The PACCAR MX Engine P1168 Code diagnostic guide is a technical reference manual published by PACCAR for mechanics and workshop technicians diagnosing fuel temperature faults on 2013 MX diesel engines. This 5-page service document covers the complete diagnostic workflow for P1168, a data valid but too high fuel temperature condition that triggers engine torque limitation and activates the MIL for up to three drive cycles.
P1168 is triggered when the PCI ECU (D420) detects fuel temperature exceeding 95°C [203°F] for more than 300 seconds during engine operation. The PACCAR MX Engine P1168 Code manual provides step-by-step diagnostic procedures, electrical schematics, component location maps, and resistance specifications for the fuel temperature sensor F803 across a full temperature range from 0°C to 100°C.
Document details and specifications — PACCAR MX Engine
| Brand | PACCAR |
| Model coverage | 2013 PACCAR MX Engines (EPA2013) |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication number | P1168 (Diagnostic Code) |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Fault code P1168 description and information
- Effect on system and component description
- Diagnostic conditions and set/reset criteria
- Electrical diagrams and wiring harness connector pinouts (D420.A and F803)
- Technical data: fuel temperature sensor F803 resistance values by temperature
- Component and wiring check procedures for ECU D420
- Possible causes and additional information
- Diagnostic step-by-step troubleshooting (Steps 1–10, IDs 1168a–1168j)
- Verification drive cycle procedure
Applies to these models
This PACCAR MX Engine P1168 Code manual applies exclusively to 2013 PACCAR MX diesel engines equipped with EPA2013 emissions control systems. The diagnostic procedures address fuel temperature measurement in the low-pressure fuel supply gallery between common rail pump units and cover the fuel temperature sensor F803, ECU D420, and related wiring harnesses. For official PACCAR engine documentation and support contact information, visit PACCAR official.
Who needs this MX Engine P1168 Code manual
This guide is essential for diesel mechanics, fleet service technicians, and workshop owners diagnosing fuel temperature faults on 2013 PACCAR MX engines. The MX Engine P1168 Code manual is required when P1168 appears on the diagnostic scan tool, engine torque is limited, or fuel system performance issues arise related to temperature sensing.
The complete MX Engine P1168 Code PDF is available in the DiagTechPro manuals library. A free account is required to download this diagnostic service document.
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