AutoCodes – GMC – P2135 2018 GMC Sierra

P2135 2018 GMC Sierra Code - Throttle Position Sensors 1-2 Not Plausible

Quick Answer

The Throttle Body Assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. Common causes include Faulty Throttle Body Assembly, Throttle Body harness is open or shorted, Throttle Body circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2135 2018 GMC Sierra indicates Throttle Position Sensors 1-2 Not Plausible.
Common causes: Common causes include Faulty Throttle Body Assembly, Throttle Body harness is open or shorted, Throttle Body circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 276

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 20, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P2135 2018 GMC Sierra Description

The Throttle Body Assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. The throttle position sensor is mounted within the throttle body assembly and is not serviceable. The Engine Control Module (ECM) supplies the throttle body with a 5 V reference circuit, a low reference circuit. The asynchronous signal means communication is only going from the throttle body to the ECM. The throttle body cannot receive data from the ECM over the signal/serial data circuit. The throttle position sensor provides a signal voltage that changes relative to throttle blade angle. The throttle position sensor information is transmitted between the throttle body and the ECM on the signal/serial data circuit. The ECM decodes the serial data signal and is used as voltages for throttle position sensor 1 and 2. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that throttle position sensors 1 and 2 disagree greater than 7 - 10 percent for greater than 1 s.

OBDII Code P2135 2018 GMC Sierra - Throttle Position Sensors 1-2 Not Plausible - AutoCodes.com — P2135 2018 GMC Sierra Code - Throttle Position Sensors 1-2 Not Plausible

What does this mean?

What are the Possible Causes of the DTC P2135 2018 GMC Sierra?

Faulty Throttle Body Assembly
Throttle Body harness is open or shorted
Throttle Body circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2135 2018 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2135 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2135 2018 GMC Sierra Code

What does the OBDII code P2135 mean on a 2018 GMC Sierra?

The code P2135 indicates a discrepancy between the readings of Throttle Position Sensor 1 and Sensor 2, suggesting they are not providing plausible data to the engine control module.

What are the symptoms of code P2135 on a 2018 GMC Sierra?

Common symptoms include reduced engine power mode, poor acceleration, hesitation, and possible stalling.

What causes code P2135 on a 2018 GMC Sierra?

The code can be caused by a faulty throttle position sensor, wiring issues, connector problems, or a malfunctioning throttle body.

Can I drive my 2018 GMC Sierra with the P2135 code?

Driving with this code is not recommended as it can lead to reduced engine performance and safety risks due to sudden loss of power.

How do I fix code P2135 on a 2018 GMC Sierra?

Repair may involve inspecting and replacing the throttle position sensors, checking the throttle body, and addressing any wiring or connector issues.

How do I diagnose the P2135 code on a 2018 GMC Sierra?

Diagnosis involves using a scan tool to monitor sensor readings, visually inspecting the wiring and connectors, and testing the throttle position sensors for proper functionality.

Does the throttle body need to be replaced for code P2135?

Not always. The throttle body may need replacement only if the sensors or internal mechanisms are faulty and cannot be repaired.

Can cleaning the throttle body resolve the P2135 code?

Yes, if carbon buildup or debris is causing sensor interference or movement issues, cleaning the throttle body might resolve the code.

How much does it cost to fix code P2135 on a 2018 GMC Sierra?

The repair cost varies but typically ranges from $200 to $600, depending on whether the throttle position sensors or throttle body needs replacement.

What happens if I ignore the P2135 code on my GMC Sierra?

Ignoring the code can lead to further engine performance issues, potential stalling, and reduced fuel efficiency, compromising safety and reliability.