What Is the P2135 Code?
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The P2135 code has to do with your vehicle’s relationship between the engine control module (ECM), the accelerator pedal, and the throttle body that pushes air into the engine. Most modern vehicles today have a drive-by-wire system for the accelerator pedal or gas pedal just like a modern jet fighter. Manufacturers have replaced a traditional mechanical throttle cable for two sensors and an actuator. When you press on the throttle, the ECM interprets these signals by opening the throttle on the engine. The ECM needs to know where the throttle pedal is and the throttle plate in the engine to determine the operating requirements.
The ECM monitors these signals and expects them to stay within a logical and pretty close range of one another. So, for instance, if one throttle position sensor reads at half throttle but the other reads at full throttle, the ECM will set the P2135 code because the voltage readings are so far apart that it’s impossible for the data to be accurate.
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What Are the Symptoms of a P2135 Code?
One of the symptoms of a P2135 code is that you may experience either a surge or even a hesitation when you’re accelerating your vehicle. This is because the voltage readings produced by the throttle position sensor and the pedal position sensor are not in alignment with one another. The ECM then assumes that there is an issue and may even place your vehicle in a ‘fail-safe mode”, which normally limits vehicle acceleration to about 15%.
Another symptom of a P2135 code is that your engine may continue revving even when the gas pedal isn’t depressed. This causes higher than normal RPMs throughout your driving session and may even cause the vehicle to stall out when stopped. This is also accompanied by the check engine light coming on. For more information on other check engine, light causes and issues visit KBB’s Check Engine Light guide.
What Are Some Causes of a P2135 Code?
Some common causes of a P2135 code are faulty throttle position sensors or faulty accelerator position sensors. If either of these sensors is defective they will deliver wrong voltage readings to the ECM and trigger the code. A faulty ECM itself can sometimes be at fault for the P2135 code setting and should be looked at when diagnosing the issue. However, a disruption in the throttle position sensor circuit such as an open or shorted wiring can also cause the P2135 to set. It’s important to note that any disruption in the accelerator pedal position sensor circuit will also set the code as these sensors work in tandem with one another. Any damage to the wiring leading to the ECM, and any cracks in the wiring harnesses, can also cause the issue to appear. This is why it’s important to thoroughly diagnose and inspect these systems to ensure you are repairing the right thing.
How Serious Is the P2135 Code?
The P2135 code can cause your vehicle’s engine to rev higher than normal or completely stall out. This can be a serious concern if you’re driving in heavy traffic or making quick turns through intersections. This is why it’s considered a relatively serious issue and should be addressed by a qualified technician as soon as you notice the code setting or your Check Engine light turning on.
Can I Still Drive with a P2135 Code?
Since the P2135 code can cause potential disruptions in how the vehicle responds to your use of the accelerator pedal, driving with the code set is not recommended. You can cause potential harm to yourself or other drivers in traffic if you’re no longer able to effectively control the speed your car is traveling at.
The ECM will often combat the code by placing your vehicle in a fail-safe mode that restricts acceleration to a mere 15%. This can also be problematic if you find yourself on roads with higher speed limits like highways. This is why it’s recommended to tow your car to your nearest technician to immediately address the issue.
For a more detailed list of service centers near you, visit KBB’s service center list.
How Easy Is It to Diagnose a P2135 Code?
Properly diagnosing a P2135 issue involves taking proper voltage level readings of the accelerator pedal position sensor as well as the throttle position sensor. A common multimeter tool is used to gather these readings and they should be compared to the manufacturer’s specifications by a professional mechanic. This is why you should allow experienced mechanics to diagnose your vehicle when a P2135 code issue arises.
How Difficult Is It to Inspect a P2135 Code?
Repairing a P2135 code issue is relatively easier than properly diagnosing the issue. This is because it usually involves just replacing one or both of the throttle position sensors, or the accelerator position sensor. The difficulties, however, can arise when repairing shorts in the circuits that lead to and from the sensors and to the ECM. This requires more attention to detail and should be performed by experienced technicians.
Can I DIY a P2135 Code Myself?
It’s not a good idea, issues can arise if you mix up the first and second throttle position sensors and this can result in replacing the wrong sensor. If your mechanic have properly diagnosed the cause of the P2135 issue, then they should be able to repair the issue t could involve simply replacing the throttle position sensors or the accelerator position sensor, the issue could also lay with the wiring circuits.
For more information on the P2135 and other diagnostic codes, visit KBB’s vast library of OBD-II codes.
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