What P0121 Means for Your 2022 Dodge Challenger
A P0121 code on your 2022 Dodge Challenger indicates the PCM has flagged an irregular throttle position sensor signal pattern. The voltage is within expected bounds but doesn't correlate properly with your pedal input—like a detective's evidence that passes initial review but falls apart under closer examination. The electronic throttle body needs a thorough inspection.
The 2022 Challenger powers on with the 3.6L Pentastar V6, 5.7L Hemi V8, 6.4L SRT Hemi, or supercharged Hellcat variants. All use port injection and Stellantis drive-by-wire throttle control. The TPS is integrated into the throttle body and communicates through dual signal circuits for redundancy.
Symptoms You'll Detect
- Check engine light on
- Hesitation or stumble on acceleration
- Rough or unsteady idle
- Momentary loss of throttle response
- Rough MDS cylinder deactivation transitions (Hemi engines)
Causes by Probability
- Carbon buildup on throttle body – PCV system vapors deposit carbon on the throttle plate and bore. Even at moderate mileage, this is the most frequent cause. Likelihood: 45%
- Throttle body assembly failure – Internal sensor or motor degradation within the electronic throttle body. Likelihood: 25%
- Wiring or connector issue – Heat from the engine and exhaust can degrade connectors over time. Likelihood: 15%
- PCM software update – Stellantis has released recalibrations for the late-model LX platform throttle management. Likelihood: 10%
- Air intake leak – Loose air filter housing or cracked intake boot. Likelihood: 5%
Repair Costs
- Throttle body cleaning: $80–$150 (shop) / $10–$20 (DIY)
- Throttle body replacement: $250–$550 parts and labor
- Wiring repair: $100–$250
- PCM reflash: $100–$180 (dealer)
Warranty & DIY
Your 2022 Challenger should still be within Stellantis's 3-year/36,000-mile basic warranty (check your purchase date) and the 5-year/60,000-mile powertrain warranty. If covered, let the dealer handle it via wiTECH diagnostics. If out of basic warranty, throttle body cleaning is a high-feasibility DIY task. After cleaning, disconnect the battery for 20–30 minutes, reconnect, and idle for 15 minutes to reset throttle adaptations.
How AutoDetective AI Can Help
Upload your OBD-II data to AutoDetective for an AI-driven analysis specific to your 2022 Challenger's engine and mileage. Our system differentiates between carbon buildup and sensor failure to guide your next step.