P0122 on Your 2022 Honda Civic: A Circuit Failure
When your 2022 Honda Civic sets a P0122, the ECM has detected that the throttle position sensor voltage has fallen below the minimum acceptable level—around 0.2V. This isn't a sensor reading an erratic signal; it's a signal that has dropped out or shorted. Our detective has discovered that a critical communication line has gone dark.
The 2022 Civic (11th generation, first year) uses a 2.0L naturally aspirated four-cylinder or 1.5L VTEC turbo with direct injection. The electronic throttle body's integrated TPS sends a 0.5V–4.5V signal to the ECM; P0122 means the signal has fallen below approximately 0.2V.
Symptoms
- Check engine light on, possibly flashing
- Severe or complete loss of throttle response
- Engine may idle but refuse to accelerate
- Harsh limp mode
- Possible engine stalling
This Is an Electrical Issue
- Throttle body connector damage – Corroded, bent, or loose pins dropping the signal voltage. Likelihood: 35%
- Internal throttle body TPS failure – Sensor short to ground or open circuit within the unit. Likelihood: 30%
- Wiring damage – Chafed, cut, or pinched wire in the TPS circuit. Likelihood: 20%
- 5V reference circuit issue – Shared reference voltage pulled low by another sensor fault. Likelihood: 10%
- Water or moisture intrusion – Connector contamination from engine washing or flooding. Likelihood: 5%
Repair Costs
- Connector repair: $50–$150
- Throttle body replacement: $300–$500 parts and labor
- Wiring repair: $150–$350
- ECM diagnosis: $200–$500+
Get It Fixed Now
Your 2022 Civic may still be within Honda's 3-year/36,000-mile basic warranty depending on purchase date. The 5-year/60,000-mile powertrain warranty should apply. P0122 is a safety concern—don't delay. The dealer will use HDS to measure TPS1 and TPS2 voltages, check the 5V reference signal, and inspect the ground circuit for faults.
How AutoDetective AI Can Help
AutoDetective's AI distinguishes P0122 circuit faults from P0121 performance issues. Upload your scan data for a free targeted diagnosis.