What P0122 Means on a 2024 Honda Accord
A P0122 on your 2024 Honda Accord is a circuit-level throttle system fault. The ECM has detected that the throttle position sensor voltage has dropped below the minimum threshold (~0.2V). This is not a performance issue—it's a signal failure. Our detective has discovered that a critical data link between the throttle body and ECM has broken down.
The 2024 Accord (11th generation) uses a 1.5L VTEC turbo (192 hp) or a 2.0L hybrid powertrain. Both feature electronic throttle control with integrated TPS. On a vehicle this new, manufacturing defects and assembly issues are the primary suspects.
Symptoms
- Check engine light on
- Severe loss of throttle response
- Engine may default to idle-only mode
- Harsh limp mode
- Possible stalling
Causes on a New Vehicle
- Throttle body assembly defect – Factory fault in the TPS sensor causing internal short or open. Likelihood: 35%
- Connector seating issue – Assembly line connector not fully seated or damaged during manufacturing. Likelihood: 30%
- Wiring routing problem – Factory wire routing causing pinch or chafe. Likelihood: 20%
- ECM reference voltage fault – 5V reference circuit issue at the ECM level. Likelihood: 10%
- Water intrusion – Moisture contamination from road spray or engine washing. Likelihood: 5%
Cost
- All repairs: $0 under warranty
- Out-of-warranty reference: Connector repair $50–$150, throttle body $300–$550, wiring $150–$350
Dealer Visit: Immediately
Your 2024 Accord is fully covered under Honda's 3-year/36,000-mile basic and 5-year/60,000-mile powertrain warranties. P0122 is a safety concern due to potential throttle failure. Take it to the dealer urgently—do not attempt DIY. The dealer uses HDS to verify TPS circuit voltage, reference signal, and ground integrity.
How AutoDetective AI Can Help
Upload your scan data to AutoDetective for a free circuit-fault-specific diagnosis before your dealer appointment.