P2135 Chevy Silverado (Meaning, Causes, and Fixes)

The manufacturers have developed several Generic Onboard Diagnostic Trouble Codes and installed them into most modern Chevy Silverado vehicles to warn the users about potential internal malfunctioning or failures.

The P2135 is one of them and indicates that the vehicle’s Powertrain Control Module (PCM) has detected a suspicious problem with one of the Throttle and/or the Pedal Position Sensors or Switches, and the voltage reading result of the Throttle Body Position Sensor does not match with the Accelerator Pedal Position Sensor.

Thus, do not panic once you see the P2135 code flashing on your Chevy Silverado, and follow the instructions provided in today’s article to fix it.

What Does P2135 Code Mean On Chevy Silverado?

The P2135 on Chevy Silverado means system has detected an error in your vehicle’s Throttle/Acceleration Pedal Position Sensor/Switch A & B Voltage Correlation.

When the PCM or ECM detects or receives an incorrect reading concerning one of the Throttle component’s voltage transmissions, it sends a signal that triggers this P2135 code.

Before I start explaining more details, let’s check out the dissection of the P2135 code:

• p- Powertrain (System of components compelling the Chevy Silverado forward)
• 2-Generic malfunction code generated via PCM
• 1-Specific System related to the Throttle Position Sensors/Switches
• 35-This particular information indicates that the voltage transmitted by the Throttle Control System components are not correlatedly matching.

How The Throttle Position Sensors Trigger the P2135 Code on Chevy Silverado?

Mainly Throttle Position Sensors are supposed to produce or generate similar reading outputs.

It means there should be a correlation between the transmitted voltage reading of the Throttle Position Sensor A/B, the Throttle plate, and the Acceleration Pedal Position Sensor or switches.

Each sensor sends a voltage reading signal correlation to the Throttle plate position output to the Power Control Module because the PCM regularly compares those generated Sensor outputs to verify their efficiency and promptness.

The Engine Control Module’s job is to interpret those received signals to determine how far the vehicle’s Throttle plate is open.

Thus, PCM expects a similar or close reading output from these throttle System components.

But when one of the Sensors reads a drastically different reading than others, like one sensor is signaling half Throttle but the other is signaling full Throttle, it means there’s an error or failure in the system.

That’s when PCM sends signals to trigger the P2135 error code and let the users know about this internal issue.

Is P2135 Code On Chevy Silverado A Critical Problem?

Initially, the P2135 code might not seem like a critical issue, but this error will eventually cause stalling problem on your vehicle.

This stalling can turn really bad as time passes. Especially if it happens during heavy traffic or while taking turns, it can become dangerous.

Therefore, you should consider this P2135 as an important error code to take the necessary action as soon as possible.

What Causes Code P2135 On Chevy Silverado?

Check out the potential causes behind the P2135 code on your vehicle:

• When your vehicle PCM malfunctions or fails (mainly happens when the software is not updated), it will send a false or incorrect signal to trigger a false alarm.
• If one or both throttle position sensors are faulty or the acceleration position sensor has malfunctioned (Throttle Position Sensor failure), the P2135 code might show up.
• When the throttle position or pedal position sensor circuits are open or short, the P2135 code might also trigger up.
• Issues like built-up corrosion, worn-out/damaged wiring, and poor, loose/broken electrical connections on the Throttle Position or Pedal Position Sensor circuits can also cause the P2135 to illuminate.
• This trouble code might show up if you use incorrect dielectric grease or any other internal issue with the Throttle body.

Other Symptoms Of Getting P2135 Code On Chevy Silverado

Let’s check out common symptoms that will give you a heads-up about your Chevy Silverado’s potential internal problem:

• The engine might rev up without pressing the gas pedal.
• The Revolutions Per Minute will turn higher than it is supposed to, and you won’t be able to change the Throttle from the current RPM.
• You will notice engine surges when hitting the gas or visibly hesitates during acceleration.
• You will notice that your Check Engine Light (CEL) is illuminating, or the engine might automatically turn into Reduced Power (Limp Home) mode
• You might notice that your vehicle tends to stop suddenly. You might encounter your vehicle stalling even after shutting off.
• You might also notice that your vehicle suddenly started to frequent stalling, which might also end with the Chevy vehicle shutting down.

How To Fix The P2135 Code On The Chevy Silverado?

After noticing the P2135 error code on your Chevy Silverado vehicle, do not panic.

All you have to do is follow below explained easy steps to get rid of that trouble code-

Video: How to Fix CHEVROLET P2135 Code With Easy DIY

1. Disconnect the battery & Take the Cover Off

First, use a 10-millimeter and disconnect the negative side of the internal battery.

Then, push it out of the way and move to pop the cover off next.

Just take the cover off.

2. Unthread the Intake Mounting Duct/Bolt & PCV Hose

Use an 8-millimeter flat-blade screwdriver to remove the intake mounting duct or bolt.

Disconnect the PCV valve carefully by angling it a little bit and do not break the nipple.

Next, move the intake aside a little bit to get better access.

3. Disconnect the Throttle Connecting Plug

Disconnect it with the help of a flat head screwdriver or something like that.

4. Disconnect the Bolts & Remove the Throttle Assembly:

  
Now take off these bolts (total 4 bolts) with a 10-millimeter and remove the throttle part.

Check whether the gasket is flat or not, and if it is not flat, you can reuse it.

5. Clean the Throttle Assembly Thoroughly

Visibly inspect everything and clean the surfaces as needed.

Use some brake cleaner to clean the internal area of the throttle assembly.

6. Replace the Parts & Reinstall Everything Accordingly

Then remove the gasket and get a new gasket (available with the throttle body replacement kit).

Next, replace the gasket.

Put the new throttle part and then reinstall or put everything else back securely.

Once you are done with putting everything back together accordingly, do not forget to test your vehicle with the scanner.

How Much Does It Cost To Fix The Chevy Silverado P2135 Code?

Generally, the repair or replacement task to fix the P2135 trouble code on any vehicle, including the Chevy Silverado will cost anywhere between $100 and $1500.

Also, the labor expense stays between $75 and $150.

Parts	Estimated Price
Throttle Body Actuator Repair/Replacement	$300 up to $1500
Throttle Position Sensor Replacement	$125 to $256
Accelerator Pedal Position Sensor Replacement	$130 up to $200
TPS Wiring repair/replacement	$100 to $500 or $1000

Remember, the cost will fluctuate based on your vehicle’s model, damage severity, the current price of the replacement parts, and the labor rate of your area.

Frequently Asked Question (FAQs)

Final Thoughts

In today’s article, I already shared everything you need to know about the P2135 code that most Chevy Silverado users commonly see while using their vehicles.

But if my suggested techniques or method of fixing this trouble code does not work on your Chevy Silverado, I highly recommend taking your vehicle to the nearest workshop.