P2135 Diagnostic & Fix for 2007 Ford F150 4.2L V6 - Throttle Position Sensor Correlation Issues

The throttle pedal may have play or loose wiring. A common cause of P2135 is a poor connection in the throttle body's pigtail connector—especially corrosion on female terminals or exposed wires shorting to ground. Other potential issues include a distorted throttle body cover, mechanical failure of the electronic throttle body, faulty accelerator pedal sensor, or a failed engine control module (ECM). The PCM may require relearn procedures after reset to properly correlate throttle and pedal position signals. For detailed guidance, refer to FordTech or Makuloco.com for specific throttle body troubleshooting.

Replaced spark plugs, ignition wires, coil pack, ECM, throttle body, and pigtail—still getting P2135. This code specifically relates to the correlation between pedal position sensor A/B voltage signals in the throttle system.

Has the accelerator pedal position sensor been replaced or properly diagnosed? It may be a root cause of the P2135 error.

No, I initially installed a new throttle body but it was actually the pigtail connector causing a short. After installing a new #2 throttle body, the issue resolved for about 60 miles. However, the P2135 code now indicates that a new pedal position sensor is required—this part has been ordered and will arrive soon.

Let me know if installing the pedal position sensor resolves the issue or if the problem returns.

I received the new pedal position sensor but haven't installed it yet—only because I'm unsure whether it will fix the problem. However, since the truck has been running smoothly, I may proceed with installation once confirmed.

Agreed—keeping the replacement part on hand until needed is a prudent approach for intermittent issues like this.

Thanks for the helpful input!

The check engine light returned after installing the pedal position sensor. The truck ran fine for about 80 miles, but on Friday, July 20, 2018, at around AM, the light came back on during startup.

After purchasing a new pedal position sensor from eBay, I now see codes P2135, P2111, and P2104 appearing—indicating that the issue may not be isolated to one component.

At this point, a proper diagnosis is essential. A scan tool capable of graphing throttle and pedal position sensor signals—or a volt/ohm meter to verify voltage/signal from sensors to the PCM—is recommended. Since this issue is intermittent, you should monitor sensor readings while wiggling or tapping connectors to detect signal anomalies. For in-depth troubleshooting, consult FordTech or Makuloco.com—especially their guidance on different throttle body versions used by Ford. Note that P2104 and P2111 often appear as secondary codes related to P2135. Good luck; please share your outcome.

Thank you for the detailed advice—this has been very helpful!