PACCAR MX P0098 is the fault code chapter the 2013 PACCAR MX Diagnostic Service Manual publishes for “Intercooler temperature – Voltage too high or short circuit to supply on ECU D420 pin C17”. The 4-page PDF is PACCAR’s own troubleshooting write-up for EPA2013 MX engines, reproduced exactly as the factory issued it.
Document details and coverage
| Brand | PACCAR |
|---|---|
| Group | DTCs / MX Engines (EPA2013) |
| Fault code | P0098 |
| Fault code information | 1 trip MIL, 3 drive cycle recovery, freeze frame type Comprehensive |
| Source manual | 2013 PACCAR MX Diagnostic Service Manual |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What sets PACCAR MX P0098 active
The diagnostic runs when the sensor output voltage is greater than 4.865 V. The PCI sets the code when it detects that the sensor output voltage is too high, above 4.89 V. The fault code changes to inactive immediately after the diagnostic runs and passes.
Component and wiring checks
- PCI ECU connector D420.C pins C17 (intercooler temperature signal) and C40 (ground) to sensor connector F750 pins 1 and 2
- Sensor resistance from 5248–5732 Ω at 0°C down to 195–199 Ω at 100°C [212°F]
- Five volts between wiring harness pins 1 and 2 with the ignition keyed on
Possible causes and repair notes
- Faulty wiring
- Faulty connector
- Faulty sensor
The intercooler outlet temperature is measured before the EGR mixer and monitors intercooler performance. The steps are worked with a breakout harness where needed and back probing is avoided; if the code stays active after the sensor and harness pass, the manual treats it as a possible PCI failure and refers the case to the Engine Support Center. Company and product background is on the official PACCAR website.
Who needs this PACCAR MX P0098 chapter
Heavy-duty diesel technicians and fleet shops reach for PACCAR MX P0098 when the code lands on a DAVIE scan and the repair has to follow the factory sequence instead of guesswork.
The complete PDF sits in the DiagTechPro manuals library; a free account is required to download it.
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