B2347: Door Module Low Reference Voltage
The B2347 code indicates that the Driver Door Module (DDM) or Passenger Door Module (PDM) has detected a low voltage condition on the 5-volt reference circuit that powers the power mirror switch. This reference voltage is used by the door module to monitor the switch contacts; when the voltage drops below a calibrated threshold, the diagnostic trouble code is set.
1. Commonly Affected Makes
2. Most Common Causes
- 5-volt reference circuit shorted to ground in the door harness
- Faulty power mirror switch (internal short)
- Faulty door control module (DDM/PDM)
- Corroded, loose, or damaged terminals in door harness connectors
- Wiring damaged due to wear in the door hinge area
3. Symptoms You Will Notice
- Power mirrors may not adjust or respond intermittently
- Mirror switch may feel unresponsive or cause erratic mirror movement
- Other door module functions may be affected
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to door wiring or mirror switch issues
Inspect the door harness and connectors, especially near the hinge area, for damage or corrosion
Test the 5-volt reference circuit at the mirror switch connector for proper voltage (should be ~5V)
If voltage is low, isolate the circuit by disconnecting the mirror switch; if voltage returns, replace the switch
If voltage remains low, check for a short to ground in the harness or a faulty door module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but the power mirrors may not function properly. The issue is electrical and does not affect critical safety systems.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the cause is a simple wiring repair, a switch replacement, or a door module replacement.