What Does P0121 Mean on a 2022 Chevrolet Traverse?
A P0121 code on your 2022 Chevrolet Traverse means the throttle position sensor (TPS) is operating within the expected voltage range but generating an abnormal signal pattern. Our diagnostic investigators found that the ECM sees TPS readings that don't match its calculations based on accelerator pedal position, engine airflow, and load data.
Your 2022 Traverse rides on the C1XX platform with the 3.6L V6 (310 hp) and 9-speed automatic transmission. The engine uses dual injection (direct + port) and electronic throttle control with the TPS built into the throttle body assembly. This is a mature platform with well-refined calibrations, so any P0121 on this model year typically points to a physical rather than software issue.
Common Symptoms to Watch For
- Check engine light on
- Hesitation during acceleration, especially loaded with passengers
- Rough or hunting idle
- Reduced power during highway merging
- 9-speed automatic shifting feels off
- Fuel economy slightly decreased
Top Causes Ranked by Likelihood
- Carbon buildup on throttle body (40%) – Even with dual injection, PCV gases deposit carbon on the throttle bore and plate over time. At 2-4 years old, early buildup is possible with short-trip driving patterns. Cost: $150–$300.
- Throttle body assembly failure (25%) – Internal TPS wear or defect causing dead spots or erratic voltage. Cost: $0 under warranty; $300–$500 otherwise.
- Wiring or connector issue (20%) – Corrosion, loose pins, or chafing in the throttle body harness. Cost: $0 under warranty; $100–$250 otherwise.
- ECM software calibration (10%) – An available update that hasn't been applied. Cost: $0 under warranty; $120–$180 otherwise.
- Intake manifold gasket leak (5%) – A minor gasket issue creating an airflow discrepancy. Cost: $0 under warranty; $200–$400 otherwise.
How Serious Is This Code?
P0121 is medium severity. Your Traverse should remain drivable, but as a family vehicle often loaded with passengers, predictable throttle response is important for safe driving. Address this soon—within a week.
Diagnostic Path
Check warranty coverage first—your 2022 Traverse may still be within the 3yr/36k bumper-to-bumper warranty. If so, let the dealer diagnose with GDS2. If checking yourself, monitor TPS voltage during slow throttle sweeps with a scan tool. Look for dead spots, dropouts, or erratic readings.
Inspect the throttle body for carbon deposits and the connector for corrosion. On the 3.6L V6, the throttle body is easily visible from the top of the engine bay.
Can You Fix This Yourself?
Check your warranty status first. If the 3yr/36k warranty still applies, take it to the dealer. The 5yr/60k powertrain warranty also covers engine management components. If out of warranty, throttle body cleaning is a moderate DIY job—the 3.6L's throttle body is accessible and the cleaning process is straightforward.
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