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P codepowertrainMedium severity

P0365Camshaft Position Sensor "B" Circuit (Bank 1)

The PCM has lost or never received a valid signal from the bank 1 "B" camshaft position sensor, typically the exhaust cam sensor.

Definition

On engines with dual overhead cams, sensor "B" reports the position of the second camshaft on bank 1 — usually the exhaust cam — which the PCM uses for variable valve timing control and cylinder identification. P0365 sets when no signal or an implausible signal is present on the sensor circuit while the engine is cranking or running. Symptoms range from a MIL with no driveability complaint to hard starting, rough idle, reduced power, and disabled VVT on that camshaft, and some vehicles may fail an emissions test with the code present.

Common causes

  • Failed camshaft position sensor
  • Damaged sensor connector or wiring (open, short, or corroded terminals)
  • Sensor contaminated with metal debris or sludge from degraded oil
  • Damaged or misaligned cam sensor reluctor/tone ring
  • Stretched timing chain or jumped timing altering cam position
  • Loss of sensor reference voltage or ground from the PCM

Common misdiagnoses

  • Sensor "A" replaced instead of the correct "B" (exhaust cam) sensor
  • Camshaft position sensor replaced when the wiring harness is at fault
  • VVT solenoid replaced for what is a sensor circuit fault
  • Timing chain replaced without verifying the sensor and circuit first

Troubleshooting steps

  1. 1.Identify the correct sensor

    Confirm from service data which sensor is "B" on bank 1 — usually the exhaust cam sensor on the side containing cylinder 1.

  2. 2.Inspect the connector and wiring

    Check for oil-soaked or corroded terminals, chafed insulation, and proper connector lock engagement.

  3. 3.Verify sensor power and ground

    Most modern cam sensors are 3-wire Hall-effect: confirm 5 V (or battery voltage per spec) reference and a good ground at the connector, key on.

  4. 4.Scope the signal wire while cranking

    A healthy Hall sensor produces a clean square wave; a flatline with good power and ground condemns the sensor.

  5. 5.Inspect the reluctor and cam timing

    With the sensor removed, check the tone ring for damage or debris, and compare cam/crank correlation PIDs for evidence of a stretched chain.

  6. 6.Clear and verify

    After repair, confirm the code does not reset through several cold starts, since these faults often appear at start-up.

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