What P0121 Means on a 2024 Dodge Durango
A P0121 code on your 2024 Dodge Durango indicates the PCM has detected an abnormal throttle position sensor signal pattern. The voltage is within range but the behavior is inconsistent—our detective's first clue that something is disrupting the communication between the throttle body and engine computer.
The 2024 Durango continues with the proven 3.6L Pentastar V6 and 5.7L Hemi V8, both using port fuel injection and electronic throttle control. While the platform is mature, a P0121 on a brand-new vehicle typically points to software calibration or manufacturing quality rather than wear-related issues.
What You'll Notice
- Check engine light illuminated
- Possible hesitation on acceleration
- Idle may feel rough or unstable
- Throttle response may feel inconsistent
- MDS may not engage smoothly (Hemi)
Probable Causes for a New Durango
- PCM software calibration – The most likely cause on a new vehicle. Stellantis may have a pending calibration update for the 2024 model year. Likelihood: 35%
- Carbon deposits from short-trip driving – Even new vehicles driven primarily in city traffic can accumulate throttle body deposits quickly. Likelihood: 30%
- Throttle body manufacturing defect – Factory quality issues with the TPS or actuator motor. Likelihood: 20%
- Connector seating issue – Assembly line connector not fully seated or wire routing causing intermittent contact. Likelihood: 10%
- Intake system issue – Factory assembly error in air intake routing or gasket alignment. Likelihood: 5%
Cost to Fix
- All repairs: $0 under warranty
- Out-of-warranty reference: Cleaning $80–$160, replacement $250–$550, PCM flash $100–$180
Dealer Visit Required
Your 2024 Durango is fully covered under Stellantis's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. Take it directly to your Dodge dealer. Do not attempt DIY work on a vehicle under warranty. The dealer will use wiTECH to perform a complete throttle system diagnosis, apply any software updates, and replace hardware if necessary—all at no cost to you.
How AutoDetective AI Can Help
Before your dealer appointment, run your scan data through AutoDetective's AI. We'll give you a preliminary diagnosis so you know what to expect and can have a productive conversation with the service team.