U0197: Lost Communication With Telephone Control Module
Standardized SAE J2012 code · U01xx — Lost communication with modules
What does U0197 mean?
The infotainment system cannot reach the hands-free phone controller. Bluetooth telephony, address book sync and emergency call features may be unavailable.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
Common causes
- High Hands-free module unpowered
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U0197 on the same make and model first.
U0197 in the community
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