P2135 Code – Meaning, Causes, Symptoms And How To Fix It!

Written By: Terrence Hines
Category: Error Code

If your vehicle has presented with the P2135 code, it’s important to address the issue as some of the most common causes for this code can result in decreased fuel economy and many others.

If you can’t find a solution to your car’s problem, it is time to seek professional help. An expert technician can pinpoint the issue and offer the necessary repairs.

What Does The P2135 Code Mean On Your Car’s Dashboard Display?

When your car’s dashboard display reveals a P2135 code, it indicates an issue with the throttle/pedal position sensor switch “A” and “B” circuit malfunction.

This usually suggests an electrical fault in either the accelerator pedal electrical circuits or the Electronic Throttle Control (ETC) system.

Without accurately identifying changes in the accelerator pedal position, the engine’s electronic control unit (ECU) will not be able to adjust power output levels as necessary properly.

It is important to have your vehicle examined by an experienced technician at once to identify and correct any system defects before further damage occurs.

Causes Of The P2135 Code

The P2135 code is an error code that appears on the dashboard of a car. It typically indicates a problem with the throttle position sensor.

What Does The P2135 Code Mean On Your Car's Dashboard Display?

This regulates the fuel-to-air ratio by measuring how far the accelerator pedal has been depressed and communicating that information to the engine control module.

Other common causes of this code include an electrical fault in the wiring or connectors of the throttle position sensor or a malfunction of either the throttle body or the motor.

Occasionally, it may occur because of damaged exhaust gas recirculation valves or faulty fuel injectors.

To correctly diagnose and repair this problem, any potential root causes must be thoroughly investigated to determine what is causing the P2135 code to appear on your dash.

Here are some most common causes that will help you sort out the issue as;

1. Intake Valve Control Circuit:

The Diagnostic Trouble Code number P2135 can indicate a variety of causes, but one of the most common is an issue with the intake valve control circuit.

This code is triggered when the electrical signals from the PCM to the throttle control are not within spec.

Depending on your specific vehicle, it could be caused by loose wiring, dirty or water-damaged connectors, faulty relays, worn-out motor terminals, or even a deteriorated harness.

By accurately diagnosing the cause of this code and fixing any underlying issues, you can get back on the road and avoid further problems with your vehicle.

2. Intake Manifold Runner Control Circuit:

One of the causes for the P2135 fault code to appear is an issue with the Intake Manifold Runner Control Circuit.

This component works by aiding in managing the throttle body’s engine output, helping to provide a smoother and more efficient ride.

Unwanted buildups, such as dirt and debris, can impede the equilibrium of airflow in a circuit, resulting in potential issues.

This causes chaos throughout the engine system and causes contamination of sorts that may result in the up-mentioned P2135 fault code.

3. Engine Coolant Temperature Sensor:

The Engine Coolant Temperature Sensor is one of the causes of the P2135 code.

This code indicates an issue was detected in the Electronic Throttle Control System, a device that helps regulate air flow entering a vehicle’s engine.

Engine Coolant Temperature Sensor

The sensor provides data from the coolant’s temperature to the Powertrain Control Module or PCM, which uses this information to regulate various functions.

If the Engine Coolant Temperature Sensor fails, it can mislead the PCM into thinking an inaccurate amount of air should be released, resulting in a Check Engine Light with code P2135.

4. Throttle Position Sensor:

A P2135 code can commonly occur due to a bad Throttle Position Sensor (TPS) that cannot supply an accurate reading.

If anything goes awry with your TPS, the throttle body plates may become stuck or misaligned.

As the TPS can affect engine power output and performance, this causes friction within the internal components of the car’s engine resulting in your vehicle’s P2135 code being triggered.

Regular maintenance checks can help to detect faulty sensors earlier on and prevent severe damage down the line.

5. Mass Air Flow Sensor:

 Amongst the causes of a P2135 code, one is the Mass Air Flow Sensor (MAF). This part measures the amount of air entering an engine to maintain the correct balance of oxygen and fuel.

When the MAF fails to measure and regulate the air intake flow adequately, it causes airflow disruption, which triggers a P2135 code to signal an issue with the throttle position system.

You might experience diminished engine prowess, stalling, difficulty starting your car, or even idling issues.

