OBD-II code · Network
U025A Lost Communication With Special Purpose Vehicle Control Module B
The vehicle bus reports loss of communication with special-purpose vehicle (SPV) control module B. Upfit functions like emergency lighting, sirens, fleet relays or PTO/auxiliary systems controlled by this node stop responding.
Is it safe to drive with U025A?
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
- 0.5–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Special Purpose Vehicle Module B, Vehicle Bus Wiring
Related codes
- U0259Lost Communication With Special Purpose Vehicle Control Module A
- U025BLost Communication With Special Purpose Vehicle Control Module C
- U025CLost Communication With Special Purpose Vehicle Control Module D
- U0257Lost Communication With Front Controls/Display Interface Module
- U0258Lost Communication With Radio Transceiver
- U025DLost Communication With Front Controls Interface Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.