PACCAR MX P0197 is the fault code page for “Oil temperature – Voltage too low or short circuit to ground on ECU D420 pin C16” in the 2013 PACCAR MX Diagnostic Service Manual. PACCAR publishes it for engines in the EPA 2013 emissions family, and it is worked with the DAVIE diagnostic software.
What this fault code means
Oil temperature is measured by sensor F808 in the oil module before the oil cooler, and the manual names one system effect: limitation of engine torque when the oil temperature is too high.
Set and reset conditions
The code sets when the PCI detects sensor output voltage below 0.26 V, and it changes to inactive immediately after the diagnostic runs and passes. A hard short to ground on the signal wire will hold it active.
PACCAR MX P0197 wiring and technical data
The signal and ground circuits land on connector D420.C, and the printed resistance table covers -20 C through 120 C so the sensor can be judged at any workshop temperature. The fault code information block records it as 1 trip MIL, 3 drive cycle recovery, readiness group none, freeze frame type Comprehensive.
| D420 pin | F808 pin | Function |
|---|---|---|
| C16 | 1 | Signal, oil temperature |
| C15 | 2 | Ground |
| – | 1 to 2 | 585 to 604 ohm at 60 C |
Possible causes and working notes
- Faulty wiring
- Faulty connector
- Faulty sensor
Start with a visual inspection of the connectors and harness for bent, broken, corroded or loose pins, then work the steps in order. Back probing is discouraged because it can damage the harness, so fit a breakout harness before you measure.
Document details and format
| Field | Value |
|---|---|
| Brand | PACCAR |
| System group | DTCs, MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Manual page | 186 |
| Pages | 4 |
| File size | 0.6 MB |
| Format | PDF, English |
Applies to PACCAR MX P0197 repairs
The page sits in the DTCs section for MX engines built to the EPA 2013 emissions standard, so it covers trucks running that engine family with the PCI engine control unit. Coverage and dealer support are published on the PACCAR corporate site.
Who needs this PACCAR MX P0197 page
Technicians tracing a shorted oil temperature signal on a PACCAR MX engine who want the pin, the threshold and the inspection order in one place.
The full PDF page is in the DiagTechPro manuals library; a free account downloads it. Keep the PACCAR MX P0197 sheet open next to DAVIE.
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