Code result
P2BFF
Exhaust Flow Control Valve B Position Circuit High
High severity
What it means
The exhaust flow control valve B reports a position circuit high condition. Exhaust routing for back-pressure or noise control cannot be commanded reliably.
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
Signal wire shorted to B+
highOne of the most commonly reported causes for this code — check this first.
Open position sensor
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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