P0257high severityPowertrain
Injection Pump Fuel Metering Control 'B' Low (Cam/Rotor/Injector)
on 2009 Audi A3 2.0L TDI · FWD
What this code means
The PCM detects a low signal in the diesel injection pump fuel metering control circuit 'B'. This can cause incorrect fuel delivery and poor engine performance.
Symptoms
- Engine hard to start
- Reduced power
- Rough running
Common causes
- Faulty injection pump metering control valve
- Wiring or connector fault in circuit B
- Corroded or loose connectors
- Faulty PCM
Diagnostic steps
- Scan and record freeze frame data
- Inspect injection pump wiring and connectors
- Test metering control circuit B for low signal
- Replace faulty component or repair wiring
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