P0349 medium Severity

P0349: Camshaft Position Sensor A Circuit Intermittent (Bank 2)

Intermittent performance issues including rough idle, hesitation, stalling, and potential loss of power; check engine light illuminated

Overview

OBD-II code P0349 indicates an intermittent electrical fault in the camshaft position sensor A circuit on bank 2, often due to wiring or sensor issues disrupting the camshaft position signal to the powertrain control module.

Common Symptoms

  • Check engine light illuminated
  • Intermittent rough idle or engine bucking
  • Hesitation or loss of power during acceleration
  • Intermittent stalling or inability to start

Most Common Causes

Intermittent open or short in camshaft position sensor wiring high

Intermittent wiring or connector issues (chafed, corroded, loose) are frequently noted as primary causes.

Faulty camshaft position sensor high

The sensor itself may fail internally and produce an intermittent or unstable signal.

Faulty ECM/PCM input circuit medium

In some cases, the control module’s camshaft input circuitry may have faults or software calibration issues.

Damage to sensor tone ring or timing components medium

Physical damage to the tone ring or timing system can affect the sensor signal intermittently.

Diagnostic Steps

  1. Use an OBD-II scanner to verify the presence of P0349 and observe live camshaft position sensor data
    Expected: Code present and intermittent signal fluctuations visible in live data
    Interpretation: Confirms intermittent fault rather than a constant signal loss
  2. Visually inspect the camshaft position sensor wiring and connector on bank 2
    Expected: No chafed wires, corrosion, loose pins, or damaged insulation
    Interpretation: If wiring/connectors are damaged, repair or replace before further testing
  3. Measure sensor reference voltage and signal output with a multimeter
    Expected: Steady reference voltage (~5V) and appropriate changing signal with camshaft rotation
    Interpretation: If voltage is inconsistent or no signal, suspect sensor or wiring issue
  4. Check for related Technical Service Bulletins (TSBs) and possible ECM calibration updates
    Expected: Available updates or documented issues for specific models
    Interpretation: Apply updates if available to address software-related intermittent readings
  5. Replace camshaft position sensor if testing confirms faulty output
    Expected: Consistent signal and code clears after replacement
    Interpretation: Confirms sensor was root cause

Repair Solutions

Repair or replace damaged camshaft position sensor wiring/connectors medium
Estimated Cost: $50 - $250

Costs vary depending on extent of wiring damage and labor rates

Replace camshaft position sensor easy
Estimated Cost: $100 - $300

Sensor replacement cost including parts and labor

ECM/PCM reprogramming or replacement hard
Estimated Cost: $200 - $1200

Reprogramming often less expensive; replacement required if internal circuitry damaged

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Replacing only the camshaft position sensor without checking wiring or connectors
  • Assuming the crankshaft position sensor is at fault without verifying camshaft circuit data

Frequently Asked Questions

What does the P0349 code mean?

When your OBD-II scanner reads P0349, it means: Camshaft Position Sensor A Circuit Intermittent (Bank 2). This code is related to the vehicle's Sensors.

Can P0349 cause engine damage?

With a severity level of medium, intermittent performance issues including rough idle, hesitation, stalling, and potential loss of power; check engine light illuminated

How do I know if I have code P0349?

Common symptoms include: Check engine light illuminated, Intermittent rough idle or engine bucking, Hesitation or loss of power during acceleration. You might also notice the Check Engine Light is on.

What parts fail when P0349 is set?

It can be caused by several factors, most notably: Intermittent open or short in camshaft position sensor wiring, Faulty camshaft position sensor, Faulty ECM/PCM input circuit.

Repair cost breakdown for P0349

It depends on what needs to be fixed. Repair or replace damaged camshaft position sensor wiring/connectors repairs are cheaper (~$250), while ECM/PCM reprogramming or replacement repairs are on the higher end (~$1200).

Does code P0349 apply to Mercedes vehicles?

This is a universal code. You might see P0349 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

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