P0120 Uncovered on Your 2024 Infiniti QX60
Your 2024 QX60's check engine light has uncovered a throttle position sensor circuit malfunction — code P0120. The QX60 continues with the 3.5L VQ35DD V6 and 9-speed automatic, and the electronic throttle body (which Infiniti calls the Electronic Throttle Control Actuator) integrates the TPS directly. On a vehicle this new and under full warranty, the dealer handles this entirely.
Symptoms
- Check engine light on
- Reduced engine power or failsafe mode
- Sluggish throttle response
- Erratic idle
- VDC light may illuminate
Leading Causes
1. Throttle Body Manufacturing Defect
On a low-mileage 2024 model, an internal defect in the electronic throttle body is the primary suspect. The VQ35DD's throttle body is a precision component where manufacturing tolerances are tight.
2. ECM Software Calibration
Nissan/Infiniti may have released updated calibrations since your QX60's production date. A software update can recalibrate throttle adaptation parameters.
3. Connector Issue from Assembly
An improperly seated throttle body connector from the factory can cause intermittent signal faults.
4. Wiring Routing Problem
A harness pinched during assembly can develop insulation damage over early driving miles.
5. Pedal Sensor Defect
A factory-defective accelerator pedal position sensor producing conflicting signals.
Diagnostic Steps
- Infiniti dealer scans with Consult-III+ for full diagnostics
- Check for TSBs and software updates for 2024 QX60
- Inspect connector seating and wiring routing
- Monitor live TPS and APP data
- Verify ECM software version
Repair Costs
- All repairs under warranty: $0
- Throttle body replacement (out of pocket): $400–$800
Can I Drive With P0120?
Not in failsafe mode. Contact Infiniti roadside assistance for a tow to the dealer. Do not attempt highway driving with reduced power.
DIY vs Professional
Dealer only. Your 2024 QX60 is under Infiniti's 4-year/60,000-mile basic warranty. All throttle system repairs are handled at no cost. There is no reason to attempt DIY work on a vehicle under warranty.
Frequently Asked Questions
Is P0120 covered under Infiniti warranty?
Yes. The 4-year/60,000-mile basic warranty covers all throttle system components at no cost to you.
Will the dealer provide a loaner?
Most Infiniti dealers offer loaner vehicles for warranty repairs. Arrange one when scheduling your appointment.
How long will the P0120 repair take?
Software updates are same-day. Throttle body replacement is typically 1-2 days depending on parts availability.
Is the QX60 reliable despite this code?
One throttle code does not indicate systemic reliability issues. Electronic component defects occasionally occur on any brand. The warranty handles these situations.