When your 2023 Ford F-150 develops slow or delayed throttle response along with code P2135, you're dealing with a mismatch between the two throttle position sensors on the electronic throttle body. This correlation error triggers reduced power mode and frustrating acceleration lag.
The Electronic Throttle Body Explained
Ford's 2023 F-150 uses an electronic throttle body with dual integrated TPS sensors for redundancy and safety. These sensors monitor throttle plate position and must agree within a tight tolerance. Code P2135 sets when Throttle Position Sensor A and B don't correlate—meaning they're telling the PCM different stories about where the throttle plate actually is.
Common Causes of P2135
The correlation error typically results from: carbon buildup on the throttle body affecting plate movement, a failing throttle body motor, internal TPS sensor failure in the throttle body assembly, loose or corroded electrical connections, or damage to the throttle body wiring. The 5.0L and EcoBoost engines can all experience this issue.
Symptoms You'll Experience
Beyond the obvious slow throttle response, you'll notice the truck entering "limp home" mode with severely limited power, the wrench warning light illuminating, rough or hunting idle, and the engine possibly stalling at stops. Some owners report the issue is intermittent at first before becoming constant.
Diagnosis Protocol
Proper diagnosis requires graphing both TPS A and TPS B signals simultaneously while manually opening the throttle blade. Both should increase smoothly and track within about 3% of each other. A divergence indicates internal throttle body failure. Checking for vacuum leaks and intake air leaks is also important, as these can affect idle and throttle response.
Repair Options
Most P2135 cases on the F-150 require throttle body replacement. Ford's throttle bodies come pre-calibrated and self-learn after installation. A thorough throttle body cleaning may resolve issues caused by carbon buildup, but if sensors are actually failing, replacement is the only permanent fix. After repair, a throttle body relearn procedure may be needed.