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Home / DTC / U0514 — Invalid Data Received From Mirror Control Module

U0514 — Invalid Data Received From Mirror Control Module

Detailed page for trouble code U0514.

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Code

U0514

HYUNDAI U — Network/User

Invalid Data Received From Mirror Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Mirror Control Module (MCM)
  • Open, shorted, damaged or corroded wiring/connectors between MCM and CAN bus
  • CAN bus low-level faults (short to voltage/ground, high resistance, missing termination)
  • Poor or missing power or ground to the MCM
  • Software mismatch, corrupted module programming, or module configuration error
  • Intermittent connections (water intrusion, broken wires, connector pins)

Symptoms

  • Mirror features not working (folding, memory, heater, turn signal, auto-dip)
  • Warning or error messages on instrument cluster related to mirrors
  • Intermittent or permanent inability to control mirror position
  • Other networked modules showing related communication warnings
  • DTC returns after reconnecting battery or after door wiring movement

What to check

  • Retrieve freeze frame and full network DTC list with a capable scan tool
  • Verify J1939/CAN or manufacturer-specific CAN nodes — confirm MCM is present on bus
  • Visually inspect mirror connector(s), door harness, and body-to-door grommet for damage or corrosion
  • Check MCM power (battery/ignition) fuse(s) and test for proper Vbatt and ground at module connector
  • Measure CANH/CANL voltage at the MCM connector with ignition ON (compare to known-good values)
  • Wiggle-test wiring while monitoring for code changes to locate intermittent faults

Signal parameters

  • CAN bus idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V; dominant bits: CANH ≈ 3.5 V, CANL ≈ 1.5 V
  • Listen for MCM node on the high-speed CAN network (module should periodically transmit status messages)
  • Typical message frequency: mirror status/heartbeat pulses at regular intervals (tool-specific)
  • Supply voltage to MCM: battery voltage present with key ON (nominal 11–14.5 V)
  • Ground: continuity from MCM ground pin to chassis ground (

Diagnostic algorithm

  1. Connect a bi-directional manufacturer-level scan tool. Read and record U0514 and all related U-codes and freeze frame data.
  2. Clear codes. Attempt to reproduce the concern (operate mirror functions, cycle ignition, move door harness) while watching for reappearance.
  3. Verify power and ground at the mirror control module connector: measure battery voltage at Vbatt pin and check ground continuity to battery negative.
  4. Inspect mirror connector, wiring through door hinge/boot and harness for physical damage, chafing, corrosion, or pin push-out. Repair any faults.
  5. With ignition ON, backprobe CANH and CANL at the MCM connector. Confirm proper idle voltages and message activity using a scan tool or oscilloscope. Compare with a known-good reference if available.
  6. If CAN bus levels are abnormal, isolate by disconnecting the mirror module and checking bus behavior (do other nodes communicate normally?). Repair short or open conditions and restore proper termination.
  7. If wiring and bus are good but module does not respond or transmits invalid data, try reprogramming/reflashing the mirror control module per manufacturer procedure. Ensure correct calibration and software version.
  8. If reprogramming fails or module still communicates incorrectly, replace the mirror control module. After replacement, perform module initialization, coding, and function tests.
  9. After repairs, clear DTCs and verify that the code does not return after normal vehicle operation and several key cycles.

Likely causes

  • Corroded or loose connector at mirror control module
  • CAN bus short (CANH/CANL) or missing termination near mirror module
  • Mirror module lost Vbatt or ground due to wiring fault or blown fuse
  • Module firmware corrupted after previous repairs or battery disconnect
  • Physical damage to mirror assembly wiring harness (door hinge area)

Fault status

⚠️ Status
Invalid data received from Mirror Control Module — communication or data integrity fault from the mirror control module on the vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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371

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