P1259 – Fuel Additive Pump Circuit
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Symptoms
- Additive warning
- DPF issues
- Check engine light
- Emissions failure
- Possible power loss
Causes
- Open circuit
- Short circuit
- Faulty pump
- Connector corrosion
- Control module fault
Diagnosis
- Check wiring continuity
- Measure pump resistance
- Check power and ground
- Inspect connectors
- Scan live data
Repair
- Repair wiring
- Replace additive pump
- Clean connectors
- Replace control module if needed
- Clear codes and retest