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Home / DTC / U054B — Invalid Data Received From Interior Lighting Control Module A

U054B — Invalid Data Received From Interior Lighting Control Module A

Detailed page for trouble code U054B.

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Code

U054B

Generic U — Network/User

Invalid Data Received From Interior Lighting Control Module A

Brand: Generic
Type: U — Network/User
Views: UK: 14 EN: 20 RU: 11
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Page language: EN

Causes

  • Faulty or malfunctioning interior lighting control module (ICM A)
  • Corrupted or mismatched software/firmware in the lighting module
  • Open, shorted, or intermittent wiring/connectors to the module
  • Loss of module power or poor ground connection
  • Physical-layer network fault on CAN/LIN (bus short, high resistance, or termination issue)
  • Faulty gateway or body control module interpreting messages incorrectly

Symptoms

  • Dome/map/ambient lighting flicker, dim, or not function normally
  • Interior lighting features (delays, fade, zone control) behave erratically
  • Warning or message on cluster indicating communication fault
  • Multiple network-related U-codes present
  • Possible battery drain if module is stuck awake or repeatedly retransmitting

What to check

  • Read all stored and pending codes from all modules; record freeze-frame and module presence
  • Check battery voltage and charging system; ensure stable 12–14 V while diagnosing
  • Inspect connectors and wiring at the interior lighting module, gateway, and BCM for damage, corrosion, or loose pins
  • Scan the network to confirm whether the interior lighting module is present and sending expected messages
  • Check for other U-codes that indicate bus or gateway issues (U0100, U0073, etc.)
  • Perform a wiggle/tug test on harnesses while monitoring bus messages for dropouts

Signal parameters

  • CAN bus idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V; dominant state typically pushes CANH higher and CANL lower (manufacturer-dependent)
  • Typical CAN data rates for body networks: 125 kbps, 250 kbps, or 500 kbps — confirm vehicle-specific rate
  • Expected module supply: battery voltage ~11–14 V with ignition states per service manual
  • Bus termination resistance: two 120 Ω resistors in parallel ≈ 60 Ω on CAN (verify actual resistance per vehicle)
  • LIN bus idle ≈ battery voltage via pull-up (if applicable) and single-wire timing characteristics (if lighting module uses LIN)

Diagnostic algorithm

  1. Retrieve all U-codes and related codes from every module. Note time stamps and freeze-frame data.
  2. Verify battery state and charging system. Perform diagnosis with stable voltage (use battery charger if needed).
  3. Visually inspect the interior lighting module connector, pins, and harness for corrosion, bent pins, water intrusion, or damage.
  4. With a scan tool, confirm the interior lighting module is present on the network and observe incoming/outgoing message stream. Note absent or malformed messages.
  5. Check for other network faults (bus-off, excessive errors). If the bus shows errors, measure CANH/CANL at multiple nodes (module, BCM, gateway) with an oscilloscope or multimeter.
  6. Perform a wiggle test on the interior lighting harness and connectors while monitoring network traffic for interruptions or changes.
  7. If physical layer and wiring check OK, verify module software/part number against OEM data. Reflash or reprogram per manufacturer service procedure if an update or calibration is available.
  8. If reprogramming does not clear the fault and wiring/power/ground are confirmed good, replace the interior lighting control module with a correctly programmed unit.
  9. After repairs, clear DTCs, cycle ignition and perform functional checks of interior lighting. Monitor for reappearance of U054B and related codes.
  10. If code returns, escalate to manufacturer-specific diagnostics (gateway interrogation, advanced message logging) before replacing additional modules.

Likely causes

  • Loose or corroded connector at the interior lighting module
  • Damaged CAN/LIN wiring (pinched/chafed) between module and gateway/BCM
  • Module in a software state that produces invalid messages (requires reprogramming)
  • Intermittent ground or supply to the module causing message corruption
  • Network termination missing or resistance out of spec on the bus

Fault status

⚠️ Status
Invalid data received from Interior Lighting Control Module A — communication payload/parameters corrupted, out of expected range, or module sending unexpected messages.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0144 U0155 U0073 U1104
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