Toyota Fault Code

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C1200

ABS Warning Light / 4WD Interrupted

System

Braking / ABS

Symptom

ABS Warning Light / 4WD Interrupted

Diagnosis & fix steps

LOGIC: Front Left Wheel Speed Sensor Open/Short Circuit. ACTION: Measure AC voltage or digital frequency at the wheel sensor plug while rotating the hub assembly. Inspect wiring harness links for breaks near suspension pivots.

Red Seal field insights

Stability Control: The skid control ECU drops stability controls, hill-start assist, and active 4WD traction loops if a single wheel speed link drops out.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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