P0120 on Your 2024 Volvo XC90
A P0120 code on your 2024 XC90 means the ECU has detected a throttle position sensor circuit malfunction. The 2024 XC90 continues on Volvo's SPA platform, available with mild-hybrid B5/B6 powertrains or the T8 plug-in hybrid — all based on Volvo's 2.0L four-cylinder architecture. The electronic throttle body integrates the TPS, and on a vehicle this new under full warranty, the dealer handles this from start to finish.
Symptoms
- Check engine light on
- "Reduced Engine Performance" message
- Power output severely limited
- Throttle feels unresponsive
- Idle instability
Probable Causes
1. Throttle Body Manufacturing Defect
On a low-mileage 2024 model, an internal defect in the throttle body is the leading suspect. The 2.0L engine's throttle body handles the airflow demands of turbocharging (and supercharging on some trims) and must maintain precision tolerances.
2. Software Calibration Update
Volvo may have released ECM updates since your XC90's build date. The mild-hybrid B5/B6 powertrains in particular may need calibration refinements for throttle-electric motor coordination.
3. Connector or Wiring Issue
Assembly-related connector seating or harness routing issues that manifest after initial driving miles.
4. Mild-Hybrid System Interaction
The integrated starter-generator (ISG) on B5/B6 models adds complexity to throttle control. A communication issue between the ISG and throttle system can trigger P0120.
5. Pedal Sensor Defect
A factory-defective accelerator pedal position sensor producing abnormal signals.
Diagnostic Steps
- Volvo dealer scans with VIDA for complete diagnostics
- Check for pending software updates
- Inspect connector seating and wiring
- Review mild-hybrid system communication logs
- Monitor live TPS and APP data
Repair Costs
- All repairs under warranty: $0
- Throttle body replacement (out of pocket): $450–$900
Can I Drive With P0120?
Not safely at highway speeds with this family SUV. Use Volvo On Call roadside assistance for a tow to the dealer. The vehicle should not be driven with reduced power in traffic.
DIY vs Professional
Dealer only. Your 2024 XC90 is under Volvo's 4-year/50,000-mile warranty. All repairs are covered at no cost. Volvo On Call can arrange the tow and schedule the service appointment.
Frequently Asked Questions
Is my 2024 XC90 under warranty?
Yes. Volvo's 4-year/50,000-mile new vehicle warranty covers all throttle system components at no cost.
Does the mild-hybrid system complicate this repair?
The mild-hybrid ISG adds a layer of complexity to throttle control, but the dealer has the tools and training to diagnose and repair it. This doesn't make the repair more expensive under warranty.
Will Volvo provide a loaner?
Most Volvo dealers offer loaner vehicles for warranty repairs. Contact your dealer to arrange one.
Is the XC90 being replaced soon?
Volvo has introduced the EX90 as an electric successor, but the XC90 continues in production with full warranty support, parts availability, and dealer service.