Decoding P0120 on Your 2022 Infiniti QX60
When your 2022 QX60's check engine light comes on and the V6 feels like it's running on half its cylinders, the clues point to P0120 — a throttle position sensor circuit malfunction. The completely redesigned 2022 QX60 runs a 3.5L V6 (VQ35DD) on Nissan's new platform, paired with a 9-speed automatic. The electronic throttle body integrates the TPS into the assembly, and Nissan/Infiniti refers to the throttle body as the "Electronic Throttle Control Actuator." When the ECU receives voltage outside the expected range, it activates failsafe measures.
Evidence of the Problem
- Check engine light illuminated (MIL)
- Reduced engine power or limp mode
- Throttle response sluggish or unresponsive
- Idle speed erratic — hunting or surging
- Engine may stall at stops
- Possible VDC (Vehicle Dynamic Control) warning
Ranked Suspects
1. Electronic Throttle Control Actuator Failure
The Hitachi/Nissan electronic throttle body on the VQ35DD can develop internal sensor issues. The TPS potentiometer wears over time, producing voltage dropouts or spikes that trigger P0120. Nissan uses an integrated unit — the sensor cannot be replaced independently.
2. Carbon Deposits on Throttle Body
The VQ35DD direct-injection engine produces crankcase vapors that coat the throttle bore. Carbon buildup at typical 2022 mileage levels can impede throttle plate movement and distort TPS readings.
3. Harness or Connector Corrosion
The throttle body connector on the QX60 is located in an area exposed to engine heat and potential moisture intrusion. Corroded pins or degraded wire insulation can cause intermittent P0120.
4. ECM Software Update
As a first-year redesign, the 2022 QX60 has received multiple ECM software updates since launch. A pending calibration may address throttle body adaptation parameters.
5. Accelerator Pedal Sensor
Infiniti's dual-sensor accelerator pedal position sensor can develop wear at commonly used throttle positions, creating signal discrepancies that trigger a TPS circuit code.
Investigation Steps
- Scan with Consult-III+ or quality OBD-II scanner for codes and freeze frame
- Inspect throttle body connector for corrosion or damage
- Check throttle bore for carbon buildup
- Monitor live TPS voltage — should read ~0.5V at idle, sweep to ~4.5V at WOT
- Check for Infiniti TSBs on 2022 QX60 throttle issues
Cost Breakdown
- Throttle body replacement (OEM): $400–$800
- Throttle body cleaning: $175–$350
- Wiring/connector repair: $150–$400
- ECM software update: $150–$250
- Accelerator pedal sensor: $175–$400
Can I Drive With P0120?
In failsafe mode, the QX60's power is severely limited. Do not attempt highway driving or carry a full load of passengers in this condition. Check your warranty — the 2022 QX60 has Infiniti's 4-year/60,000-mile basic warranty, which is more generous than many competitors. Have it towed to an Infiniti dealer.
DIY vs Professional
Check warranty status first — the 4-year/60,000-mile coverage may still apply. Out of warranty, the throttle body on the VQ35DD is accessible but requires proper idle air volume learning after replacement (a procedure that needs Consult-III+ or equivalent tool). Most owners will prefer an Infiniti dealer or Nissan specialist for this work.
Frequently Asked Questions
Is the 2022 QX60 a redesigned model?
Yes. The 2022 QX60 was a complete redesign with a new platform, new 3.5L VQ35DD engine, and new 9-speed automatic transmission. It's mechanically distinct from the previous-generation QX60.
Does the QX60 share its throttle body with other Nissan vehicles?
The VQ35DD engine is used across several Nissan/Infiniti models including the Pathfinder. The throttle body may be shared with vehicles using the same engine.
What is Infiniti's warranty coverage?
Infiniti provides a 4-year/60,000-mile basic warranty and 6-year/70,000-mile powertrain warranty — more generous than many luxury competitors. Throttle system repairs are covered under the basic warranty.
Is P0120 related to the QX60's CVT transmission?
No. The 2022 QX60 replaced the CVT with a 9-speed automatic. P0120 is purely an engine throttle system code, not transmission-related.