AutoCodes – GMC – P2101 2018 GMC Sierra

P2101 2018 GMC Sierra Code - Throttle Actuator Position Performance

Quick Answer

The Engine Control Module (ECM) determines the driver's intent based on input from the accelerator pedal position sensors, then calculates the appropriate throttle response based on the throttle position sensors. Common causes include Binding or bent Throttle Plate, Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted. 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: P2101 2018 GMC Sierra indicates Throttle Actuator Position Performance .
Common causes: Common causes include Binding or bent Throttle Plate, Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted.
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 616

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 Aug 13, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2101 2018 GMC Sierra Description

The Engine Control Module (ECM) determines the driver's intent based on input from the accelerator pedal position sensors, then calculates the appropriate throttle response based on the throttle position sensors. The ECM controls the throttle valve by applying a varying voltage to the control circuits of the Throttle Actuator Control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the TP sensor signal/serial data circuit to determine the actual throttle valve position. The TP sensor information is transmitted between the throttle body and the ECM on the signal/serial data circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the actual throttle position does not match the predicted throttle position for greater than 1 s.

OBDII Code P2101 2018 GMC Sierra - Throttle Actuator Position Performance - AutoCodes.com — P2101 2018 GMC Sierra Code - Throttle Actuator Position Performance

What does this mean?

What are the Possible Causes of the DTC P2101 2018 GMC Sierra?

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

How to Fix the DTC P2101 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2101 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.

Need more information about the P2101 2018 GMC Sierra code?

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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 P2101 2018 GMC Sierra Code

1. What does the OBDII code P2101 mean on a 2018 GMC Sierra?

P2101 indicates a problem with the throttle actuator control system, specifically a performance issue where the throttle actuator position does not match the expected value.

2. What are common symptoms of code P2101 in a 2018 GMC Sierra?

Common symptoms include reduced engine power, the "Check Engine" light turning on, poor acceleration, and possibly entering limp mode.

3. What causes the P2101 code to appear on a 2018 GMC Sierra?

Possible causes include a faulty throttle body, damaged throttle actuator motor, wiring or connector issues, or a malfunctioning Powertrain Control Module (PCM).

4. Can a dirty throttle body trigger code P2101 on a GMC Sierra?

Yes, carbon buildup or debris on the throttle body can prevent proper movement, leading to the P2101 code.

5. How can I fix the P2101 code on my 2018 GMC Sierra?

Start by cleaning the throttle body, inspecting wiring and connectors for damage, and testing the throttle actuator motor. Replace faulty components if necessary.

6. Is it safe to drive my 2018 GMC Sierra with the P2101 code?

Driving with the P2101 code is not recommended, as it may limit engine power and affect drivability, potentially leading to unsafe conditions.

7. How much does it cost to repair the P2101 code on a GMC Sierra?

Repair costs can vary widely, from $50 for a throttle body cleaning to $500 or more for replacing the throttle body or actuator motor.

8. Can a software issue cause the P2101 code on a 2018 GMC Sierra?

Yes, a software glitch in the PCM could cause the code. A PCM reflash or update may be required in some cases.

9. Will disconnecting the battery clear the P2101 code on a GMC Sierra?

Disconnecting the battery may temporarily clear the code, but it wonâ€™t fix the underlying issue and the code is likely to return.

10. How do I diagnose the P2101 code on my 2018 GMC Sierra?

Use an OBDII scanner to confirm the code, inspect the throttle body and wiring, and perform tests on the throttle actuator motor with a multimeter or diagnostic tools.