PACCAR MX P0198 is the fault-code chapter of the 2013 PACCAR MX Diagnostic Service Manual covering oil temperature sensor voltage too high, or a short circuit to supply on PCI ECU D420 pin C16. PACCAR lists it as a one-trip MIL code with three drive cycle recovery and a comprehensive freeze frame. Oil temperature is measured in the oil module before the oil cooler, and engine torque is limited when it runs too high.
Document details at a glance
| Brand | PACCAR |
|---|---|
| Model coverage | PACCAR MX engines, EPA 2013 emissions level |
| System group | DTCs, MX Engines EPA2013 |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual, pages 190 to 193 |
| Pages | 4 |
| File size | 0.5 MB |
| Format | |
| Language | English |
What the PACCAR MX P0198 chapter covers
- Set condition: the PCI detects a sensor output voltage above 4.89 V
- Reset condition: the code goes inactive once the diagnostic runs and passes
- Harness connector views for D420.C and for oil temperature sensor F808
- Pin table linking D420 C15 to ground and D420 C16 to the signal wire
- Sensor resistance values from -20°C to 120°C and the 5 V key-on reading
- Possible causes: faulty wiring, a faulty connector or a faulty sensor
Diagnostic step sequence and verification
Inside PACCAR MX P0198 the procedure runs as follows. Five steps run from a visual inspection, through a key-on voltage measurement at the disconnected sensor, to jumper-wire tests at the engine harness and then at the PCI. Each branch says whether to replace the sensor, replace the engine harness, or call the Engine Support Center about the PCI. Verification is a DAVIE clear followed by an idle run to confirm nothing returns.
Trucks and engines it applies to
The chapter belongs to the EPA 2013 emissions family of PACCAR MX engines fitted to Kenworth and Peterbilt trucks, and it assumes DAVIE software plus a breakout harness, since back probing is not recommended. Model programmes and dealer support for these engines are listed on the PACCAR corporate site.
Who needs the PACCAR MX P0198 chapter
Any technician chasing an oil temperature complaint or an unexplained torque limitation needs this chapter, because it carries the pin numbers, the resistance table and the pass or fail thresholds.
The complete PDF of the PACCAR MX P0198 chapter is filed in the DiagTechPro manuals library, where a free account is required to download it alongside the rest of the MX Engines EPA2013 fault-code set.
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