The 2013 MX injector fault code P1208 Diagnostic Manual is the official service reference for diagnosing and resolving fuel injector solenoid valve failures on cylinder 5 in PACCAR MX engines compliant with EPA2013 emissions standards. Published by PACCAR, this document provides technicians with wiring diagrams, electrical specifications, and step-by-step troubleshooting procedures for the MX injector fault code P1208, which indicates voltage that is too high or a short circuit to the ECU power supply at pin A4 on the D420 connector.
This manual covers the complete diagnostic workflow for PACCAR MX injector solenoid valve cylinder 5 failures, including component location, control system operation, and injector calibration code requirements for replacement units.
Document details and specifications — MX injector fault
| Brand | PACCAR |
| Model coverage | MX Engines (EPA2013) |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication no. | P1208 |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Code number P1208
- Fault code description: Injector solenoid valve cylinder 5, Voltage too high or short circuit to supply on ECU
- Fault code information (1 trip MIL, 3 drive cycle recovery)
- Description of component(s) and control operation
- Injector codes and calibration requirements
- Location of component(s)
- Diagnostic condition and set/reset conditions
- Electrical diagram(s) – D420, B460, B461 connectors and B421–B426 solenoid valve injectors
- Technical data – component check and resistance specifications
- Diagnostic step-by-step troubleshooting procedure (Steps 1–4)
- Verification drive cycle procedure
Applies to these models
This MX injector fault code manual applies to 2013 and later PACCAR MX diesel engines equipped with EPA2013-compliant fuel injection systems. It covers cylinder 5 solenoid valve injector diagnostics on vehicles using the D420 PCI ECU and B461 connector assemblies. For official PACCAR engine documentation and technical support, visit PACCAR official.
Who needs this injector fault code manual
Diesel truck mechanics, workshop owners, and diagnostic technicians working on PACCAR MX-powered commercial vehicles need this injector fault code guide to quickly identify and repair cylinder 5 solenoid valve electrical failures. The fault code P1208 requires precise electrical measurement and injector calibration verification to avoid reduced engine performance and driver warnings.
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