P2B56 — B Camshaft Profile Actuator B Control Stuck On Bank 2
The control circuit of camshaft profile actuator B on the exhaust side of bank 2 reports a control stuck on condition. Cam profile B (high-lift or VTEC-style) cannot be commanded reliably.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- B camshaft profile actuator b b2
- Wiring harness
- Ecm
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Actuator stuck in high-lift position
- Release pressure path blocked
- Carbon or debris buildup preventing free movement
Possible symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- Reduced-power or limp mode may occur
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.