Throttle/Pedal Position Sensor A Range/Performance
The KUBOTA-P0121 (Kubota) diesel fault code means: Throttle/Pedal Position Sensor A Range/Performance. This is a serious severity code.
Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.
- Keep driving?
- Limp mode only
- DIY difficulty
- intermediate
- Estimated cost
- $90-$260 sensor/lever
What Are the Symptoms of KUBOTA-P0121?
- Engine goes to idle
- Derated
What Causes KUBOTA-P0121? (Most Likely First)
- Worn hand-throttle pot (M-series lever) Likely
- Pedal pivot binding / debris Likely
Can I Still Drive with KUBOTA-P0121?
Limp mode only. KUBOTA-P0121 is rated serious severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
What is Kubota code P0121?
Kubota P0121 means: Throttle/Pedal Position Sensor A Range/Performance. Serious code -- address promptly to avoid inducement / further damage.
Can I keep using my Kubota with P0121?
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 P0121 cost to fix on a Kubota?
Repair cost range: $90-$260 sensor/lever. Compact-tractor labor is typically $110-$150/hr in 2026.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose KUBOTA-P0121?
Watch APP1/APP2 live in Diagmaster while sweeping.
Clean pedal pivot; replace lever pot.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P0121 as a generic OBD-II code)
P0121 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Which Vehicles Commonly Get KUBOTA-P0121?
- Kubota M4-071 / M4-072 utility tractors
- Kubota M5-091 / M5-111 utility tractors
- Kubota M6S-111 tractors
- Kubota M7-132 / M7-152 / M7-172 premium tractors
- Kubota MX4800 / MX5400 / MX5800 / MX6000 utility tractors
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