What it means
The control circuit of camshaft profile actuator B on the intake side of bank 1 reports a control stuck on 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 controls the alternate intake cam profile on bank 1. The control module checks whether the mechanism releases from the high-lift profile when commanded; this code sets when it appears to remain stuck on, so bank 1 intake operation may not return to the expected profile.
Common causes
Most likely first.
- Actuator stuck in high-lift position
- Release pressure path blocked
- 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 check live commanded and reported profile states to confirm whether bank 1 intake profile B remains on after a release command.
- Check engine oil level and condition because oil pressure or a restricted release path can keep the high-lift mechanism engaged.
- Inspect the bank 1 intake actuator connector, wiring, and accessible release oil passages for damage, contamination, or blockage.
- Test the actuator control circuit and release command using the vehicle's service information.
- If the circuit and oil supply pass, inspect the bank 1 intake profile mechanism for carbon, debris, or binding that prevents release.
Common fixes
- Correct unsuitable oil or an oil supply problem that prevents the bank 1 actuator from releasing.
- Repair damaged wiring or poor connections at the bank 1 intake profile actuator.
- Clean a blocked release passage or contaminated mechanism where the service procedure permits.
- Replace a sticking bank 1 intake profile actuator or mechanism that will not release.
Can I keep driving?
Avoid high engine load and extended driving because the bank 1 intake profile may remain in high lift, causing poor running, reduced power, or stalling. Stop if the engine becomes unstable or stalls, and arrange repair before demanding use.
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.