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SPN 520502 — factory code Meritor (ex-WABCO) and SITRAK

Safe to driveUntil the next service

SPN 520502 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Meritor (ex-WABCO) and SITRAK, and what the second half of the code (FMI) means.

Meritor (ex-WABCO)

FMI 7Wheel Speed Permanent Slip Failure at Axle 1 Right
FMI 9Wheel Speed Jump Down Detection at Axle 1 Right
FMI 13Impermissable Tire Size Detected at Axle 1 Right
FMI 14Impermissable Deviation of Tire Size Detected at Axle 1 Right

SITRAK

FMI 2SCR system efficiency below the threshold. Scan tool code: P2BAE. Effect: Torque limited, MIL on, power may drop to 60%.

What FMI means in J1939

SPN 520502 FMI 2520502/2 · 520502.2data erratic or intermittent
SPN 520502 FMI 7520502/7 · 520502.7mechanical system not responding
SPN 520502 FMI 9520502/9 · 520502.9abnormal update rate
SPN 520502 FMI 13520502/13 · 520502.13calibration out of range
SPN 520502 FMI 14520502/14 · 520502.14manufacturer-specific instructions

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Until the next service

A standalone fault with no immediate consequences for driving.

Show the codes at the next service. If a second code from the same system appears, stop putting it off.

Nearby: other

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.