Code result
P01A9
Alternative Fuel Rail/System Pressure - Too High
High severity
What it means
Alt fuel rail or system pressure above the expected operating range.
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
Regulator stuck closed
highOne of the most commonly reported causes for this code — check this first.
Related help
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