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C0121

Overview

Code

C0121

Code Type

C

Code Class

C0

System

ABS

Severity Level

Medium

Emissions Related

false

Drivability Impact

Minor

Diagnostic Protocol

CAN

Freeze Frame Useful

false

Code Definition

Diagnostic trouble code C0121 indicates a fault in the ABS valve relay circuit

Symptoms

ABS warning light

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

ABS hydraulic control

Possible Causes

Relay failure

Diagnostic Steps

1 Inspect relay 2 Test circuit continuity

Drive Safety Notes

ABS disabled

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