P0121 on Your 2024 Toyota Tundra
Your 2024 Tundra has flagged P0121 — throttle position sensor range/performance. Running the 3.5L twin-turbo i-FORCE V6 (V35A-FTS) or the i-FORCE MAX hybrid powertrain on the TNGA-F platform, your Tundra's electronic throttle body is reporting TPS data the ECU considers abnormal. On a vehicle this new, software and manufacturing quality are the focus of the investigation.
What You're Experiencing
- Check engine light on
- Throttle response slightly imprecise
- Idle may be marginally unsteady
- 10-speed auto shift timing slightly off
- Possible boost hesitation under light load
Common Causes (Ranked by Likelihood)
1. Software Calibration Update
Toyota continues to refine the twin-turbo V6 calibration. A throttle body adaptation update may be available that resolves P0121 without hardware changes.
2. Throttle Body Unit Variance
An occasional unit with marginal sensor calibration from the factory. Warranty replacement resolves this completely.
3. Electrical Connector Issue
A connector not fully seated during assembly can produce intermittent TPS signal anomalies.
4. Turbo Boost Control Interaction
The twin-turbo system's boost control interacts with throttle body operation. A calibration mismatch between the two systems can trigger TPS performance codes.
5. Wiring Harness Routing
Production routing near heat sources (turbos run very hot) can degrade wiring insulation over time.
Diagnostic Steps
- Toyota dealer scans with Techstream
- Check for TSBs on the 2024 Tundra throttle system
- Verify connector engagement at throttle body
- Monitor TPS and boost data simultaneously
- Check for ECU software updates
Repair Costs
- All repairs under warranty: $0
- Software update (out of pocket): $100–$200
- Throttle body replacement (out of pocket): $400–$700
Can I Drive With P0121?
Yes for daily driving. Avoid heavy towing until resolved. Schedule a dealer visit within a week or two.
DIY vs Professional
Your 2024 Tundra is under Toyota's 3-year/36,000-mile warranty. Take it to the dealer — the repair is free. Do not attempt DIY on a turbocharged vehicle under warranty.
Frequently Asked Questions
Does P0121 affect the i-FORCE MAX hybrid system?
The hybrid motor-generator can compensate for some throttle inconsistencies. P0121 may affect the smoothness of transitions between electric and gas power, but the hybrid system is still functional.
Will P0121 affect my Tundra's payload rating?
Not mechanically, but imprecise throttle data can affect the 10-speed's shift behavior under heavy loads. Resolve before hauling at capacity.
Is the twin-turbo V6 as reliable as the old V8?
The V35A-FTS is too new for definitive long-term data, but early indications are positive. Software-related P0121 on a new engine doesn't indicate a reliability problem.
How long does the warranty repair take?
Software updates take a few hours. Throttle body replacement is typically same-day if the part is available.