This document is the 2013 PACCAR MX diagnostic service manual page covering MX engine diagnostic codes, specifically fault code P1272. Published by PACCAR for technicians servicing medium and heavy-duty trucks equipped with MX-series engines compliant with EPA 2013 emissions standards, this single-page reference addresses combustion imbalance detection in cylinder 4.
The MX engine diagnostic codes manual provides essential troubleshooting information for workshop technicians and fleet mechanics who need to diagnose and resolve engine performance faults quickly and accurately.
Document details and specifications — MX engine diagnostic
| Brand | PACCAR |
| Model coverage | Trucks with MX-series engines |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication number | Not specified in extract |
| Year/Revision | 2013 |
| Pages | 1 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Table of contents
- Code number P1272
- Fault code description: Increase in combustion in cylinder 4 relative to the others
- Fault code information
- Description of component(s)
- Location of component(s)
- Diagnostic condition
- Set condition of fault code
- Reset condition of fault code
- Electrical diagram(s)
- Technical data
- Possible causes
- Additional information
- Diagnostic Step-by-Step
- Verification Drive Cycle
Applies to these models
This engine diagnostic codes reference applies to trucks equipped with PACCAR MX-series diesel engines manufactured to meet EPA 2013 emissions regulations. For official PACCAR engine specifications and technical support resources, visit PACCAR official website.
Who needs this engine diagnostic codes manual
Diesel truck mechanics, diagnostic technicians, and workshop owners working on PACCAR-powered vehicles require this engine diagnostic codes manual to accurately identify and repair fault code P1272 and related combustion issues. Engine support specialists and fleet maintenance managers also benefit from the step-by-step diagnostic procedures and technical data included in this reference.
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