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P0368 — Camshaft Position Sensor B Circuit High Bank 1

Generic OBD-II · all makesPowertrain (engine & transmission)

The P0368 code indicates that the engine control module has detected an abnormally high voltage signal from the Bank 1 Camshaft Position (CMP) Sensor B. This sensor is critical for monitoring the position of the camshaft to optimize ignition timing and fuel injection.

Symptoms

What causes it — most likely first

1. Failed Camshaft Position Sensor

Internal electrical failure within the sensor B on bank 1, causing it to send an out-of-range high voltage signal.

2. Wiring Harness Damage

Frayed, broken, or shorted wiring between the sensor and the PCM, often caused by heat or abrasion.

3. Connector Corrosion

Corroded or loose pins at the sensor connector, leading to an open circuit or poor electrical contact.

4. Mechanical Timing Issues

A stretched timing chain or jumped gear that puts the camshaft in an unexpected position relative to the crankshaft.

5. PCM Fault

An internal failure of the engine control module's processing circuit for the CMP B input.

How it's diagnosed

  1. Perform a visual inspection of the sensor connector and wiring for obvious damage or corrosion.
  2. Clear the code and check if it returns immediately upon startup to confirm a persistent electrical fault.
  3. Use a multimeter to verify that the sensor is receiving the correct reference voltage from the PCM.
  4. Test the signal wire for continuity and check for shorts to ground or power.
  5. Use an oscilloscope to verify the waveform of the sensor signal during engine cranking or idling.
  6. Verify mechanical timing using a timing kit to ensure the camshaft is properly aligned.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationSAE generic — identical on every make
Related codesP0360 — Ignition Coil J Primary Control CircuiP0361 — Ignition Coil K Primary Control CircuiP0362 — Ignition Coil L Primary Control CircuiP0363 — Misfire Detected Fueling DisabledP0364 — Dcac Converter Control Module Control P0365 — Camshaft Position Sensor B Circuit Ban

Frequently asked

Can this code cause the car to stall?

Yes, if the PCM loses a reliable camshaft signal, it may struggle to maintain synchronization, leading to erratic idling or stalling.

Does 'Circuit High' mean the sensor is working too hard?

No, 'Circuit High' refers to the electrical voltage level being higher than the PCM's expected range, usually indicating an open circuit or internal sensor failure.

Should I replace the PCM if I have this code?

No; it is highly uncommon for the PCM to be the cause of P0368. The failure is almost always located in the sensor itself or the associated wiring.