Encoder Position Switch Circuit
The transfer case control module has detected a circuit fault on the encoder position switch — the contact pack reporting which range the encoder motor has reached. A fault disables 4WD shifting until the switch or wiring is repaired.
Affected components
- Encoder position switch
- Encoder motor
- Transfer case module
Common causes
- High likelihood: Encoder position switch contacts worn
- Medium likelihood: Wiring or connector fault
- Low likelihood: Internal control module fault
Possible symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.