Code result
P2A3F
Excessive Time to Enter Alternative Fuel Control
Moderate severity
What it means
On bi-fuel vehicles, the AFCM cannot transition into alternative fuel control mode within the calibrated time window. Tank pressure low, vaporizer cold, or fuel quality limits the change-over.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Alt fuel tank pressure low
highOne of the most commonly reported causes for this code — check this first.
Vaporizer not yet at operating temperature
mediumA plausible cause — test and verify before replacing parts.
Related help
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