The throttle body is one of the major parts of the vehicle engine. It controls and regulates the entry of air into the engine combustion chamber. The throttle body contains a throttle position sensor. This sensor measures the position of the throttle body and sends information to the powertrain control module (PCM). Whenever your PCM observes a problem with the signals coming from the throttle position sensor, it triggers the P2135 code. This article mainly explains the P2135 code symptoms, its causes, and how to fix it.
P2135 Code Definition
P2135 code stands for “Throttle/Pedal Position Sensor/ Switch A/B Voltage Correlation.”
What Does the P2135 Code Mean?
The P2135 code triggers when the powertrain control module (PCM) detects an issue with the throttle position sensor or the accelerator pedal position sensor.
In the latest vehicle models, the electronic throttle control technology contains an electronically controlled throttle body and throttle position sensor. The throttle position sensor is installed within the inlet of the throttle body.
The throttle position sensor generates a voltage signal based on the throttle valve position. The further the throttle plate/valve is opened, the higher the output voltage of the throttle position sensor.
The accelerator position sensor tells your throttle body how far to open. It is located near the accelerator pedal. It measures the position of the throttle valve and sends this information to the PCM in the form of a voltage signal. As the vehicle driver presses the accelerator pedal, the throttle valve opens.
The accelerator pedal position sensor tells the powertrain control module (PCM) how hard the accelerator pedal is pressed. PCM uses the data and compares it to pre-programmed parameters. The PCM then sends a signal to the throttle position sensor to open the throttle valve based on how hard the accelerator pedal is depressed. All of this takes place in a split second.
When your PCM triggers the P2135 code, it shows that the throttle position sensor or accelerator pedal position sensor is not generating the expected signals.
Symptoms of Code P2135
- Check engine light illumination
- Poor fuel economy
- Surge or even possibly a hesitation when accelerating
- Difficult to start the vehicle
- Poor throttle response
- A sudden reduction in the engine power
- Limp mode
- Poor acceleration
- Engine stalling
Causes of P2135 Code
- Bad accelerator pedal position assembly
- Bad throttle position sensor
- Powertrain control module (PCM) issues
- Bad accelerator position sensor
- Faulty throttle body motor
- Damaged throttle position sensor connectors
- Damaged or corroded throttle pedal sensor wiring
Read More: Bad Throttle Body Symptoms and Causes
How To Diagnose the Code P2135?
- Use an OBD-II scanner to check the trouble codes stored in the PCM memory.
- Use the freeze frame data to check what’s going on. After inspection, clear the codes and make a test drive. If the P2135 code returns, then move for further inspection.
- Inspect the throttle body wiring for corrosion or damage.
- Inspect the throttle body connectors for damage.
- Properly inspect the accelerator pedal position sensor. If this sensor is damaged, replace it.
- Inspect the throttle body motor for damage.
- Inspect the throttle body sensor. If it is clogged, clean it properly. If the sensor is damaged, replace it.
- Inspect the PCM. If there is any damage, then fix it or replace the PCM.
Common P2135 Code Diagnostic Mistakes
- Installing the new parts without testing them.
- Replacing the unnecessary parts.
- Replacing the throttle body sensor before inspecting the wiring and connectors for damage.
- Using the wrong tools to inspect the defective parts.
- Not properly inspecting all the parts.
P2135 Code Repair Cost
The repair cost of the diagnostic trouble code (DTC) P2135 varies according to your vehicle model, your living area, and labor cost. To fix this code, you need one or more of the below-given repairs:
| Parts | Repair Cost |
|---|---|
| PCM replacement | $240 to $3000 |
| Throttle Position Sensor replacement | $100 to $210 |
| Accelerator Position Sensor replacement | $150 to $210 |
| Throttle Body cleaning | $190 to $320 |
FAQ Section
How serious is the P2135 Code?
DTC P2135 is considered a very serious code. This code specifies that the engine throttle is not responding properly, resulting in a potentially dangerous situation. It may lead to various drivability issues, such as poor fuel economy and engine stalling.
This code may often activate a ” reduced power” mode in which your car’s power and top speed are severely limited. The real danger in this situation is that you never know when your car will suddenly go into this emergency mode.
What repairs can fix the P2135 code?
- Replacing the accelerator position sensor
- Replacing the bad throttle position sensor
- Replacing or repairing the damaged or corroded throttle body sensor wiring
- Cleaning the throttle body
- Repairing or replacing the damaged throttle body
- Replacing or repairing the damaged connectors of the throttle position sensor or accelerator position sensor
- Replacing the bad throttle body motor
- Reprograming or replacing the PCM if needed
Can you drive with a P2135 code?
Yes, you can drive with the P3135 code. However, this code is considered a serious trouble code. It may lead to different drivability problems. This trouble code can cause the vehicle to lose its throttle response. If this happens at the wrong time, it could result in a wreck. Therefore, you shouldn’t drive for a long time with this code and fix it as soon as possible.
How do I reset my accelerator pedal sensor?
One of the easiest methods to reset the throttle position sensor is to unhook the negative cable of the battery for approximately five minutes or remove the fuse for the powertrain control module.
What are the causes of P2135?
- Damaged or corroded throttle pedal sensor wiring
- Bad accelerator pedal position assembly
- Bad accelerator position sensor
- Powertrain control module (PCM) issues
- Bad or faulty throttle position sensor
- Dirty throttle body
- Faulty throttle body motor
- Damaged throttle body sensor connectors
Can the throttle body cause acceleration problems?
If the throttle body is not working efficiently, the air entering the engine will become more or less unbalanced, resulting in a lack of power and the car not being able to accelerate properly.