What it means
The control module detects that the Bank 1 B camshaft profile control is not performing as expected or is stuck off. The code does not by itself identify which cam or component is at fault.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 1 B camshaft profile control changes the operating profile of the B camshaft, typically the exhaust camshaft. The control module compares the requested profile change with system feedback; P005A sets when Bank 1 B profile control does not respond as expected or appears stuck off, but the code alone does not identify the failed part.
Common causes
Most likely first.
- Oil control valve stuck
- Carbon or debris buildup preventing free movement
- Component wear with age - mechanical play
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 note engine speed, load, and temperature when the Bank 1 B profile fault occurred; scan for related cam timing or oil-pressure codes.
- Check the engine oil level and condition, since unsuitable or degraded oil can hinder the Bank 1 B profile-control mechanism.
- Inspect the Bank 1 B oil control valve connector and wiring, and look for leaks, sludge, or debris around the valve and its oil passages.
- Use a scan tool to command the Bank 1 B profile control, where supported, and compare the requested change with camshaft or profile feedback.
- If the valve and oil supply appear sound, follow the manufacturer's tests for the Bank 1 B locking or profile mechanism and check for mechanical wear.
Common fixes
- Correct low oil level or replace oil that does not meet the manufacturer's requirements.
- Repair a loose or damaged Bank 1 B oil-control-valve connector or wiring.
- Clean or replace a sticking Bank 1 B oil control valve if testing confirms it is the cause.
- Repair or replace a worn or debris-restricted Bank 1 B camshaft profile-control mechanism.
Can I keep driving?
Limit hard acceleration if power is reduced, and stop driving if the engine stalls, runs severely rough, or develops an oil-pressure warning. Continued operation with profile control stuck off can worsen drivability and fuel 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.