OBD-II code · Network
U02A7 Lost Communication With Engine Sound Control 1
The vehicle bus reports loss of communication with engine sound control unit 1. Active sound design (interior synthetic engine sound or exterior pedestrian alert) for this channel stops.
Is it safe to drive with U02A7?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Engine Sound Module 1, Vehicle Bus Wiring
Related codes
- U02A4Lost Communication With NH3 Sensor
- U02A5Lost Communication With Reductant Heater Control Module
- U02A6Lost Communication With Safety Integration Control Module
- U02A8Lost Communication With Engine Sound Control 2
- U02A9Lost Communication With Charge Air Cooler Coolant Pump A
- U02AALost Communication With Engine Disconnect Clutch
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.