OBD-II code · Network
U0256 Lost Communication With Front Controls Interface Module A
The vehicle bus reports loss of communication with the front controls interface module A. Hard-keys, rotary knob and steering-wheel switches that route through this module stop being recognised.
Is it safe to drive with U0256?
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
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Front Controls Interface Module A, Vehicle Bus Wiring
Related codes
- U025DLost Communication With Front Controls Interface Module B
- U0253Lost Communication With Accessory Protocol Interface Module
- U0254Lost Communication With Remote Start Module
- U0255Lost Communication With Front Display Interface Module
- U0257Lost Communication With Front Controls/Display Interface Module
- U0258Lost Communication With Radio Transceiver
- U0259Lost Communication With Special Purpose Vehicle Control Module A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.