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Home / DTC / P0394 — Camshaft Position Sensor B Circuit Intermittent Bank 2

P0394 — Camshaft Position Sensor B Circuit Intermittent Bank 2

Detailed page for trouble code P0394.

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Code

P0394

Generic P — Powertrain

Camshaft Position Sensor B Circuit Intermittent Bank 2

Brand: Generic
Type: P — Powertrain
Views: UK: 12 EN: 24 RU: 10
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Page language: EN

Causes

  • Damaged, frayed, or chafed wiring in the cam sensor harness (Bank 2)
  • Loose, corroded, or contaminated connector at the camshaft position sensor
  • Faulty camshaft position sensor (Bank 2, sensor B)
  • Poor ground or lost reference voltage to the sensor
  • Intermittent short to power or ground in harness
  • Timing chain/belt or camshaft position/target wheel damage causing irregular signal

Symptoms

  • Check Engine Light (MIL) illuminated intermittently
  • Intermittent rough idle or stalling
  • Hesitation or reduced engine performance during acceleration
  • Hard starting or occasional no-start condition
  • Erratic rpm behavior or misfire-related symptoms
  • Possible stored or pending cam/crank correlation trouble codes

What to check

  • Read freeze-frame and complete DTC list with a scan tool; note conditions when code set
  • Visual inspection of harness and connector at camshaft position sensor B (Bank 2) for corrosion, bent pins, damage, or oil contamination
  • Wiggle test the wiring/connector while monitoring live data or watch for code set
  • Backprobe sensor connector to check reference voltage, ground continuity, and output signal while cranking/running
  • Use a multimeter to check sensor resistance (if applicable) and continuity to PCM
  • Use an oscilloscope to verify waveform shape, amplitude, and stability vs. engine speed

Signal parameters

  • Hall-effect type sensor: 5 V reference present, output is a 0–5 V square wave (logic pulses). Duty cycle typically ~50%; frequency proportional to engine speed.
  • Variable reluctance (VR) type sensor: AC sine or pulse on output. Amplitude varies with rpm — small (~0.1–1.5 VRMS) at idle, increases with engine speed. Signal frequency proportional to cam speed.
  • Expected behavior: clean, repeatable pulse train while cranking and running; missing or noisy pulses indicate an intermittent circuit or sensor problem.
  • If measuring with a DMM: Hall sensor will read switching between near 0 V and near battery/5 V; VR sensor shows AC voltage when cranking/running (no DC switching). Use oscilloscope for definitive waveform checks.

Diagnostic algorithm

  1. Connect a scan tool, record freeze-frame data, read all related codes (cam/crank/misfire). Note operating conditions when P0394 stored.
  2. Visually inspect the Bank 2 cam sensor connector and wiring for damage, oil intrusion, corrosion, or pin deformation. Repair as necessary.
  3. Perform a wiggle/strain test on the harness and connector while monitoring live cam sensor data or watching for code recreation.
  4. Backprobe the sensor connector: confirm 5 V reference (Hall) or reference circuit, good ground, and sensor output while cranking and idling. If no reference/ground, trace to PCM and repair.
  5. If voltages present, use an oscilloscope to verify waveform quality (clean square wave for Hall, consistent AC pulses for VR). Compare to known-good bank if possible.
  6. If waveform is intermittent or missing and wiring checks good, disconnect and measure sensor resistance (if manufacturer spec available). Replace sensor if out of spec or intermittent.
  7. Repair any wiring faults (broken conductors, shorts, chafed areas, corroded terminals). Secure harness away from heat/moving parts. Re-pin/replace connector if terminals damaged.
  8. Clear codes, perform a test drive under the original conditions and monitor for reappearance. If fault persists after sensor/wiring replacement, consider PCM/ECM testing or replacement as last resort.

Likely causes

  • Connector corrosion or a loose connector at the cam sensor
  • Broken or chafed wire in the harness near the sensor or through the engine bay
  • Failing camshaft position sensor (intermittent internal failure)
  • Poor ground or intermittent reference voltage to the sensor
  • Intermittent short to power/ground caused by wiring rubbing or pin damage

Fault status

⚠️ Status
Intermittent camshaft position sensor B circuit fault detected on Bank 2; signal is sporadic or missing.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0344 P0340 P0345 P0335 P0354
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