Error code

OBD2 P0392

OBD2P0392
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Camshaft Position Sensor 'B' Circuit Low.

Severity

moderateCan drive, but performance will be affected.

Summary

P0392 indicates a low input signal issue with the camshaft position sensor B on bank 2 of your vehicle's engine.

Symptoms

  • Hesitation upon acceleration
  • General lack of engine performance
  • Diminished fuel efficiency
  • Overheated catalytic converter due to timing issues
  • Spark detonation (backfire) when decelerating
  • Spark knock (pinging) when accelerating

Common Causes

  • Defective camshaft sensor or crankshaft sensor
  • Open or shorted wiring to the camshaft sensor
  • Corroded or fluid-soaked connector/camshaft sensor
  • Faulty PCM or PCM programming error

Diagnosis

  1. Perform a visual inspection of all system-related wiring harnesses and connectors.
  2. Load test the battery, check battery terminal ends and cables, and alternator output.
  3. Use a diagnostic scanner to retrieve stored trouble codes and freeze frame data.
  4. Test voltage and ground signals at the camshaft sensor in question.
  5. Disconnect and test the camshaft sensor using a DVOM.
  6. Reconnect the oscilloscope to observe waveform patterns for unexpected spikes or glitches.

Fixes

  • Replace defective camshaft sensor or crankshaft sensor

FAQ

What does P0392 mean?

P0392 indicates a low input signal issue with the camshaft position sensor B on bank 2 of your vehicle's engine.

How do I diagnose P0392?

Diagnose by checking wiring, connectors, and sensors for issues such as corrosion or fluid damage. Use a diagnostic scanner to retrieve codes and test signals with a DVOM and oscilloscope.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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