What Does P0003 Mean?
P0003 indicates the fuel volume regulator (FVR) control circuit has a low voltage condition. The ECM has detected that the signal or control voltage on the FVR solenoid circuit is below the expected threshold. This typically means a short to ground in the wiring, a partially shorted solenoid coil, or a driver-side issue in the ECM. The engine may experience low fuel rail pressure, poor performance, hard starting, and potential stalling.
Safety Warning
A low-voltage condition on the FVR circuit means fuel rail pressure may drop well below specification, causing the engine to stall without warning. Do not drive the vehicle until this fault is repaired, especially in traffic or at highway speeds.
Common Causes
35%
Short to ground in the FVR solenoid control wiring due to chafed insulation contacting the engine block or metal bracket
30%
FVR solenoid coil partially shorted internally, drawing excessive current and pulling voltage low
20%
Water intrusion or corrosion in the FVR solenoid connector creating a low-resistance path to ground
15%
ECM internal driver circuit fault outputting insufficient voltage to the FVR solenoid
Diagnostic Steps
1
Disconnect the FVR solenoid and measure circuit voltage at the harness connector with the key on — you should see battery voltage (12-14V) if the ECM driver is commanding the circuit high.
2
With the FVR solenoid disconnected, check for a short to ground on each wire using a multimeter set to ohms — reading should be OL (infinite). Any low resistance indicates a short.
3
Measure the FVR solenoid coil resistance — compare to spec (typically 1-6 ohms). A reading significantly below spec indicates an internal short.
4
Visually trace the FVR wiring harness from the solenoid to the ECM, looking for areas where the insulation may be worn through by contact with engine components.
5
If wiring and solenoid test normal, swap in a known-good ECM or test the ECM driver output with an oscilloscope to verify proper PWM signal.
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
P0003 indicates the fuel volume regulator (FVR) control circuit has a low voltage condition. The ECM has detected that the signal or control voltage on the FVR solenoid circuit is below the expected threshold. This typically means a short to ground in the wiring, a partially shorted solenoid coil, o...
The most common cause of P0003 (Fuel Volume Regulator Control Circuit Low) is: Short to ground in the FVR solenoid control wiring due to chafed insulation contacting the engine block or metal bracket
Typical repair costs for P0003 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A low-voltage condition on the FVR circuit means fuel rail pressure may drop well below specification, causing the engine to stall without warning. Do not drive the vehicle until this fault is repaired, especially in traffic or at highway speeds.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0003 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
