Code Definition

P04BB — Fuel Fill Door Lock Control Circuit/Open

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Jaguar

About P04BB

P04BB is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Jaguar vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P04BB is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P04BB is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The body control module (BCM) commands the fuel fill door lock actuator to lock or unlock the fuel flap, typically as part of the central locking strategy so the flap secures with the doors and releases when the vehicle is unlocked. The actuator is a small electric motor or solenoid driven by the BCM, and on many vehicles a feedback or position signal confirms the flap has reached the commanded state. DTC P04BB is set when the BCM detects an open circuit, high resistance, or implausible voltage in the actuator control or feedback circuit, preventing it from achieving or verifying the commanded...

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