What it means
Low control voltage at the cam profile actuator (intake, profile A, bank 2). Same fault as P001B on bank 2. The cam phaser actuator adjusts intake/exhaust timing under load — a stuck or slow phaser kills mid-rpm torque and can throw correlation codes between cam and crank.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The bank 2 intake camshaft profile A actuator selects a cam-lift mode on engines with selectable lift profiles. The engine control module monitors the actuator control circuit; this code sets when the circuit voltage is lower than expected, such as from a short to ground, a shorted coil, or a poor connection.
Common causes
Most likely first.
- Wiring shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
How to diagnose it
- Save freeze-frame data and check live actuator commands and related codes to establish when the bank 2 profile A circuit reads low.
- Inspect the bank 2 actuator connector for corrosion or loose terminals and examine the harness for insulation worn through against the engine or nearby parts.
- Check the control wire for a short to ground using the manufacturer's circuit test procedure.
- Measure the actuator coil and connector condition against the manufacturer's specification to check for an internal short or high-resistance connection.
- If the wiring and actuator pass, test the module control output according to the manufacturer's procedure.
Common fixes
- Clean and secure corroded or loose bank 2 actuator connector terminals.
- Repair harness insulation or wiring shorted to ground.
- Replace the bank 2 profile A actuator if its coil is confirmed faulty.
- Repair the module circuit only if testing confirms a module-side fault.
Can I keep driving?
The engine may lose power or run roughly if the bank 2 cam-lift profile cannot be controlled. Keep acceleration gentle if symptoms are present, and stop if the engine stalls.
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.