Lost Communication with Hands-Free Phone Control Module
The infotainment system cannot reach the hands-free phone controller. Bluetooth telephony, address book sync and emergency call features may be unavailable.
Affected components
- Hands free module
- Infotainment bus
Common causes
- High likelihood: Hands-free module unpowered
- Low likelihood: Gateway module routing CAN messages incorrectly
- Low likelihood: CAN terminating resistor (120 Ω) drifted out of spec
Possible symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
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.