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DTC code page

P0347: Camshaft Position Sensor A Circuit Low Input (Bank 2)

Quick answer: The ECU sees the Bank 2 camshaft position sensor A signal too low or too weak to trust.

Drivers also search this fault as bank 2 cam sensor low input, bank 2 camshaft sensor low voltage, weak bank 2 cam signal.

Severity: high Family: powertrain Related paths: 10
Meaning

What P0347 usually means

P0347 means the Bank 2 cam sensor A input is weak or biased low. That often comes from a failing sensor, corroded connector, high-resistance wiring, low cranking voltage, or a signal that only falls apart on hot restarts or during a difficult start event.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Check battery condition and cranking voltage before blaming the Bank 2 sensor alone.
  • Inspect the Bank 2 cam connector for oil intrusion or poor pin fit.
  • If the complaint is heat-soak long crank, keep intermittent low-signal behavior in mind.
Driving risk

Can you keep driving?

P0347 can leave the vehicle hard to start or unable to restart when hot, so it is not a wait-and-see code.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Likely causes

Common causes behind this code

  • Weak or failing Bank 2 camshaft position sensor A
  • Corroded, loose, or oil-soaked connector on the Bank 2 circuit
  • High resistance or partial short in the signal path
  • Low battery or cranking voltage making the signal too weak to process
  • Poor ground or reference integrity to the sensor

Cause phrases often tied to this code: weak bank 2 cam sensor, connector corrosion, wiring resistance, low voltage, oil contamination.

Diagnostic order

Suggested workflow

  1. Verify battery voltage and stable cranking speed.
  2. Inspect Bank 2 cam sensor connector condition, pin tension, and harness routing.
  3. Check whether scan data shows delayed or missing Bank 2 cam sync during cranking.
  4. Test the sensor and circuit if no obvious voltage-drop issue is visible.
  5. Recheck sync behavior after the repair under the same start conditions.
Avoid guesswork

Common mistakes

  • Replacing the sensor without correcting corroded or oil-filled connectors.
  • Skipping battery and voltage-drop checks on a low-input code.
  • Assuming P0347 rules out a wider Bank 2 timing problem.
Repair path

Practical fix guidance

  • Correct the low-input cause first, then verify repeated clean starts and stable Bank 2 sync.
  • If other Bank 2 correlation codes remain, continue into timing diagnosis.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0347

Useful when the driver knows the wording but not the exact DTC yet.

  • bank 2 cam sensor low input
  • bank 2 camshaft sensor low voltage
  • weak bank 2 cam signal
Related search intent

Queries this page can answer naturally

  • P0347 code meaning
  • what does P0347 mean
  • bank 2 cam signal low
  • bank 2 cam sensor low voltage
FAQ

Quick questions about P0347

Can low battery voltage trigger P0347?

Yes. Weak cranking can make the Bank 2 cam signal look too small or unstable for the ECU to trust.

Does P0347 always mean the Bank 2 sensor is bad?

No. Wiring resistance, connector damage, oil contamination, and poor voltage supply can all produce it.

Why is P0347 often worst during startup?

Because cranking is when voltage stability and signal amplitude are most likely to become marginal.