What Does P0122 Mean on a 2024 Toyota Camry?
If your 2024 Toyota Camry has stored code P0122, the Engine Control Module has detected a Throttle Position Sensor A circuit voltage reading below the minimum acceptable threshold — approximately 0.2 volts, compared to the normal sweep range of 0.5 to 4.5 volts. This is not a soft performance fault. It is a hard circuit failure that eliminates the ECM's ability to read throttle position, triggering an immediate protective response.
The 2024 Camry represents the final model year offering a conventional ICE-only powertrain option alongside its hybrid variant — the 2025 Camry transitions to hybrid-only. The 9th generation Camry (launched 2024, TNGA-K platform) comes with a 2.5L Dynamic Force 4-cylinder engine in SE, LE, and XLE trims (203 hp), or a 2.5L hybrid system (225 hp combined) in hybrid trims. Both powertrains use drive-by-wire electronic throttle control (ETC), and the TPS is integrated into the throttle body assembly. It is not a separately replaceable component on this platform.
Toyota's Techstream diagnostic software is the proper tool for reading live TPS voltage data, checking the second TPS sub-sensor (TPS B, which provides redundancy), and verifying ECM input/output data. A generic OBD-II scanner can read the code but cannot provide the circuit-level detail needed for accurate diagnosis.
Symptoms of P0122 on the 2024 Camry
The 2024 Camry's ECM is highly protective. When TPS circuit data is lost, the system activates a failsafe mode that dramatically limits vehicle capability:
- VSC/Traction Control and Check Engine lights: Multiple warning lights typically illuminate simultaneously when P0122 is active, including the check engine light and often the Vehicle Stability Control warning.
- Severe throttle restriction: The engine is limited to a safe, minimal throttle opening. The 2.5L Dynamic Force engine, which normally delivers responsive torque, will feel sluggish and unable to accelerate past approximately 30-40 mph in some cases.
- Electronic Throttle Control warning: Toyota may display a specific ETC warning in the multi-information display, informing the driver that throttle control is impaired.
- Stalling risk at low speed: Without accurate TPS data, idle control can become unstable. The engine may stall when decelerating to a stop, particularly in city driving.
- Transmission hesitation: The automatic transmission relies partly on TPS data for shift timing. Erratic or missing TPS data can cause the transmission to hesitate or shift harshly.
- Hybrid system anomalies (hybrid trims): On the hybrid Camry, TPS faults can interact with the hybrid power management system, potentially triggering additional hybrid system warnings alongside P0122.
Most Likely Causes on a 2024 Camry
A 2024 Camry is brand-new or barely a year old. The cause profile at this age is dominated by production-related issues rather than wear:
- Throttle body connector not fully seated (38-40% likelihood): The most common early-life cause is a multi-pin connector at the throttle body that was not fully latched during manufacturing or during a dealer pre-delivery inspection. Even a connector that appears visually engaged may not have achieved full electrical contact. A technician can verify this by gently attempting to push the connector fully home and retesting.
- TPS internal defect (33-35% likelihood): Early component failures do occur, and Toyota has issued Technical Service Bulletins for throttle body assemblies on TNGA-platform vehicles. Request a TSB check by VIN at your Toyota dealer to determine if a known fix exists for your specific build.
- Harness routing contact with engine components (18% likelihood): During assembly, the wiring harness can occasionally be routed against a sharp bracket or hot surface. In the first year, heat cycling can cause insulation breakdown at the contact point. A visual inspection of the harness from throttle body connector to the main engine harness junction can rule this out.
- ECM software calibration issue (5-7% likelihood): New model year ECMs sometimes carry early software that can misread TPS circuit data. Toyota periodically releases calibration updates via Techstream. A dealer technician can check for pending software updates with no repair cost under warranty.
- Moisture or condensation in connector (2% likelihood): In regions with extreme temperature swings, early connector boot failures can allow condensation to form inside the connector, temporarily shorting the signal circuit.
Repair Costs and Warranty Coverage
Your 2024 Camry is fully covered under Toyota's 3-year/36,000-mile bumper-to-bumper warranty — and P0122 is almost certainly covered at zero cost to you. Toyota's 5-year/60,000-mile powertrain warranty and 8-year/80,000-mile federal emissions warranty provide additional backup coverage.
The correct course of action is to contact a Toyota dealer immediately, describe the symptoms and code, and schedule a diagnostic appointment. Do not attempt any DIY repairs or visit an independent shop before using your warranty — unauthorized repairs can invalidate the claim. Bring the Techstream-connected dealership into the investigation first.
For reference, if out-of-warranty repair were needed:
- Connector inspection and reseating: $0-$100
- Throttle body replacement (2.5L 4-cylinder): $310-$530
- Throttle body replacement (2.5L hybrid): $320-$540
- Wiring harness repair: $150-$350
- ECM software update/reflash: $0-$150
Urgency and Next Steps
P0122 is an immediate-action code. The safety risk is real: a throttle system in failsafe mode makes the vehicle unpredictable during highway driving, merging, or emergency maneuvers. Do not continue driving your 2024 Camry normally until this is resolved. Contact Toyota Roadside Assistance if the vehicle is undrivable, or drive carefully at low speed to the nearest Toyota dealer.
Given that your truck is under full warranty, there is no financial reason to delay. Schedule the dealer appointment today and request that the technician use Techstream to capture live TPS A and TPS B voltage data during the diagnosis. This will quickly isolate whether the fault is in the sensor, the connector, the harness, or the ECM reference circuit.
How AutoDetective AI Can Help
AutoDetective's AI diagnostic platform can analyze your 2024 Camry's P0122 code against Toyota's TNGA-K platform failure database, identify any matching TSBs, and provide a probability-ranked repair plan. Enter your VIN for a free preliminary diagnosis and warranty status check before your dealer appointment.