P2135 Fault Code
You can find information about the P2135 fault code on this page.
It is one of the most popular fault codes that people search for on this website (in the top 50).
We have given it a seriousness of 9/10 with 1 being the least serious and 10 being the worst.
P2135 Short Description
"Throttle/Pedal Position Sensor/Switch A / B Voltage Correlation"Read More ▼ Ask Question
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Fault code P2135 is logged when the powertrain control module (PCM) has detected an issue with the throttle position (TP) and accelerator pedal position (APP) sensors.
This occurs when the signals from these two or more sensors are not correlating with one another, giving an incorrect position reading.
The PCM uses the position sensors of both components to confirm that the accelerator pedal is providing the correct response in accordance with the opening and closing of the throttle body. This is particularly important with electronic throttle control.
This code specifically focuses on an issue on the side of the TP sensor. Fault code P2138 is used for a correlation issue on the side of the APP. It is possible for both of these codes to be logged.
Manufacturers like Chevrolet, Infiniti, and Suzuki are some of the more commonly reported to have this fault code.
Other Signs of This Problem
There may be some very noticeable signs of an issue like P2135. One of the most obvious is the presence of the Check Engine light on the dashboard.
Another very obvious sign is that the vehicle may not accelerate properly, regardless of how hard the accelerator pedal is applied.
Additionally, the performance can be decreased in other ways. These can be things like stalling or even the vehicle not starting.
In many cases, the vehicle will enter limp mode until the fault code is fixed.
It is also possible that other APP and TP sensor fault codes can be logged. Look out for codes between P2120 and P2128.
What Could Be The Problem?
It is possible that there may be one or more likely causes for this type of issue as the PCM cannot pick up the correct correlation between the two sensors. However, most of the possible causes are electrical in nature.
Two of the most likely causes are faults in either the TP sensor or the APP sensor. It is also possible that both of these sensors are faulty – triggering this P2135 fault code.
Additionally, problems in their circuits can also cause this issue. Loose or damaged wires can cause errors like this to occur.
A faulty throttle body actuator can also cause this issue as the throttle is not responding correctly to the inputs.
A less likely, but still possible, cause is that the PCM is running on outdated software or that it is faulty.
Fixes for this fault code are focused mostly on ensuring all the circuitry in the respective sensor circuits is working properly.
Both the TP and the APP sensors should be tested. If either or both are faulty, they should be replaced.
All wiring and connections to the sensor and PCM must be checked for damage, fraying, or looseness. If there are any of these issues, they need to fix accordingly.
If the PCM is faulty, it should be replaced. Similarly, if the PCM needs a software update, it should be done.
Fault code P2135 is a serious issue. This is because the vehicle will not be able to run properly with this code. It is also very dangerous to lose throttle response in some scenarios.
It is recommended this problem is addressed immediately to resume the normal operation of the vehicle.
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