AutoCodes – GMC – P2135 2015 GMC Sierra

P2135 2015 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 2015 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 267

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 2015 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 2015 GMC Sierra - Throttle Position Sensors 1-2 Not Plausible - AutoCodes.com — P2135 2015 GMC Sierra Code - Throttle Position Sensors 1-2 Not Plausible

What does this mean?

What are the Possible Causes of the DTC P2135 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P2135 mean on a 2015 GMC Sierra?

P2135 indicates a correlation issue between Throttle Position Sensor (TPS) 1 and TPS 2, meaning the signals from the sensors are not matching as expected.

2. What are the symptoms of code P2135 on a 2015 GMC Sierra?

Symptoms include reduced engine power, poor acceleration, the "Reduced Engine Power" warning on the dashboard, and possible stalling or hesitation.

3. What causes the P2135 code on a 2015 GMC Sierra?

Common causes include a faulty throttle position sensor, wiring issues like damaged or corroded connectors, a dirty or malfunctioning throttle body, or a problem with the engine control module (ECM).

4. Can I drive my 2015 GMC Sierra with the P2135 code?

It is not recommended to drive with this code, as the vehicle may enter "limp mode," resulting in reduced power and posing safety risks.

5. How do I fix code P2135 on a 2015 GMC Sierra?

Repairs often involve cleaning or replacing the throttle body, repairing damaged wiring, or replacing the throttle position sensor. A thorough diagnosis is essential to pinpoint the root cause.

6. How much does it cost to repair a P2135 code on a 2015 GMC Sierra?

Costs can vary, ranging from $100 to $500 or more, depending on whether the throttle body, TPS, or wiring needs repair or replacement.

7. Can a dirty throttle body cause the P2135 code?

Yes, a dirty or clogged throttle body can disrupt the TPS readings, leading to the P2135 code.

8. How do I clean the throttle body to fix the P2135 code?

Disconnect the battery, remove the air intake hose, and use throttle body cleaner and a soft cloth to clean the inside of the throttle body. Avoid damaging the sensors or internal components.

9. Could a failing ECM cause the P2135 code on a 2015 GMC Sierra?

While less common, a malfunctioning Engine Control Module (ECM) can cause P2135 if it incorrectly interprets TPS signals or sends improper commands.

10. Do I need to recalibrate the throttle body after fixing the P2135 code?

In some cases, a throttle body relearn procedure may be necessary after cleaning or replacing components. This can often be done using a scan tool or by following specific steps outlined in the vehicle manual.