Camshaft Position Sensor 'B' Circuit Low Voltage (Bank 1)
This code indicates low voltage at the camshaft position sensor 'B' on the bank 1 side.
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What it means (plain English)
The camshaft position sensor 'B' measures where the camshaft is positioned. If it reports low voltage, the engine control module (ECM) can't accurately track the cam position, which affects timing and performance.
What the computer is actually seeing
The ECM expects a voltage signal from the camshaft position sensor around 0.5 to 4.5 volts. A reading below 0.5 volts indicates a problem with the sensor or its circuit.
What a healthy reading looks like
Expected voltage range from the sensor is typically 0.5V to 4.5V depending on the camshaft position.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors at the camshaft position sensor 'B' for any visible damage or corrosion. Repair as necessary. Decision: Is wiring intact? (Yes: proceed to step 2; No: repair wiring first)
- 22. Using a multimeter, measure the voltage at the camshaft position sensor connector with the key on/engine off. Voltage should be within expected range (0.5V-4.5V). Decision: Is the voltage within range? (Yes: proceed to step 3; No: replace sensor or repair wiring)
- 33. With the engine running, back-probe the camshaft position sensor to check for voltage fluctuations while monitoring engine RPM. Decision: Is there a fluctuating signal? (Yes: replace the sensor; No: investigate ECM issues)
Common causes
- Faulty camshaft position sensor 'B'
- Damaged wiring or connectors
- Poor electrical connection
- Timing chain/belt issues causing misalignment
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix it soon; drivability may be affected, especially if performance is poor.
Will the code come back after clearing?
If the underlying issue isn't resolved, yes, it will likely return.
Why does this code pair with other codes?
It may indicate related camshaft or timing issues affecting multiple components.
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