P0121 on Your 2022 Volvo XC90: The Investigation
A P0121 on your 2022 Volvo XC90 means the ECM has detected irregular throttle position sensor behavior. The TPS voltage is within range but the signal pattern doesn't match your pedal inputs—our detective has found a discrepancy in the throttle body communication that needs resolution.
The 2022 XC90 rides on Volvo's SPA platform with the Drive-E 2.0L four-cylinder in various configurations: B5 (turbo, 247 hp), B6 (turbo + supercharger, 295 hp), or T8 Recharge (turbo + supercharger + electric, 455 hp combined). All variants use direct injection and electronic throttle control. The forced-induction configurations demand precise throttle management for coordinating boost sources.
Symptoms
- Check engine light on
- Hesitation during acceleration
- Idle roughness, especially noticeable in this quiet cabin
- Turbo/supercharger transitions feel rough
- T8: hybrid-to-gas transitions may feel jerky
Causes Ranked
- Carbon buildup on throttle body – The 2.0L DI engine is susceptible to carbon deposits. The supercharged variants (B6/T8) push more air through the throttle body, amplifying deposit effects. Likelihood: 45%
- Throttle body assembly wear – Internal TPS or motor degradation. Likelihood: 25%
- ECM software update – Volvo regularly releases calibration updates through VIDA for the SPA platform. Likelihood: 15%
- Wiring or connector issue – Engine bay heat from turbo and supercharger affects connectors. Likelihood: 10%
- Supercharger/boost coordination – B6/T8 models: issue with supercharger clutch or boost handoff affecting throttle body readings. Likelihood: 5%
Repair Costs
- Throttle body cleaning: $120–$200 (shop) / $10–$25 (DIY)
- Throttle body replacement: $400–$700 parts and labor
- ECM update via VIDA: $100–$250 (dealer)
- Wiring repair: $100–$300
Warranty
Your 2022 XC90 should be within Volvo's 4-year/50,000-mile bumper-to-bumper warranty depending on mileage. Volvo dealers use VIDA diagnostic software for complete throttle system analysis and software updates. If out of warranty, a Volvo-specialist independent shop with VIDA access is a good alternative.
How AutoDetective AI Can Help
AutoDetective's AI differentiates between the XC90's B5, B6, and T8 powertrains to rank causes specific to your configuration. Upload your scan data for a free diagnosis.