P0120 Surfaces on Your 2024 Audi A6
Seeing P0120 on a nearly new 2024 A6 is alarming — and rightfully so. This code means the ECU has detected a malfunction in the throttle position sensor circuit, a critical part of your C8-generation A6's drive-by-wire throttle system. The 2024 A6 runs the 2.0T EA888 Evo with a Bosch integrated electronic throttle body, and any circuit fault here triggers immediate limp mode protection. The trail of evidence on a low-mileage vehicle like this typically leads to manufacturing or software issues rather than wear.
What You'll Notice
- EPC warning light plus check engine light
- Immediate limp mode — power cut drastically
- Throttle pedal may feel dead or unresponsive
- Idle may hunt or fluctuate
- Possible complete stall when stopping
Most Likely Causes
1. Throttle Body Manufacturing Defect
On a vehicle this new, an internal defect in the Bosch throttle body — faulty potentiometer, weak motor winding, or contamination from manufacturing — is the primary suspect. This is a warranty repair.
2. ECU Software Issue
Audi frequently releases post-production software updates. A throttle adaptation or calibration update may not have been applied at the factory or during pre-delivery inspection.
3. Connector Seating Issue
If the throttle body connector wasn't fully seated during assembly, vibration during driving can cause intermittent contact loss and trigger P0120.
4. Wiring Harness Pinch
During engine assembly, wiring can be routed too close to sharp edges or pinch points. This can damage insulation over time and cause short circuits in the TPS wiring.
5. Pedal Position Sensor Fault
The dual APP sensors in the accelerator pedal assembly rarely fail on new vehicles, but a defective unit can produce signals that the ECU flags as a TPS circuit malfunction.
Diagnostic Steps
- Dealer scans with ODIS for complete fault memory and pending software updates
- Check for open recalls or TSBs on the 2024 A6 throttle system
- Inspect throttle body connector for proper seating
- Review live data for TPS voltage consistency during throttle sweep
- Verify wiring harness routing for pinch points near engine mounts
Repair Costs
- All repairs under warranty: $0
- Throttle body replacement (if out of pocket): $500–$950
- Software flash: $0 under warranty, $150–$250 otherwise
- Connector/wiring repair: $0 under warranty, $150–$350 otherwise
Can I Drive With P0120?
Only to the nearest Audi dealer at low speed. Limp mode limits your speed but the underlying throttle fault is unpredictable. Use Audi roadside assistance (included with your new vehicle warranty) for a tow if the dealer isn't close by.
DIY vs Professional
Do not attempt any DIY repairs on your 2024 A6. The vehicle is fully covered under Audi's 4-year/50,000-mile warranty. Contact your dealer, describe the EPC light and limp mode condition, and they'll prioritize the service appointment as a drivability concern.
Frequently Asked Questions
Should I be worried about P0120 on a new Audi A6?
It's concerning because throttle control is safety-critical, but on a new vehicle under warranty, the dealer will resolve it at no cost. Manufacturing defects happen occasionally and are exactly what the warranty covers.
Will Audi provide a loaner car for P0120 repair?
Most Audi dealers offer loaner vehicles for warranty repairs. Call ahead to arrange one when scheduling your service appointment.
How long will the P0120 repair take?
A software update takes a few hours. Throttle body replacement is typically same-day if the part is in stock, or 1-3 days if ordered.
Can P0120 come back after repair?
If the root cause is properly addressed, P0120 should not return. If it does, the dealer needs to investigate further — possibly checking the wiring harness or ECU itself.