B2347 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

• feature inoperative intermittently
• module resets or glitches
• related warning lamp illuminated

Common causes

• High circuit resistance affecting mirror switch reference voltage positive common supply low voltage
• Sensor output out of expected lower range
• Connector pin damage/corrosion or harness stress near related components

How to diagnose B2347

1. Confirm B2347 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to mirror switch reference voltage positive common supply low voltage for obvious defects.
3. Compare live data against expected lower threshold and verify ground/reference circuits.
4. Check for related DTCs to identify the root-cause chain before replacing parts.
5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code B2347

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with B2347?

Most vehicles can be driven short-term with B2347, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
2. Address the root fault mode (low) in the mirror switch reference voltage positive common supply low voltage circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify B2347 remains cleared under the conditions that originally set the code.

Fix options

• Repair connector resistance issues.
• Replace failed sensor if signal remains low.
• Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$160-$850

Common mistakes when diagnosing B2347

• Replacing parts without verifying voltage, ground, and signal integrity first.
• Ignoring related stored/pending codes that indicate upstream faults.
• Skipping post-repair verification drive cycle and readiness checks.

B2347 in common vehicles

B2347 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes B2347?

B2347 is commonly set by low faults affecting mirror switch reference voltage positive common supply low voltage.

How much does it cost to fix B2347?

For B2347, repair costs are typically $160-$850 depending on exact root cause, labor rates, and part quality.

Can I clear B2347 without repair?

You can clear B2347 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

• Estimate repair cost
• Decode your VIN
• Calculate fuel cost