AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

P0347 indicates a low voltage or weak signal detected from the camshaft position sensor A circuit on bank 2, suggesting wiring, sensor, or control module issues that can impact engine timing and performance

Common Symptoms

Check engine light illuminated
Rough idle or engine misfire-like behavior
Difficulty starting the engine
Reduced engine performance or hesitation

Most Common Causes

Faulty camshaft position sensor (Bank 2 Sensor A) high

Sensor fails to produce adequate voltage or output signal

Wiring harness fault (open, short, corrosion) high

Damaged or corroded wiring/connectors can lead to low signal voltage

Poor connector contact or corrosion medium

Loose or corroded pins can reduce signal quality

Engine control module (ECM/PCM) input circuit issue low

Rare but possible if internal module circuitry fails

Mechanical timing issue (tone ring damage) low

Physical damage to tone wheel triggering the sensor can affect output

Diagnostic Steps

Connect OBD-II scanner and confirm presence of P0347 code

Expected: P0347 is displayed; other related DTCs logged

Interpretation: Code confirms sensor circuit low detection
Visually inspect camshaft position sensor wiring and connector

Expected: No breaks, chafing, or corrosion

Interpretation: Damage suggests wiring fault
Measure voltage and signal at sensor connector with multimeter

Expected: Sensor should produce expected reference voltage and signal

Interpretation: Low or no signal indicates sensor or circuit issue
Check continuity of wiring between sensor and ECM

Expected: Continuity present with minimal resistance

Interpretation: Open or high resistance suggests wiring faults
Replace sensor if testing indicates failure

Expected: Proper signal output and no return of code on retest

Interpretation: Confirms sensor was primary fault

Repair Solutions

Replace camshaft position sensor (Bank 2 Sensor A) medium

Estimated Cost: $100 - $350

Cost varies by vehicle; OEM sensor recommended

Repair or replace damaged wiring/connectors medium

Estimated Cost: $50 - $200

Depends on extent of harness damage

Clean and secure connector contacts easy

Estimated Cost: $10 - $50

Effective if corrosion is minor

Replace or reprogram ECM/PCM if internally faulty hard

Estimated Cost: $800 - $1500

Rare and requires professional diagnostics

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Assuming an engine mechanical timing issue without checking sensor wiring and signal first

Frequently Asked Questions

Can you explain the meaning of P0347?

When your OBD-II scanner reads P0347, it means: Camshaft Position Sensor A Circuit Low (Bank 2). This code is related to the vehicle's Ignition.

How serious is the P0347 code?

You should treat P0347 as a medium issue. May cause engine running issues such as rough idle, hesitation, stalling, or starting problems

Common signs of the P0347 error code

Drivers often report: Check engine light illuminated, Rough idle or engine misfire-like behavior, Difficulty starting the engine when this code is present.

Why is my car throwing a P0347 code?

The most common causes are: Faulty camshaft position sensor (Bank 2 Sensor A), Wiring harness fault (open, short, corrosion), Poor connector contact or corrosion.

Repair cost breakdown for P0347

Repair costs depend on the specific failure. A simple Clean and secure connector contacts replacement is relatively affordable ($10-$50), whereas a Replace or reprogram ECM/PCM if internally faulty repair is more expensive, potentially reaching $1500.

Does code P0347 apply to Mercedes vehicles?

Yes, P0347 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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