Fault Family System: Network (U-Codes) 24 SAE Codes

Lost Comm Body Module

Diagnostic & Technical Explanation

U013F (Lost Communication With Pedestrian Alert Control Module) means another module can no longer see the body control module, serial data gateway, security/immobilizer module, or a similar cabin-electrical hub on the body CAN network. These modules typically live behind a kick panel or under the dash and their connectors are exposed to condensation from HVAC ducting and to fretting corrosion from repeated trim removal during other service, rather than the engine-bay heat that affects powertrain nodes. Because the BCM/gateway often bridges multiple bus segments, a single failed connector here can look like several unrelated modules going offline at once.

These 24 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 24 times.

Codes in this family (24)

Code	Definition	Repair coverage
U013F	Lost Communication With Pedestrian Alert Control Module	4 ranked fixes
U0140	Lost Communication With Body Control Module	4 ranked fixes
U0141	Lost Communication With Body Control Module A	4 ranked fixes
U0142	Lost Communication With Body Control Module B	4 ranked fixes
U0143	Lost Communication With Body Control Module C	4 ranked fixes
U0144	Lost Communication With Body Control Module D	4 ranked fixes
U0145	Lost Communication With Body Control Module E	4 ranked fixes
U0146	Lost Communication With Serial Data Gateway Module A	4 ranked fixes
U0147	Lost Communication With Serial Data Gateway Module B	4 ranked fixes
U0148	Lost Communication With Serial Data Gateway Module C	4 ranked fixes
U0149	Lost Communication With Serial Data Gateway Module D	4 ranked fixes
U0150	Lost Communication With Serial Data Gateway Module E	4 ranked fixes
U0167	Lost Communication With Vehicle Immobilizer Control Module	4 ranked fixes
U0168	Lost Communication With Vehicle Security Control Module	4 ranked fixes
U01B7	Lost Communication With Switch Input Module 'A'	4 ranked fixes
U01B8	Lost Communication With Switch Input Module 'B'	4 ranked fixes
U01B9	Lost Communication With Switch Input Module 'C'	4 ranked fixes
U0212	Lost Communication With Steering Column Control Module	4 ranked fixes
U0214	Lost Communication With Remote Function Actuation Module	4 ranked fixes
U0231	Lost Communication With Rain Sensing Module	4 ranked fixes
U0234	Lost Communication With Convenience Recall Module	4 ranked fixes
U0236	Lost Communication With Column Lock Module	4 ranked fixes
U0248	Lost Communication With Remote Accessory Module	4 ranked fixes
U0254	Lost Communication With Remote Start Module	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)

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