AutoCodes – GMC – P2108 GMC

P2108 GMC Code - Throttle Actuator Control Module Performance

Quick Answer

The Throttle Actuator Control (TAC) module contains data that is essential for proper TAC operation. Common causes include Faulty Throttle Actuator Control (TAC) module, Throttle Actuator Control (TAC) module harness is open or shorted, Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires). 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: P2108 GMC indicates Throttle Actuator Control Module Performance.
Common causes: Common causes include Faulty Throttle Actuator Control (TAC) module, Throttle Actuator Control (TAC) module harness is open or shorted, Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires).
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 13,712

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 Jun 21, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2108 GMC Description

The Throttle Actuator Control (TAC) module contains data that is essential for proper TAC operation. The TAC module continuously tests the integrity of this data. When the TAC module is unable to write or read data to and from Random Access Memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Diagnostic Trouble Code (DTC) is set.

OBDII Code P2108 GMC - Throttle Actuator Control Module Performance - AutoCodes.com — P2108 GMC Code - Throttle Actuator Control Module Performance

What does this mean?

What are the Possible Causes of the DTC P2108 GMC?

Faulty Throttle Actuator Control (TAC) module
Throttle Actuator Control (TAC) module harness is open or shorted
Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)

How to Fix the DTC P2108 GMC?

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

There is a factory service bulletin for the P2108 code on following GMC vehicles:

2006-2007 GMC Savana 1500/2500/3500
2006-2007 GMC Sierra
2006-2007 GMC Sierra Flex Fuel
2006-2007 GMC Sierra Hybrid
2006-2007 GMC Sierra Performance Edition
2006-2007 GMC Sierra 2500/3500 HD
2006-2007 GMC Yukon
GMC Factory Service Bulletin OBDII Code P2108

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2108 GMC 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 P2108 GMC Code

What does the OBDII code P2108 mean on a GMC?

P2108 indicates a performance issue with the Throttle Actuator Control (TAC) Module, which monitors and controls the electronic throttle system.

What are the common symptoms of the P2108 code in a GMC?

Symptoms may include reduced engine power, the vehicle going into "limp mode," poor throttle response, and the Check Engine Light being illuminated.

What causes the P2108 code on a GMC vehicle?

Common causes include a faulty throttle actuator control module, damaged wiring or connectors, software issues, or a failing throttle body.

Can a dirty throttle body trigger the P2108 code?

Yes, a dirty or malfunctioning throttle body can interfere with the throttle actuator's performance and trigger the P2108 code.

How do I diagnose the P2108 code on my GMC?

Diagnosis involves checking the throttle actuator control module and throttle body for faults, inspecting wiring for damage, and using a scan tool to monitor sensor data.

Can I still drive my GMC with the P2108 code?

Driving with this code is not recommended, as it may result in reduced engine performance or limp mode, which could compromise safety.

How can I fix the P2108 code on a GMC vehicle?

Repairs could include cleaning or replacing the throttle body, repairing damaged wiring, updating the TAC module’s software, or replacing the module if necessary.

How much does it cost to fix a P2108 code on a GMC?

Repair costs can vary widely, ranging from $100 for a throttle body cleaning to $500 or more for module replacement or wiring repairs.

Do I need to reset the code after repairs?

Yes, after completing repairs, use a scan tool to clear the code and verify that it does not return.

Can a low battery cause the P2108 code to appear?

Yes, a weak or failing battery may cause voltage irregularities that can affect the throttle actuator control module's performance and trigger the code.