What Does P0121 Mean on a 2024 Chevrolet Traverse?
A P0121 code on your 2024 Chevrolet Traverse tells our diagnostic investigators that the throttle position sensor (TPS) is transmitting voltage within the expected range but with an abnormal performance pattern. The ECM compares TPS data against accelerator pedal position, airflow, and engine load—and finds the readings don't add up.
The 2024 Traverse is a completely redesigned model, now built on GM's new platform with a 2.5L turbocharged four-cylinder engine (328 hp) replacing the previous 3.6L V6. This significant powertrain change means new throttle body hardware and calibrations. As a first-year redesign, calibration-related codes are more likely than on mature platforms.
Common Symptoms to Watch For
- Check engine light illuminated
- Hesitation during acceleration
- Rough or unstable idle
- Reduced throttle response when loaded with passengers
- Transmission may shift at unexpected points
- Stop/Start system may behave erratically
Top Causes Ranked by Likelihood
- ECM software calibration (35%) – As a completely new platform and engine, the 2024 Traverse may need software refinements. First-year calibration updates are common on redesigned vehicles. Cost: $0 under warranty.
- Throttle body manufacturing defect (30%) – New production components carry higher variability risk. An internal TPS defect can cause abnormal voltage patterns. Cost: $0 under warranty.
- Wiring or connector assembly defect (20%) – New wiring harness designs may have unforeseen issues at connector crimps or routing. Cost: $0 under warranty.
- Carbon buildup on throttle body (10%) – The new 2.5L turbo uses direct injection, which can produce deposits even at low mileage, especially with short-trip driving. Cost: $150–$300 if not warranty-covered.
- Intake system leak (5%) – A loose factory clamp or gasket issue in the turbocharged intake tract. Cost: $0 under warranty.
How Serious Is This Code?
P0121 is medium severity. Your Traverse should remain drivable, but as a new family vehicle, any driveability issue should be addressed promptly. Schedule a dealer appointment soon—this is a warranty repair.
Diagnostic Path
Take your 2024 Traverse directly to a Chevrolet dealer. They'll use GDS2 to read live TPS data, check for related codes, verify ECM software version, and search for TSBs applicable to your build date. On a brand-new redesigned vehicle, the dealer has the best diagnostic resources.
Can You Fix This Yourself?
Your 2024 Traverse is fully covered under GM's 3yr/36k bumper-to-bumper warranty and 5yr/60k powertrain warranty. Take it to the dealer—all work is free. Do not attempt DIY repairs on a vehicle under active warranty coverage.
Get a Free AI Diagnosis
Going to the dealer? Get informed first. AutoDetective's free AI diagnosis can analyze your 2024 Traverse's symptoms and provide talking points for your service appointment.