Code result
P0004
Fuel Volume Regulator Control Circuit High
High severity
What it means
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?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Wiring shorted to battery voltage
highOne of the most commonly reported causes for this code — check this first.
Open ground return path
mediumA plausible cause — test and verify before replacing parts.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Related help
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