What Does the Engine Code P2135 Mean?

If your car displays the engine code P2135, then there is likely a problem with the throttle control systems.
Written by Georgina Grant
Reviewed by Melanie Reiff
If your car displays the engine code P2135, you’re likely dealing with a problem in your throttle control system. This system controls the amount of air that enters the car’s engine, and problems can affect the vehicle’s acceleration.
Your car’s computer uses diagnostic trouble codes (DTCs) to indicate any issues with the engine. When the
Check Engine Light comes on
, you can plug an OBD-II scanner into the car, and this tool will inform you of the trouble code associated with the problem.
Below, the
car insurance
comparison app
has provided everything you need to know about the P2135 engine code, including its meaning, causes, symptoms, and repair costs.

What does the engine code P2135 mean?

A P2135 engine code indicates that your car’s engine control module (ECM) has detected a problem with one of the following components in your throttle control system:
  • Throttle position sensor A
  • Throttle position sensor B
  • Accelerator pedal position sensor 
  • Throttle plate
The position sensors send voltage readings to the ECM. With this information, your car’s computer knows the position of the throttle plate, which regulates the amount of air that enters your engine.
If the readings from position sensor A and position sensor B don’t line up, the ECM will indicate that there’s a problem. 

How much will it cost to fix?

Because there are multiple possible causes of this engine code, the
cost will really vary depending on the problem. The diagnostic test will probably take one hour, so the labor costs will likely be between $70 and $150, depending on the repair shop’s labor rates. Further costs will depend on your vehicle type, engine type, and the exact issue at hand.

What can cause the P2135 engine code? 

Unfortunately, the P2135 engine code is not straightforward—you could have a number of possible causes on your hands.
This particular trouble code is reported by the engine control module (ECM) when it detects an issue with the throttle control system. There’s always a chance that the ECM itself isn’t working properly, which could trigger the P2135 engine code.
Otherwise, the problem is likely due to a malfunction with the
throttle position sensor
, accelerator pedal position sensor, or throttle plate.
Each position sensor should be sending fairly similar voltage readings to the ECM. When one of the sensors isn’t working properly, the ECM will report a P2135 engine code.
Finally, there could be a physical problem with the wiring that connects the position sensors and the throttle plate to the ECM. A frayed or broken wire could disrupt the transmission of the voltage readings, leading to this trouble code.
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Common symptoms of the P2135 engine code

You will most likely know that there is a problem when you see the Check Engine Light or the Service Engine Soon Warning Light illuminated. You might also notice that there’s a problem if:

How serious is the P2135 engine code?

If your car is showing a P2135 engine code, you’ll need to have it serviced as soon as possible. Problems with your throttle position sensors can lead to acceleration issues. There’s also a chance that your car could stall while you’re driving, which is a major safety issue.

Can I fix the P2135 engine code myself?

You may be able to fix this on your own, but you will need to first identify the source of the problem. Possible repairs include:
  • Replacing a faulty position sensor
  • Replacing a faulty accelerator pedal position sensor
  • Replacing any damaged wiring connecting the position sensors and the ECM
It’s a good idea to take your car to a repair shop for professional help. A licensed mechanic can inspect each component of your throttle system in order to fully diagnose the problem and provide the necessary
car repairs

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