P0367Camshaft Position Sensor "B" Circuit Low (Bank 1)
The bank 1 "B" camshaft position sensor circuit is stuck at a low voltage, indicating a short to ground or a dead sensor.
Definition
The PCM monitors the voltage on the bank 1 "B" (typically exhaust) camshaft position sensor signal circuit, which should toggle as the cam reluctor passes the sensor. P0367 sets when that circuit stays below the minimum expected voltage — usually a signal wire shorted to ground, a failed sensor holding the line low, or a missing reference voltage. Depending on the vehicle's default strategy, symptoms range from a MIL only to hard starting, rough running, and disabled VVT on that camshaft.
Common causes
- Signal wire shorted to ground (chafed harness)
- Failed camshaft position sensor with an internally shorted output
- Missing 5 V reference or supply voltage to the sensor
- Corroded or contaminated connector shorting adjacent terminals
- PCM input circuit fault (least common)
Common misdiagnoses
- Sensor replaced when the harness is grounding out against the engine
- Timing components replaced for a purely electrical circuit fault
- PCM replaced before the reference voltage circuit is tested
- Wrong sensor ("A" instead of "B") replaced
Troubleshooting steps
1.Back-probe the signal circuit key-on
The signal line should show a bias voltage (commonly 5 V or pulled-up battery voltage); near 0 V confirms the stuck-low condition.
2.Disconnect the sensor and recheck
If the signal voltage returns to normal with the sensor unplugged, the sensor is internally shorted — replace it.
3.Check for a shorted harness
With the sensor and PCM disconnected, verify the signal wire is not continuous to ground; trace chafe points along the valve cover and brackets.
4.Verify sensor supply and ground
Confirm the reference feed (typically 5 V) is present at the connector; a missing feed can also hold the output low.
5.Confirm with a cranking waveform
After repair, scope the signal while cranking to verify a clean square wave before clearing codes.