C1236 on Ford

Left rear wheel speed sensor input missing (Ford)

Severity: Inspect soon

The ABS lamp is on and ABS is off, and on Windstars the code appears with a failing ABS module and a brake warning light.

It gets more serious if:

Stop: Stop and have the vehicle inspected if a red BRAKE warning light comes on or the brake pedal feels different.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

This page covers only what differs on Ford. For what C1236 means, the ranked causes and the test order, see the C1236 guide.

What's different on Ford

Ford

2005 · Freestar
Supported by vehicle data
Ford bulletin 052510 ties C1175/C1236 to the rear wheel speed sensor.

052510Status unverified
ABS light with C1175/C1236 and C1165/C1235
2005freestar · issued February 1, 2006 · NHTSA 10019009
Rear wheel speed sensor fault pair; summary only.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Sources and review

Ford 052510: ABS LIGHT ON AND DTCS C1175/C1236, C1165/C1235 - REAR WHEEL SPEED SENSOR. *TT — NHTSA manufacturer communications (flat file, NHTSA ID 10019009)
NHTSA complaint ODI 10217805: 2003 Ford Windstar, C1236 LR wheel speed sensor input missing — NHTSA Office of Defects Investigation
NHTSA complaint ODI 10274301: 2002 Ford Windstar ABS codes — NHTSA Office of Defects Investigation

Last reviewed: October 16, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error