C0402
Traction Control Lamp Circuit
The TCS indicator lamp control circuit is shorted or open.
The TCS indicator lamp control circuit is shorted or open.
Common causes
- medium
Indicator bulb/LED failed
A plausible cause — test and verify before replacing parts.
Typical part cost: $40-390
- medium
Wiring shorted
A plausible cause — test and verify before replacing parts.
Typical part cost: $40-390
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does C0402 mean?
C0402 means "Traction Control Lamp Circuit". It is a generic OBD-II code that points to a fault in the chassis.
What are the most common causes of C0402?
indicator bulb/led failed; wiring shorted — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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