What causes C1278 on a Toyota?

Faulty rear speed sensor Damaged sensor rotor Open or shorted sensor harness Poor electrical connection at the sensor Faulty skid control ECU

How do I fix C1278 on a Toyota?

Confirm the code with a scan tool Inspect the wheel speed sensor and its connector Check the sensor tip and rotor for debris or damage Test the sensor circuit for opens and shorts Replace the sensor only after the circuit tests fail Clear the code and retest

C1278 The left rear wheel speed sensor signal changes abnormally as the wheel turns

Q: What does C1278 mean on a Toyota?

C1278. The left rear wheel speed sensor signal changes abnormally as the wheel turns. ABS and stability control are disabled and the ABS warning light comes on.. Applies to Toyota, Lexus and Scion models that use this code.

Category: Chassis
Severity: ABS Light
Applies to: Toyota, Lexus and Scion models that use this code

What does C1278 mean on a Toyota?

C1278. The left rear wheel speed sensor signal changes abnormally as the wheel turns. ABS and stability control are disabled and the ABS warning light comes on.. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.

Common causes of C1278

Faulty rear speed sensor
Damaged sensor rotor
Open or shorted sensor harness
Poor electrical connection at the sensor
Faulty skid control ECU

How to fix C1278

Confirm the code with a scan tool
Inspect the wheel speed sensor and its connector
Check the sensor tip and rotor for debris or damage
Test the sensor circuit for opens and shorts
Replace the sensor only after the circuit tests fail
Clear the code and retest