What causes fault code P0392?

• Most likely: Faulty Camshaft Position Sensor (internal short) • Likely: Wiring harness damaged or shorted to ground in the signal circuit • Possible: Connector corrosion causing high resistance or poor connection • Rare: Improper camshaft timing or faulty PCM/ECM

How do you fix fault code P0392?

STEP 1: Inspect the connector at Camshaft Sensor B (Bank 2) for oil intrusion or corrosion. Clean as necessary. STEP 2: Use a multimeter to verify reference voltage (typically 5V or 12V) with ignition ON. Also, verify a solid ground (should be < 0.5 Ohm). STEP 3: Perform an oscilloscope test on the signal wire while cranking/running. A clean square wave pattern should be visible. STEP 4: If power and ground are present but no signal is produced, replace the camshaft position sensor. Clear codes and perform a drive cycle.

Powertrain (Engine & Gearbox)Standard EOBD

P0392 - Camshaft Position Sensor B Circuit Low (Bank 2)

Q: What does fault code P0392 mean?

P0392 is an OBD-II diagnostic trouble code (DTC) indicating that the Engine Control Module (ECM) has detected a low voltage signal from the exhaust camshaft position sensor (Sensor B) on Bank 2. This sensor is critical for the ECM to determine the exact position of the camshaft relative to the crankshaft. A 'Circuit Low' condition typically indicates a short to ground in the signal wire, a faulty sensor pulling the voltage down, or a loss of reference voltage. This affects ignition timing and fuel injection synchronization.

Q: What are the symptoms of fault code P0392?

• Check engine light (MIL) illumination • Hard starting or long cranking times • Engine hesitation or surging • Engine stalling at idle • Decreased fuel economy and reduced power

Last updated:1 February 2026

Related:Camshaft Position Sensor, Wiring Harness, Engine Control Unit (ECU/PCM), Crankshaft Position Sensor

System

Powertrain (Engine & Gearbox)

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Technical Description

P0392 is an OBD-II diagnostic trouble code (DTC) indicating that the Engine Control Module (ECM) has detected a low voltage signal from the exhaust camshaft position sensor (Sensor B) on Bank 2. This sensor is critical for the ECM to determine the exact position of the camshaft relative to the crankshaft. A 'Circuit Low' condition typically indicates a short to ground in the signal wire, a faulty sensor pulling the voltage down, or a loss of reference voltage. This affects ignition timing and fuel injection synchronization.

Possible Causes

Faulty Camshaft Position Sensor (internal short)

Wiring harness damaged or shorted to ground in the signal circuit

Connector corrosion causing high resistance or poor connection

Improper camshaft timing or faulty PCM/ECM

Symptoms

Check engine light (MIL) illumination

Hard starting or long cranking times

Engine hesitation or surging

Engine stalling at idle

Decreased fuel economy and reduced power

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P0392 - Camshaft Position Sensor B Circuit Low (Bank 2)

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P0392 - Camshaft Position Sensor B Circuit Low (Bank 2)

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