What does P1221 mean on a Ford?

P1221. Traction Control System Malfunction. Applies to Explorer, Expedition, Mustang with traction control.

What causes P1221 on a Ford?

Failed wheel speed sensor shared with ABS Faulty traction control switch ABS module fault disabling traction Steering angle sensor fault Low system voltage during the self-check

How do I fix P1221 on a Ford?

Scan the ABS module for companion codes first Test wheel speed signals on a roll test Check the traction switch operation Verify charging voltage Repair the ABS fault. Traction usually returns with it

Code

P1221

Traction Control System Malfunction

Category: Chassis
Severity: Check Engine Light
Applies to: Explorer, Expedition, Mustang with traction control
Related: No single generic twin. See OBD Codes List

Findings, check these first

Failed wheel speed sensor shared with ABS
Faulty traction control switch
ABS module fault disabling traction
Steering angle sensor fault
Low system voltage during the self-check

Standard procedure

Scan the ABS module for companion codes first
Test wheel speed signals on a roll test
Check the traction switch operation
Verify charging voltage
Repair the ABS fault. Traction usually returns with it

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: qualified. Read the source limits below.

OBDII.pro: P1221 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1221: Traction Control System Malfunction
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

Last updated 2026-09-20.

Report a correction for P1221. Include your vehicle, the issue and a source if you have one.

This fault is part of the Ford ABS and traction control codes guide. It covers the family and the order to check it.