This PACCAR U1874 CAN message of range diagnostic document provides technicians with complete troubleshooting procedures for MX EPA engine control units. Published by PACCAR and sourced from their Rapido dealer portal, this technical guide covers the set conditions, diagnostic routines, and repair verification steps for resolving message range faults in CAN communication networks.
The document applies to PACCAR MX EPA 2004 and MX EPA 2013 engine variants where the CAN message out of range condition affects ECU operation and drivability.
Document details and specifications — PACCAR U1874 CAN
| Brand | PACCAR |
| Model coverage | MX EPA engines |
| System/Group | DTCs / MX Europe Engines (EPA 2004) |
| Publication number | U1874 |
| Year/Revision | 18-Aug-2017 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Set conditions – CAN message received but signal value out of expected range
- Diagnostic condition – continuous run when ignition keyed on or engine running
- Corresponding OBD readiness monitor
- Reset condition – DTC changes to inactive after diagnostic passes
- Repair verification – clear DTCs, test drive, confirm DTC status
- Possible cause – corrupt/empty CAN message or system malfunction in originating module
- Additional information – message out of range DTC indicates remote system fault with CAN communication example
Applies to these models
This PACCAR U1874 CAN message of range guide covers MX EPA 2004 and MX EPA 2013 engine control modules in PACCAR medium and heavy-duty trucks. The diagnostic applies to any ECU receiving corrupted or out-of-range signals across the CAN network from upstream sensors or control modules. PACCAR official website
Who needs this PACCAR U1874 CAN message of range manual
Diesel technicians and workshop owners diagnosing CAN communication faults on PACCAR-equipped trucks need this U1874 CAN message out of range reference. The manual explains how message range violations originate in remote systems rather than the reporting ECU, directing repair efforts to the correct circuit or sensor.
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