C0388
Transfer Case High Range Switch Circuit Malfunction
The transfer case control module has detected an implausible state from the high range (4H) position switch. Range selection in 4WD mode may be limited.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
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.
- High range position switch failedCommon
- Shift actuator out of positionPossible
Parts involved
- Transfer Case Switch
- Transfer Case Module
- Shift Actuator
C0388 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.