U025C: Lost Communication With Special Purpose Vehicle Control Module D
Standardized SAE J2012 code · U02xx — Lost communication with modules
What does U025C mean?
The vehicle bus reports loss of communication with special-purpose vehicle (SPV) control module D. Upfit functions like emergency lighting, sirens, fleet relays or PTO/auxiliary systems controlled by this node stop responding.
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 Bus wiring open or shorted
- Medium Module without power or ground
- Medium Module failed
Likelihood is a general estimate across vehicles; your make and model may differ.
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U025C in the community
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