What it means
The control circuit of camshaft profile actuator B on the intake side of bank 1 reports a control performance/stuck off condition. Cam profile B (high-lift or VTEC-style) cannot be commanded reliably.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
Profile actuator B switches the intake cam system on bank 1 to its alternate, typically higher-lift, operating profile. The control module checks whether the actuator responds when that profile is requested; this code means the system behaves as if it remains in the off or low-lift state.
Common causes
Most likely first.
- Actuator stuck in low-lift position
- Oil pressure to actuator insufficient
- Carbon or debris buildup preventing free movement
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
How to diagnose it
- Record freeze-frame data and use live data to see whether the module commanded profile B on bank 1 and whether the reported state changed.
- Check engine oil level and condition because the bank 1 intake profile actuator may depend on adequate oil pressure to move.
- Inspect the bank 1 intake profile actuator, its connector, and associated oil passages for wiring damage, leakage, or signs of contamination.
- Use the vehicle's service information to test the actuator control circuit and confirm the actuator receives the commanded signal.
- If electrical control and oil supply are adequate, inspect the bank 1 intake profile mechanism for carbon, debris, or binding that prevents movement.
Common fixes
- Correct low or unsuitable engine oil and address any oil supply restriction affecting the actuator.
- Repair a loose connector or damaged wiring at the bank 1 intake profile actuator.
- Clean deposits or debris from the actuator mechanism if service information permits.
- Replace a sticking or failed bank 1 intake profile actuator.
Can I keep driving?
The engine may have reduced mid-range power and higher fuel use while bank 1 remains on its low-lift profile. Avoid hard acceleration and overtaking that requires full power; stop if it stalls or runs severely rough.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.