OBD-II code · Powertrain (generic)
P0004 Fuel Volume Regulator A Control Circuit High
The ECU sees the control voltage of fuel volume regulator A above the expected range, typically a short to power or open ground return.
Is it safe to drive with P0004?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWiring shorted to battery voltage
- PossibleOpen ground return path
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Volume Regulator, Fvr Wiring
Related codes
- P2373Fuel Volume Regulator B Control Circuit High
- P0001Fuel Volume Regulator A Control Circuit/Open
- P0002Fuel Volume Regulator A Control Circuit Range/Performance
- P0003Fuel Volume Regulator A Control Circuit Low
- P0005Fuel Shutoff Valve A Control Circuit/Open
- P0006Fuel Shutoff Valve A Control Circuit Low
- P0007Fuel Shutoff Valve A Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.