P0121 on Your 2022 Dodge Durango: Breaking Down the Evidence
When your 2022 Dodge Durango sets a P0121, the PCM has detected that the throttle position sensor signal is inconsistent with expected patterns. The voltage is in range, but the data doesn't add up—our detective has found evidence that the throttle body isn't communicating reliably with the engine computer.
The 2022 Durango offers the 3.6L Pentastar V6, 5.7L Hemi V8, or the 6.4L SRT Hemi V8. All three use port fuel injection and electronic throttle control. The Durango's role as a three-row SUV means the throttle system handles frequent load changes from passengers, cargo, and optional towing.
Symptoms to Monitor
- Check engine light on
- Hesitation during acceleration from a stop
- Idle fluctuations, especially with A/C running
- Throttle response inconsistency
- MDS transitions rougher than normal (Hemi models)
Causes Ranked by Likelihood
- Carbon buildup on throttle body – PCV vapors deposit carbon on the throttle plate and bore. The Durango's varied load conditions contribute to buildup. Likelihood: 45%
- Throttle body assembly issue – Internal TPS or motor component degradation. Likelihood: 25%
- Wiring or connector corrosion – Engine bay heat and possible moisture intrusion degrade the throttle body connector. Likelihood: 15%
- PCM software calibration – Stellantis has released updates for the Durango's throttle management system. Likelihood: 10%
- Intake system leak – Loose intake duct or cracked PCV hose. Likelihood: 5%
Repair Costs
- Throttle body cleaning: $80–$160 (shop) / $10–$20 (DIY)
- Throttle body replacement: $250–$550 parts and labor
- Wiring repair: $100–$250
- PCM reflash: $100–$180 (dealer)
Check Your Warranty First
Your 2022 Durango may still be under Stellantis's 3-year/36,000-mile basic warranty depending on mileage. The 5-year/60,000-mile powertrain warranty should definitely apply. Contact your Dodge dealer before attempting DIY work. If out of basic warranty, throttle body cleaning is moderate difficulty—the throttle body is accessible on all Durango engines. After cleaning, reset adaptations with a 20–30 minute battery disconnect followed by a 15-minute idle relearn.
How AutoDetective AI Can Help
AutoDetective's AI diagnostic tool analyzes your 2022 Durango's engine variant, mileage, and scan data to differentiate between a simple cleaning job and a throttle body replacement. Get your diagnosis before spending on unnecessary parts.