What Does P0121 Mean on a 2022 Chevrolet Camaro?
The P0121 investigation on your 2022 Chevrolet Camaro uncovers evidence that the throttle position sensor (TPS) is transmitting voltage within normal range but with an abnormal performance signature. The ECM calculates what throttle position should be based on driver input and other sensor data—and finds the TPS reading doesn't match.
Your 2022 Camaro is built on GM's Alpha platform with engine options including the 2.0L turbo-four (275 hp), 3.6L V6 (335 hp), 6.2L LT1 V8 (455 hp), and the supercharged 6.2L LT4 V8 (650 hp in ZL1). All use electronic throttle control with the TPS integrated into the throttle body. For a sports car, accurate throttle position data is non-negotiable for performance and safety.
Common Symptoms to Watch For
- Check engine light or Reduced Engine Power warning
- Hesitation during acceleration or throttle tip-in
- Rough idle or idle fluctuation
- Inconsistent throttle response in different drive modes
- Performance Traction Management may not function as expected
- Rev-matching on manual transmission models may misfire
Top Causes Ranked by Likelihood
- Carbon buildup on throttle body (35%) – The 2.0L turbo's direct-injection-only design is most susceptible. The V6 and V8 engines use dual injection, which helps but doesn't prevent all deposits. Cost: $150–$350.
- Throttle body assembly failure (25%) – Internal TPS element wear or defect, especially on high-performance engines subjected to aggressive driving. Cost: $0 under warranty; $300–$600 otherwise.
- Wiring or connector issue (20%) – Engine bay heat and vibration, particularly on V8 models, can stress the throttle body electrical connection. Cost: $0 under warranty; $100–$300 otherwise.
- ECM software calibration (15%) – An available update or calibration refinement. Particularly relevant if aftermarket modifications are present. Cost: $0 under warranty; $120–$180 otherwise.
- Boost or intake leak (5%) – On the 2.0L turbo or ZL1's supercharged intake, a pressurized air leak creates data conflicts. Cost: $100–$350.
How Serious Is This Code?
P0121 is medium severity overall, but on a performance car it demands prompt attention. Unpredictable throttle response at speed, during cornering, or in heavy traffic is a real safety concern. Fix this soon.
Diagnostic Path
Use a quality scan tool to monitor live TPS voltage during controlled throttle sweeps. The Alpha platform's electronic throttle body should produce a smooth, linear voltage increase from 0.5V (closed) to 4.5V (wide-open). Any deviation is significant on a performance application.
Check for aftermarket tunes or modifications that may affect throttle calibration. Inspect the throttle body for carbon and the harness for heat damage. On the ZL1, check the supercharger bypass valve and intercooler system for leaks that could affect intake pressure readings.
Can You Fix This Yourself?
Your 2022 Camaro may still be within GM's 3yr/36k bumper-to-bumper warranty—check your purchase date and mileage. The 5yr/60k powertrain warranty is almost certainly active. Use your warranty coverage first. If out of warranty, DIY throttle body cleaning is moderate difficulty on all engines. The relearn procedure requires a GM-compatible scan tool or battery disconnect method.
Get a Free AI Diagnosis
Performance matters—get the right diagnosis. Enter your 2022 Camaro's engine, mileage, and symptoms into AutoDetective's free AI tool for a precision diagnosis.