Code result
P2B51
B Camshaft Profile Actuator B Control Performance/Stuck Off Bank 1
High severity
What it means
The control circuit of camshaft profile actuator B on the exhaust side of bank 1 reports a control performance/stuck off condition. Cam profile B (high-lift or VTEC-style) 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
Actuator stuck in low-lift position
highOne of the most commonly reported causes for this code — check this first.
Oil pressure to actuator insufficient
mediumA plausible cause — test and verify before replacing parts.
Carbon or debris buildup preventing free movement
lowLess common, but worth ruling out after the more likely causes.
Related help
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