Engine

P0368 — Camshaft Position Sensor B Circuit High (Bank 1)

Severity: medium Drive with care, to a shop

What P0368 means

The engine control unit compares the bank 1 camshaft position sensor B signal with the crankshaft signal to know valve timing and when to time fuel and spark. P0368 sets when the voltage in this sensor circuit stays higher than expected. The usual causes are a failed sensor, a short to voltage or a poor connection in the wiring, and only rarely the control unit itself.

Symptoms

  • Check Engine Light on
  • Rough or unstable idle
  • Misfires or hesitation under acceleration
  • Reduced power and sluggish response
  • Worse fuel economy
  • Hard starting or stalling

Possible causes

  1. Failed bank 1 camshaft position sensor B
  2. Damaged wiring harness or corroded, loose connector terminals
  3. Signal wire shorted to voltage
  4. Open or poor ground connection at the sensor
  5. Faulty engine control module (rare)

How to diagnose

  1. Scan all codes and freeze frame data, clear the code and see if it returns
  2. Inspect the sensor, connector and harness for chafing, oil, corrosion and a loose fit
  3. Use a wiring diagram to confirm which sensor is bank 1 sensor B on your engine
  4. Check reference voltage, ground and signal at the sensor connector with a multimeter
  5. With the connector unplugged, test the signal wire for a short to voltage
  6. Compare camshaft and crankshaft signals on a scope or scan tool while cranking
  7. Check the reluctor or target wheel and mechanical cam timing
  8. If the wiring is good, test the ECM with a known-good sensor

Common fixes

  • Replace camshaft position sensor B
  • Repair the wiring and clear the short to voltage
  • Clean or replace the connector and terminals
  • Reflash or replace the ECM if confirmed faulty

Questions and answers

What does P0368 mean?

The ECU detected too high a voltage in the bank 1 camshaft sensor B circuit. The cause is usually the sensor itself or wiring shorted to voltage.

Can I drive with P0368?

Briefly and carefully, until it is repaired. The engine may misfire, lose power or stall, so do not put it off.

Will replacing the sensor fix it?

Not always. Check the wiring and connector first, because a short or bad connection will keep the code coming back with a new sensor.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.