Exhaust Aftertreatment Fuel Pressure Sensor Circuit Low
This code means the PCM/ECM has detected a low-voltage circuit condition affecting exhaust aftertreatment fuel pressure sensor. The problem is usually tied to fuel pressure control, injector operation, or the electrical circuit that commands the component. Depending on the failure, the engine may start hard, idle rough, hesitate, or lose power.
What You Might Notice
- Check Engine Light illuminated
- Hard starting or extended cranking
- Rough idle or misfire
- Reduced power under load
- Poor fuel economy
Most Common Causes
- 1
Short to ground or excessive resistance in the circuit
- 2
Open, shorted, or corroded wiring/connectors
- 3
Restricted fuel filter or weak fuel supply
- 4
Vacuum leak or unmetered air entering the engine
- 5
PCM command/driver fault
How to Diagnose It
- 1
Check Short to ground or excessive resistance in the circuit — Inspect for signs of failure and test before replacing.
- 2
Check Open, shorted, or corroded wiring/connectors — Inspect for signs of failure and test before replacing.
- 3
Check Restricted fuel filter or weak fuel supply — Inspect for signs of failure and test before replacing.
- 4
Check Vacuum leak or unmetered air entering the engine — Inspect for signs of failure and test before replacing.
- 5
Check PCM command/driver fault — Inspect for signs of failure and test before replacing.
How to Fix It
- 1
Check live data and fuel pressure against specifications
- 2
Inspect and repair wiring/connectors in the affected circuit
- 3
Test and replace the faulty injector, regulator, pump, or sensor
- 4
Repair vacuum leaks or fuel supply restrictions
- 5
Clear the code and confirm the repair with a road test
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