PREVOST H3-45 2023 Operator's Manual page 272

C-18 Allison Transmission Other Features
DTC
U1401 J1939 TSC1 Engine Message Impostor Detected
J1939 TSC1 Compression Brake Message Impostor
U1402
Detected
J1939 TSC1 Exhaust Brake Message Imposter
U1403
Detected
*5th Generation only
**6th Generation only
Description
PA-1652 Operator's Manual H3-45 Coach
CHECK Inhibited Operation
Light Description
None
None
None