C0136
Stop Lamp Switch Circuit
The ABS or stability control module sees an implausible brake light switch signal. Stability and brake assist functions can be limited until the fault is cleared.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Brake light switch failedCommon
- Switch misadjusted on pedal bracketPossible
Parts involved
- Brake Light Switch
- ABS Control Module
- Wiring
C0136 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.