Fault Family System: Network (U-Codes) 14 SAE Codes

Invalid Data Lighting Module

Diagnostic & Technical Explanation

U0481 sets when an exterior lighting module reports a beam-position, load, or status value outside a plausible range while still communicating normally -- commonly seen after an aftermarket bulb or LED conversion that the module's load-sensing circuit was never designed to read, or a headlamp leveling sensor that has slipped out of alignment after suspension work. The fix targets the specific sensor or load circuit rather than the lighting network itself.

These 14 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 14 times.

Codes in this family (14)

Code	Definition	Repair coverage
U0481	Invalid Data Received From Automatic Lighting Control Module	4 ranked fixes
U0482	Invalid Data Received From Headlamp Leveling Control Module A	4 ranked fixes
U0483	Invalid Data Received From Lighting Control Module - Front	4 ranked fixes
U0484	Invalid Data Received From Lighting Control Module - Rear A	4 ranked fixes
U048B	Invalid Data Received From Headlamp Leveling Control Module B	4 ranked fixes
U0542	Invalid Data Received From Headlamp Control Module A	4 ranked fixes
U0543	Invalid Data Received From Headlamp Control Module B	4 ranked fixes
U054B	Invalid Data Received From Interior Lighting Control Module A	4 ranked fixes
U0553	Invalid Data Received From Lighting Control Module - Rear B	4 ranked fixes
U0574	Invalid Data Received From Lighting Driver Control Module 'A'	4 ranked fixes
U0575	Invalid Data Received From Lighting Driver Control Module 'B'	4 ranked fixes
U0576	Invalid Data Received From Lighting Driver Control Module 'C'	4 ranked fixes
U0577	Invalid Data Received From Lighting Driver Control Module 'D'	4 ranked fixes
U05C0	Invalid Data Received From Interior Lighting Control Module B	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

Need All 15,886 Codes as Data?

Pipe-delimited CSV, Apache Parquet and a relational SQLite database, with commercial application rights and instant download. Built for scan tools, shop software and research - not assembled one web page at a time.

License OEM Complete · $149 Standard (SAE only) · $49

$49 Standard: 9,249 SAE codes · $149 OEM Complete: all 15,886 codes, including 6,637 OEM codes across 32 makes · $149 Heavy Duty: 4,212 fault pairs (J1939) · one-time · compare tiers