What does code U02BB mean?

Q: What does code U02BB mean?

Lost Communication With EVAP System Purge Pump. U02BB is a generic communication fault indicating that a control module on the vehicle's network has lost contact with the evaporative emissions (EVAP) system purge pump, which is a small electric pump used on some systems to pressurize the fuel tank for leak testing. The computer sets this code when it expects periodic status messages from the purge pump module but does not receive them within the required time window.

DTC codes / U02xx · Lost communication with a control module / U02BB

U02BBLost Communication With EVAP System Purge Pump

U02BB is a generic communication fault indicating that a control module on the vehicle's network has lost contact with the evaporative emissions (EVAP) system purge pump, which is a small electric pump used on some systems to pressurize the fuel tank for leak testing. The computer sets this code when it expects periodic status messages from the purge pump module but does not receive them within the required time window.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaLost communication with a control module

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.