Ford Ecosport:  P2135 DTC:  Meaning, Causes, and Diagnosis

If your Ford Ecosport has P2135 it is considered “drive by wire”.  Which means that it uses sensors and actuators to control the throttle body.  Here’s how this method of operating the throttle works:

1. You press the gas pedal.
2. The accelerator position sensor sends a signal to your Ecosport’s PCM.
3. The throttle position sensors (A/B and C/D) confirm the position of the throttle blade and the PCM adjusts the throttle position based on this input.
4. The two throttle position sensor signals need to AGREE with one another AND the accelerator position sensor.
5. If they don’t agree with one another, P2135 is set.

Drive by wire throttle systems use a sensor on the gas pedal to transmit the pedal position (accelerator position sensor) to the PCM, which controls the throttle body.  

The advantage of operating the throttle this way is that with a traditional gas pedal (drive by cable), most of the engine’s torque will be located at the beginning of the throttle, whereas with drive by wire, if you press the throttle down 20%, the computer will give you 20% of the torque.  This allows drive by wire to allow for the torque to come in more gradually.  

This saves wear and tear on the vehicle and prolongs engine life.  Drive by wire also improves:

• Fuel economy
• Emissions
• Traction control response
• Cruise Control

P2135 Symptoms:  Ford Ecosport

Here are the most common symptoms associated with P2135.  They include:

• Reduced engine power
• Strange “pedal feel”
• Engine revving with no throttle input
• Engine stalls
• Limp mode

Ford Ecosport: P2135 Causes + Diagnosis

When your Ecosport has P2135, there are four main issues that cause it.  They are the accelerator pedal position sensor, the throttle position sensor, a wiring issue, or a PCM issue.  Of these issues, the PCM is usually the least likely unless there is a TSB (technical service bulletin) for your engine and model year.  Checking the wiring harness at the pedal and throttle body would be the easiest thing to check.

1. Use a Multimeter to Examine the Wiring

Use a multimeter to see if the voltage coming from the A/B throttle position sensor and accelerator position sensor are within Ford’s specifications.  If they are out of range, you’ll need to replace the sensor in question.