P0002 – Fuel Volume Regulator Control Circuit Range/Performance

Description

The P0002 code indicates that the fuel volume regulator, responsible for controlling the amount of fuel supplied to the engine, is not operating within the expected range. This could mean that the signal from the regulator to the powertrain control module (PCM) is outside the normal parameters, leading to issues with the engine’s fuel delivery system. This malfunction can cause either too much or too little fuel to be sent to the engine, impacting performance and fuel economy.

Symptoms

- Poor fuel economy
- Hesitation during acceleration
- Rough idle
- Engine stalling or surging
- Check engine light (CEL) illuminated
- Difficulty starting the vehicle
- Reduced engine power or limp mode

Common Causes

- Faulty fuel volume regulator
- Wiring issues such as damaged, frayed, or corroded connections in the fuel volume regulator circuit
- Fuel pressure sensor malfunction
- Contaminated or dirty fuel injectors
- PCM malfunction (rare)
- Fuel system blockage or restriction

Seriousness of the Issue

Moderate to High: If left unresolved, it can lead to poor performance and potentially cause damage to other parts of the engine, such as fuel injectors or the catalytic converter due to incorrect fuel delivery. It may also affect the car’s drivability, particularly during acceleration or under load.

How to Fix

Inspect the fuel volume regulator for any visible damage or signs of wear. Replace if necessary.
Check wiring and connectors for the fuel volume regulator circuit. Repair or replace any damaged or corroded wires.
Test the fuel pressure sensor to ensure it is working properly. Replace if faulty.
Clean or replace fuel injectors if they are dirty or clogged.
Check for fuel system blockages and ensure that the fuel lines are clear and unobstructed.
If all else fails, perform a PCM reset or reprogramming as a last resort if the problem lies with the vehicle’s control module.
If the fuel pressure or volume regulator is faulty, it will likely need to be replaced.