Fault Family System: Network (U-Codes) 9 SAE Codes

MS CAN Bus Fault

Diagnostic & Technical Explanation

U0010 indicates the medium-speed CAN segment (roughly 125 kbps, typically shared by the BCM, HVAC, and comfort/convenience modules) is not passing valid traffic. Unlike the high-speed backbone, this segment often uses lighter-gauge unshielded twisted wire routed through the dash and door sill pass-throughs, making it more prone to damage from trim removal and water intrusion at the cowl than to engine-bay heat chafe. Diagnosis still starts with confirming roughly 60 ohms across the two wires with the network asleep, then working outward from the dash toward each accessory module.

These 9 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 9 times.

Codes in this family (9)

Code	Definition	Repair coverage
U0010	Medium Speed CAN Communication Bus	4 ranked fixes
U0011	Medium Speed CAN Communication Bus Performance	4 ranked fixes
U0012	Medium Speed CAN Communication Bus (+) Open	4 ranked fixes
U0013	Medium Speed CAN Communication Bus (+) Low	4 ranked fixes
U0014	Medium Speed CAN Communication Bus (+) High	4 ranked fixes
U0015	Medium Speed CAN Communication Bus (-) Open	4 ranked fixes
U0016	Medium Speed CAN Communication Bus (-) Low	4 ranked fixes
U0017	Medium Speed CAN Communication Bus (-) High	4 ranked fixes
U0018	Medium Speed CAN Communication Bus (-) shorted to Bus (+)	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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