Camshaft Position Sensor B Circuit Low (Bank 1)
What it means
The engine computer has seen the signal voltage from camshaft position sensor B on bank 1 stay below its normal limit. The most likely cause is a signal wire shorted to ground or a loss of sensor supply, and exhaust cam timing control on this bank is usually disabled.
Related lights
Dashboard lights that may come on with this code.
Symptoms4
- Check engine light on.
- Reduced power because variable valve timing (VVT) is disabled.
- Occasional long cranking.
- Higher fuel consumption.
Possible causes6
- Signal wire shorted to ground through damaged insulation.
- Open or weak supply voltage to the sensor.
- Internal short inside the sensor.
- Corroded or oil-soaked connector.
- A short in another sensor sharing the same reference voltage supply.
- Faulty engine computer (rare).
How to diagnose5
- Read all codes and look for reference voltage codes such as P0641 or low-voltage codes on other sensors such as P0342.
- Unplug the sensor, measure supply voltage at the connector and compare it with the manufacturer specification.
- Measure resistance between the signal wire and the body with connectors unplugged.
- Inspect the harness where it passes near heat or rubbing points.
- If the circuit is sound, try a known-good sensor or swap it with sensor A if identical.
How to fix5
- Repair and insulate the shorted section and secure the harness.
- Clean the connector and fix the source of oil reaching it.
- Repair the reference supply circuit or the other sensor causing the short.
- Replace cam sensor B if it is proven faulty.
- Clear the codes and confirm the code does not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
In the Saudi market: SAR 100–600 (≈ USD 27–160)
Our prices come from the Saudi market, converted at a fixed rate (SAR 3.75 per USD). Prices in your country may differ a lot, so we show the cost level.
The fix is often a simple wire or connector repair, and the cost rises when a new sensor is needed.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
P0342 and P0367 appeared together. What does that mean?
Low voltage on both cam sensors at once points to a shared supply problem or a wire they share, not both sensors failing together.
Does this code affect fuel economy?
Yes, slightly, because the computer disables exhaust cam timing control and the engine runs on less efficient settings.
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