Investigating P0120 on Your 2022 Mitsubishi Eclipse Cross
When your 2022 Eclipse Cross loses power and the check engine light turns on, the evidence trail leads to P0120 — a throttle position sensor circuit malfunction. The Eclipse Cross uses a 1.5L turbocharged four-cylinder engine (MIVEC turbo) paired with a CVT. The electronic throttle body integrates the TPS, and when the ECU detects abnormal circuit voltage, it limits engine output to protect the drivetrain.
Symptoms
- Check engine light on
- Reduced engine power
- Throttle response delayed or erratic
- Rough or fluctuating idle
- Possible stalling
- S-AWC warnings may appear
Top Suspects
1. Throttle Body Failure
The electronic throttle body on the 1.5T engine is a compact unit handling turbo airflow. Internal TPS wear or motor degradation produces out-of-range voltage signals. The TPS is integrated and not separately replaceable.
2. Carbon Deposits
The direct-injection turbocharged 1.5L engine generates crankcase vapors that coat the throttle bore. At typical 2022 mileage, carbon buildup can impede throttle operation and corrupt TPS readings.
3. Wiring or Connector Issue
The compact engine bay of the Eclipse Cross places the throttle body near the turbocharger. Heat exposure can degrade connector integrity and wiring insulation.
4. ECM Software Update
Mitsubishi may have released ECM calibration updates for the 1.5T powertrain. A pending update can resolve software-related P0120 codes.
5. Pedal Position Sensor
The dual APP sensor pedal can develop wear, producing signals that conflict with throttle body feedback.
Diagnostic Steps
- Scan for codes and freeze frame data
- Inspect throttle body connector for heat damage
- Check throttle bore for carbon deposits
- Monitor live TPS voltage during throttle sweep
- Check for Mitsubishi TSBs on Eclipse Cross throttle system
Cost Breakdown
- Throttle body replacement: $225–$475
- Throttle body cleaning: $100–$250
- Wiring repair: $100–$300
- ECM software update: $100–$200
- Pedal sensor: $125–$275
Can I Drive With P0120?
Only at low speed to a shop. Do not drive at highway speeds with reduced power. Your 2022 Eclipse Cross should be within Mitsubishi's 5-year/60,000-mile basic warranty. Have it towed to the dealer.
DIY vs Professional
Check warranty — the 5-year/60,000-mile coverage should apply. Out of warranty, the 1.5T's throttle body is accessible and replacement is straightforward. Carbon cleaning is a good first DIY step. The Eclipse Cross is one of the more affordable vehicles to repair for throttle body issues.
Frequently Asked Questions
Is P0120 common on the Eclipse Cross?
Not particularly common, but the 1.5T direct-injection engine is susceptible to carbon buildup on the throttle body over time. Regular cleaning prevents most P0120 occurrences.
What is Mitsubishi's warranty on the Eclipse Cross?
5-year/60,000-mile basic warranty and 10-year/100,000-mile powertrain warranty. Throttle body repairs fall under the basic warranty.
Is the Eclipse Cross being discontinued?
The Eclipse Cross has been discontinued in some markets. However, your 2022 model is fully supported with warranty coverage, parts, and dealer service for the duration of the warranty period.
Can carbon cleaning prevent P0120?
Yes. Periodic throttle body cleaning every 30,000–40,000 miles helps prevent carbon-related TPS issues. This is especially important on the direct-injection 1.5T engine.