What Does P0121 Mean on a 2022 Jeep Compass?
A P0121 code on your 2022 Jeep Compass indicates the PCM has detected that the throttle position sensor (TPS) signal is behaving outside expected patterns. The voltage is within range, but the way it tracks with your accelerator pedal input isn't matching the PCM's predictions. Your Compass has flagged a clue in the throttle system worth investigating.
The 2022 Compass features the 2.4L Tigershark four-cylinder engine with port fuel injection. This compact crossover uses electronic throttle control with the TPS integrated into the throttle body. Port injection helps keep the throttle body cleaner, but at 2-4 years of age, carbon deposits can start affecting operation, especially with primarily city driving.
Top Causes of P0121 on the 2022 Compass
- Carbon buildup on throttle plate – The leading cause, particularly with stop-and-go city driving. Likelihood: 40%
- Throttle body assembly issue – Internal TPS fault or early wear. Likelihood: 25%
- PCM software calibration – A dealer reflash may resolve the issue. Likelihood: 15%
- Connector or wiring problem – Corrosion or loose pins. Likelihood: 15%
- Intake vacuum leak – Loose boot or deteriorated gasket. Likelihood: 5%
Symptoms You May Notice
- Check Engine Light on
- Rough or unstable idle
- Hesitation when pressing the gas
- Reduced power (especially noticeable on the 2.4L)
- Cruise control may not engage
- Reduced fuel economy
How Serious Is This Code?
P0121 is medium severity. Your 2022 Compass will keep running, but the 2.4L Tigershark already produces modest power—any throttle issue is immediately noticeable. Address it soon—within 1-2 weeks.
Diagnostic Steps
- Scan for codes and review freeze frame data
- Inspect throttle body for carbon deposits
- Monitor TPS voltage: ~0.5V idle, smooth sweep to ~4.5V WOT
- Check throttle body connector for corrosion and secure fit
- Inspect wiring harness for damage
- Check for vacuum leaks around the intake
Estimated Repair Costs
- Throttle body cleaning: $100–$200 (DIY: $10–$20)
- Throttle body replacement: $300–$500
- Wiring repair: $150–$300
- PCM reflash: $100–$150 at dealer
Can You DIY This Fix?
DIY feasibility is moderate. The Compass's compact engine bay is a bit tighter than larger Jeeps, but the throttle body is still accessible. Use dedicated throttle body cleaner. After cleaning, disconnect the battery for 15-20 minutes, reconnect, start, and idle 10 minutes for the relearn.
Check warranty first—the 2022 Compass may still be under Stellantis' 3-year/36,000-mile basic warranty. The 5-year/60,000-mile powertrain warranty is almost certainly active. If covered, let the dealer handle the repair at no cost.