U0213 — Data bus: mirror control module A – no communication #

Note: The description of this DTC (Diagnostic Trouble Code) can vary depending on the vehicle manufacturer. Always refer to your OEM (Original Equipment Manufacturer) documentation for the most precise wording.

Known label variations:

• U0213: Lost Communication With Mirror Control Module A (Ford, GM)
• U0213: Mirror Control Module A – No Communication (Mercedes-Benz)
• U0213: Data Bus: Mirror Adjustment Module No Signal/Communication (Volkswagen/Audi)
• U0213: Communication Error with Mirror Module A (Toyota/Lexus)

Code summary for U0213 #

U0213 is a communication fault code indicating that the vehicle’s main data network—known as the CAN bus (Controller Area Network)—has lost contact with the Mirror Control Module A. This module is responsible for managing electric mirror functions on one or both sides of the vehicle, including adjustment, folding, and sometimes heating or memory features. The code is set when the main control unit (often the BCM, or Body Control Module) does not receive expected messages from the mirror module for a set period. This is generally an electrical or network issue, not a mechanical mirror failure. While this code typically doesn’t affect drivability, it can impair convenience or safety features related to the mirrors.

Common symptoms for DTC U0213 #

When U0213 appears, you may notice issues with your vehicle’s mirrors that go beyond simple adjustment problems. The loss of communication can impact several automated or electrical functions. Typical symptoms include:

• One or both electric mirrors not responding to adjustment controls
• Mirror folding/unfolding feature inoperative
• Heated mirrors not working (if integrated)
• Mirror memory positions not recalled or stored
• Warning lights on the dashboard (often a generic electrical or body control warning)
• Mirror turn signals (if equipped) not functioning

Probable causes for DTC U0213 (by frequency) #

This code is most often the result of communication issues between the main vehicle network and the mirror control module. Causes typically include:

1. Faulty or disconnected mirror control module — The module itself may be defective or unplugged.
2. Damaged wiring or connectors — Broken, corroded, or loose wires/connectors at the mirror, door, or junctions along the harness.
3. CAN bus network faults — Shorted, open, or high-resistance connections in the data bus wiring.
4. Blown fuse related to the mirror module or door electronics.
5. Fault in the Body Control Module (BCM) or similar gateway module — Rare, but possible as a root communication hub.
6. Software or firmware mismatch after a module replacement or update.

Step-by-step diagnosis for U0213 #

A methodical approach helps pinpoint the exact fault for U0213. Here’s how a professional would proceed:

• Verify the DTC and check for any additional related codes (especially those indicating network or power supply issues).
• Consult the wiring diagram for your vehicle to identify the mirror module’s location and its communication/power wires.
• Check the relevant fuse(s) for the mirror module and door electronics circuit.
• Inspect physical wiring and connectors at the mirror, inside the door, and in the door jamb for damage, corrosion, or disconnection.
• Use a scan tool to attempt communication directly with the mirror module; lack of response confirms a communication failure.
• Test for voltage and ground at the mirror module connector to rule out power supply issues.
• Check the CAN bus wiring for continuity, shorts, or high resistance between the module, BCM, and junction points.
• If all wiring and power tests normal, substitute with a known-good mirror module if possible, or reprogram/update firmware as recommended by the OEM.

Possible repairs for U0213 #

Repairs will depend on the exact cause found during diagnosis. Common fixes include:

• Repairing or replacing damaged wires or connectors in the mirror or door harness
• Reconnecting or replacing the mirror control module
• Replacing a blown fuse in the door electronics circuit
• Correcting CAN bus wiring faults (repairing opens, shorts, or corroded connections)
• Updating or reprogramming the module with OEM software
• In rare cases, replacing the BCM or another gateway module

Is it safe to drive with code U0213? #

Limited: For most vehicles, you can drive with U0213 set, as it does not affect core engine, braking, or steering functions. However, the inability to adjust or fold mirrors may reduce visibility and safety, especially if mirror defrost or signal indicators are inoperative. If your vehicle relies on electric mirrors for proper lane visibility (e.g., due to window tint or large blind spots), address the issue promptly.

Vehicles most frequently affected by U0213 #

This code appears across many modern vehicles equipped with electrically controlled mirrors and data bus networks. It is particularly common in:

• Ford (F-150, Explorer, Edge, Fusion)
• General Motors (Chevrolet Silverado, GMC Sierra, Cadillac)
• Mercedes-Benz (E-Class, C-Class, Sprinter)
• Volkswagen and Audi (Golf, Passat, A4, Q5)
• Toyota/Lexus (Camry, RAV4, ES Series)
• BMW (3 Series, 5 Series, X5)

Note: The exact impact and module location may differ by vehicle. Always consult your OEM service information for specifics.

Common mistakes & best practices with U0213 #

Misdiagnosis is common if the problem seems “just” like a mirror switch or glass issue. Avoid these pitfalls:

• Replacing the mirror glass or switch without checking the control module or wiring
• Overlooking blown fuses or broken wires in door harnesses
• Ignoring other network or communication codes that may be related
• Neglecting to check for water intrusion or corrosion in door connectors, especially after heavy rain or car washes
• Forgetting to clear codes and perform a full system scan after repairs

Quick FAQ for U0213 #

Here are answers to the most common questions about DTC U0213:

• Q: Can a dead battery trigger U0213?
  A: A very low or dead battery can cause temporary communication errors, but if the code persists after battery charging, further diagnosis is needed.
• Q: Will replacing the mirror fix U0213?
  A: Not necessarily. The issue is with the control module or its communication, not the mirror glass itself. Diagnosis should focus on wiring, modules, and network faults.