Error code

OBD2 P0347

OBD2P0347
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Camshaft Position Sensor 'A' Circuit Low.

Severity

moderateThe vehicle may be drivable but will likely experience poor performance.

Summary

P0347 indicates a low input signal from Camshaft Position Sensor A on bank 2 of an engine with two banks.

Symptoms

  • No-start or start-stall condition
  • Hard starting, rough running, misfiring, poor acceleration

Common Causes

  • Faulty camshaft position sensor (CMP) circuit
  • Poor installation of the CMP sensor with incorrect clearance to the reluctor ring or camshaft tooth
  • Electrical interference from alternator phase problems in Ford vehicles
  • Rodent damage to wiring and connectors
  • Connector breakage and wire insulation damage due to aging plastic and rubber components

Diagnosis

  1. Visual inspection of the CMP sensor connection and wiring harness for damage
  2. Resistance check to confirm if the sensor is open or short-circuited
  3. Signal check using a digital oscilloscope or DVOM in AC V mode
  4. Electrical inspection including resistance, open circuit, and short-to-ground checks

Fixes

  • Replace the faulty camshaft position sensor if diagnosed as the cause

FAQ

Can I drive with P0347?

The vehicle may be drivable but will likely experience poor performance and starting issues.

What should I check first when diagnosing P0347?

Start by visually inspecting the CMP sensor connection and wiring harness for any damage or loose connections.

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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