What it means
The control module detects a low signal in the camshaft B position signal output circuit for bank 2. This indicates an electrical signal fault; the code alone does not identify its cause.
At a glance
- Usually lights the check-engine light
How it works
The camshaft B position signal output circuit for bank 2 carries timing information to the control module. The module detects a signal lower than expected and sets P23F0; a short to ground or a poor connection may cause the low reading, but the code alone does not identify the faulty part.
Common causes
Most likely first.
- Signal circuit shorted to ground
- Open or high-resistance wiring or connection
- Fault in the camshaft position signal source
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 compare bank 2 camshaft B position live data with the other available camshaft signals to identify when the low signal occurs.
- Inspect the bank 2 camshaft B signal wire and connector for chafing to ground, moisture, corrosion, loose terminals, or a pushed-back pin.
- Use the manufacturer's wiring diagram to check the signal circuit for an unintended short to ground and excessive resistance at its connections.
- Check the signal source and its connector while monitoring the circuit, since a source fault can also pull the output low.
- If the wiring and signal source pass their checks, test the module connection and input according to the manufacturer's procedure.
Common fixes
- Clean and secure a loose or corroded bank 2 camshaft B signal connection.
- Repair signal wiring shorted to ground or a high-resistance connection.
- Replace a damaged connector terminal that is pulling the signal low.
- Replace the confirmed faulty signal source or module only after circuit testing.
Can I keep driving?
If the engine remains smooth, drive only as needed and avoid hard acceleration because incorrect bank 2 camshaft B timing information can reduce power or cause stalling. Stop if the engine runs roughly or 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.