PACCAR MX P0195 is the fault code page for “Oil temperature – Data erratic intermittent or incorrect at ignition on” 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 sensor F808 measures in the oil module before the oil cooler. The manual lists a single system effect: engine torque is limited when the oil temperature is too high.
Set and reset conditions
Like its coolant and fuel counterparts this is an 8-hour soak check. It runs after the ignition has been off at least 8 hours with ambient above -20 C, and sets when the PCI ECU D420 finds the oil reading differs by more than 3 C from the average of the other engine temperature sensors.
PACCAR MX P0195 wiring and technical data
Two circuits run to connector D420.C, and the manual prints the sensor resistance across the full temperature range. The fault code information block records it as 2 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 | 2439 to 2557 ohm at 20 C |
Possible causes and working notes
- Oil temperature sensor deviation
The reset sequence matches the other soak diagnostics: 8 to 10 consecutive hours untouched, then key on without starting for 10 seconds, then a 2 minute idle. With one listed cause, a reading out of step with the other engine sensors is the finding.
Document details and format
| Field | Value |
|---|---|
| Brand | PACCAR |
| System group | DTCs, MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Manual page | 182 |
| Pages | 4 |
| File size | 0.6 MB |
| Format | PDF, English |
Applies to PACCAR MX P0195 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 P0195 page
Shops verifying an oil temperature sensor repair on a PACCAR MX engine who need to know the check will not run until the truck has sat overnight.
The full PDF page is in the DiagTechPro manuals library; a free account downloads it. Keep the PACCAR MX P0195 sheet open next to DAVIE.
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