHTSA ID 10004076)
  3. NHTSA complaint ODI 10639462: 1999 Ford Windstar ABS lights — NHTSA Office of Defects Investigation
Last reviewed
Written by
Saurabh K.
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