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Home / DTC / U044F — Invalid Data Received From Mirror Control Module B

U044F — Invalid Data Received From Mirror Control Module B

Detailed page for trouble code U044F.

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Code

U044F

Generic U — Network/User

Invalid Data Received From Mirror Control Module B

Brand: Generic
Type: U — Network/User
Views: UK: 15 EN: 22 RU: 16
AI status
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Page language: EN

Causes

  • Intermittent or failed electrical supply (power or ground) to Mirror Control Module B
  • Corroded, damaged, or loose connector/wiring between module and wiring harness
  • Faulty Mirror Control Module B hardware or internal software fault
  • CAN/LIN bus communication fault (open, short, high resistance, missing termination)
  • Conflicting or corrupted messages from another module or aftermarket device
  • Module software/calibration mismatch after replacement or update

Symptoms

  • Exterior mirror functions partially or completely inoperative (adjust, fold, heater)
  • Warning or notice for mirror or body systems on the instrument cluster
  • Intermittent mirror operation or erratic movement
  • Related modules reporting communication or data errors
  • Mirror position or status values shown as invalid or blank in diagnostic tool

What to check

  • Read and record all related U-codes and freeze-frame data; note if code is stored or pending
  • Visually inspect mirror housing, connector(s), and wiring for damage, corrosion, or water intrusion
  • Check fuse(s) and power feed to the mirror and associated control module
  • Verify good ground(s) for mirror circuit and nearby chassis grounds
  • Use a scan tool to verify Mirror Control Module B is present on the network and awake
  • Check for software/PCM/BODY control module TSBs or calibration updates related to mirror modules

Signal parameters

  • CAN/LIN network presence: module should transmit periodic 'heartbeat' messages (manufacturer-specific ID) while awake
  • Expected message frequency: typically periodic (example: 1–10 Hz) — verify consistent timing, not bursts or gaps
  • CAN bus voltages (typical): recessive ~2.5 V on CANH and CANL; dominant states ~CANH 3.5 V / CANL 1.5 V — verify with scope
  • Supply voltage to mirror module: battery voltage ~11–14.5 V with ignition on
  • Module ground: near 0 V with good continuity to chassis ground
  • Reported data fields to check (examples): mirror position, fold/unfold state, heater command — values should be within expected ranges and consistent with driver inputs

Diagnostic algorithm

  1. Verify the code: clear the code, cycle ignition, and see if U044F returns. Note whether it is permanent, stored, or intermittent.
  2. Gather context: record freeze-frame and related DTCs. Identify whether the vehicle has more than one mirror module (A/B) and which is reporting.
  3. Visual inspection: inspect mirror assembly, wiring harness, connector seals, and related body harness routes for damage or water entry.
  4. Power/ground: with connector disconnected, check for proper battery voltage at the module power pin and good continuity to ground.
  5. Network presence: using a scan tool, confirm Mirror Control Module B is detected and check live data for expected parameters. Note any invalid or out-of-range fields.
  6. Bus integrity: check CAN/LIN bus wiring for opens, shorts to power/ground, and correct termination. Use an oscilloscope or a good CAN tester to check signal voltages and message timing.
  7. Wiggle test: with scan tool connected, gently manipulate wiring and connectors to try to reproduce the fault and identify intermittent faults.
  8. Isolate modules: if another module is suspected of sending bad messages, disconnect it (if safe) to see if U044F clears.
  9. Update/reflash: check for available software updates or reflash procedures for the mirror module and related body control modules; perform only per manufacturer procedures.
  10. Replace module: only after verifying power, ground, wiring integrity, and network health, consider replacing Mirror Control Module B. Re-test and clear codes; verify repair.
  11. Post-repair: verify no new communication errors, confirm normal mirror function, and run any required relearn or calibration procedures.

Likely causes

  • Corroded connector at mirror module or water intrusion into mirror housing
  • Broken or chafed CAN or LIN wiring to mirror module
  • Failed mirror control module due to moisture or impact
  • Missing or high-resistance ground at mirror or control module
  • Module sending out-of-range telemetry due to degraded internal sensor or firmware

Fault status

⚠️ Status
Invalid data received from Mirror Control Module B — messages from the mirror module are malformed, inconsistent, or outside expected ranges.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0121 U0144 U0415 U0401
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