If you think something may be wrong with your vehicle’s MAF sensor, you must get it checked out immediately.

Symptoms Associated With The P2135 Code

The P2135 code is a common car fault code for the throttle/pedal position sensor/switch A input malfunction.

As a result, symptoms associated with this code can include issues with the engine, typically regarding acceleration and jerking motions.

If your car has the P2135 code, it could malfunction. When this happens you may experience a check engine light switch on and difficulty accelerating.

Additionally, you might notice a strange idling or slow shift in gear when driving your vehicle.

If your car has these symptoms, you must replace the broken parts or adjust the wiring harness. It is important to fix this problem quickly, or it could worsen your car’s drive.

1. Check Engine Light Is On:

The Check Engine Light can be scary but shouldn’t always signal panic.

Usually, this light coming on means you have symptoms associated with the P2135 code – powertrain control module, throttle pedal, and throttle position sensor.

This code indicates an electrical fault preventing your vehicle from accelerating, as you would expect.

What Does The P2135 Code Mean?

If your Check Engine Light appears to be on, you should take your car in for a diagnosis and repair to keep it running at its best.

2. Vehicle Loses Power While Driving:

Losing power while driving can be an alarming and potentially dangerous experience.

If your car suddenly loses power, and you see a P2135 trouble code displayed on the car’s computer system, it could indicate an electrical failure in the throttle control actuator.

If you experience this symptom, having your vehicle checked out as soon as possible is important to prevent further damage.

3. Rough Idle And Hesitation When Accelerating:

Rough idle and hesitation when accelerating – symptoms associated with the P2135 code – can be a concerning experience for any car owner.

Electrical issues usually cause this problem in the Throttle/Pedal Position Sensor/Switch Circuit or an issue related to the Throttle Actuator Control Motor Circuit.

Other symptoms may include engine stalling, stuttering, jerking when trying to accelerate, low idle speed or RPMs, and check engine light activation.

Repairing this issue is essential as it can lead to further damage when not addressed properly.

4. Engine Sounds Louder Than Normal:

If you’re hearing a thunderous noise coming from your car engine, do not hesitate to get it inspected right away.

That P2135 code can have serious and expensive repercussions if ignored. So get it taken care of right away to prevent further damage!

Heed the warning signs before they worsen – take action to avoid any unwanted surprises down the line! Investigate excessive engine noise now, and save yourself from a costly repair bill later.

5. Increased Fuel Consumption:

 Increased fuel consumption is a tell-tale symptom associated with the P2135 code.

When triggered, this code often points to a malfunction in the Throttle/Pedal Position Sensor/Switch ‘A’/’B’ Voltage Correlation.

Not only can this issue cause an increase in fuel consumption, but it can also lead to decreased performance, hesitation, and stalling when accelerating.

Increased Fuel Consumption

This can be especially troublesome if you rely on your car for work or other daily activities.

As such, it’s important that any symptoms of increased fuel consumption caused by the P2135 code be addressed promptly.

How Can You Fix The P2135 Code In Your Vehicle?

The P2135 code can be a frustrating and worrisome issue to tackle in your vehicle, but there are steps you can take to troubleshoot and potentially fix the issue.

One of the first solutions is disconnecting your battery for about 30 seconds — this may reset the code and, if done properly, could be an easy fix.

If not, the next solution is to check voltage readings at the throttle position sensors.

It’s best to refer to a professional mechanic for this second step as it requires some technical skill and knowledge of properly using a handheld diagnostic tool.

The discrepancy in voltage readings needs to be tackled by identifying which of the two sensors is malfunctioning or bad.

If no issues are found here, more intensive repairs may be necessary, such as examining connections and wiring and replacing parts.

The P2135 code can be difficult to find and fix, but if you are patient, follow the right steps, and get help from experts when you need it, you can fix your car.


The P2135 code is an important diagnostic tool for vehicle performance and engine systems.

By recognizing this code and taking the proper steps to address it, drivers can remain safe on and off the road.

Drivers need to know their vehicle’s codes. This way, they can figure out problems quickly and be sure about the problem.

Furthermore, if a driver experiences symptoms that suggest something is wrong, they must consult a professional mechanic to inspect their car properly.

This will ensure that any trouble caused by the P2135 code can be identified and corrected before further damage or danger arises.

Terrence Hines

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