Reductant Pressure Sensor High Input
The KUBOTA-P204D (Kubota) diesel fault code means: Reductant Pressure Sensor High Input. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $100-$400 line, $350-$900 doser
A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- MIL on
Probable Causes (Ranked by Likelihood)
- Blocked DEF line downstream of pump Likely
- Frozen doser Possible
Step-by-Step Diagnostic Procedure
Inspect for kinked DEF line.
Warm system and re-test.
Frequently Asked Questions
What is Kubota code P204D?
Kubota P204D means: Reductant Pressure Sensor High Input. Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my Kubota with P204D?
Serious fault -- you can move the machine to a shop but don't run it under load. Use Kubota Diagmaster software (dealer tool) for full diagnostics.
How much does P204D cost to fix on a Kubota?
Repair cost range: $100-$400 line, $350-$900 doser. Compact-tractor labor is typically $110-$150/hr in 2026.