The PACCAR MX P112C page of the 2013 PACCAR MX Diagnostic Service Manual is the manufacturer reference for diagnostic trouble code P112C, described in the manual as “CAN communication – Message (AT1FC1) out of range – Fuel rate from emission system”. It is a 4-page PDF section covering CAN communication diagnostics on EPA2013 PACCAR MX engines, and it keeps the same layout as every other code page in that manual.
Document details and coverage
| Brand | PACCAR |
| Model coverage | PACCAR MX engines, EPA2013 emissions |
| System group | DTCs / MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Fault code | P112C |
| Subject | CAN communication |
| Pages | 4 |
| File size | 0.6 MB |
| Format | |
| Language | English |
What PACCAR MX P112C means
The manual files P112C as a 1 trip MIL code with 3 drive cycle recovery, readiness group None and freeze frame type Generic. The diagnostic runs continuously when the ignition is on. The code sets when the received fuel rate value in message AT1FC1 is more than 3213 L/h, and it changes to inactive as soon as the error is no longer detected.
Possible causes and technical data
- Check the aftertreatment for fuel consumption
The manual states that this code relates to a communication issue and not to a specific component, so there is no component resistance table to work through. The page then runs 4 numbered troubleshooting steps, each with its own step ID, starting from a visual inspection of connectors and harness with the ignition off. The manual warns against back probing, notes that disconnecting the EAS connectors during troubleshooting produces multiple errors, and reminds the technician to exit the fault code menu in DAVIE and rerun the test before judging whether anything changed.
Who needs this PACCAR MX P112C manual page
Heavy-duty technicians, fleet shops and independent workshops diagnosing Kenworth and Peterbilt trucks with EPA2013 PACCAR MX engines use this page to confirm what the ECU actually measured before parts are ordered. For engine literature, dealer locations and support contacts beyond this single code, start at the PACCAR corporate website.
The complete PACCAR MX P112C extract from the 2013 PACCAR MX Diagnostic Service Manual is filed in the DiagTechPro manuals library, where the 4-page PDF can be viewed or downloaded with a free account.
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