AutoCodes – Generic – P2176

P2176 Code - Throttle Actuator Control System - Idle Position Not Learned

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: P2176 indicates Throttle Actuator Control System - Idle Position Not Learned.
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 24,862

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2176 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 that both throttle position (TP) sensors were greater than a predetermined voltage during the minimum throttle learn the procedure for greater than 2 s.

OBDII Code P2176 - Throttle Actuator Control System - Idle Position Not Learned - AutoCodes.com — P2176 Code - Throttle Actuator Control System - Idle Position Not Learned

What does this mean?

What are the Possible Causes of the DTC P2176?

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 P2176?

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 P2176 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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Information for Specific Makes

P2176 Acura — Throttle Actuator Control System Idle Position Not Learned
P2176 Buick — Minimum Throttle Position Not Learned
P2176 Cadillac — Minimum Throttle Position Not Learned
P2176 Chevrolet — Minimum Throttle Position Not Learned
P2176 Chrysler — Low Airflow/Restriction Detected Slow Accumulation
P2176 Dodge — Low Airflow/Restriction Detected Slow Accumulation
P2176 Ford — Throttle Actuator Control System - Idle Position Not Learned
P2176 GMC — Minimum Throttle Position Not Learned
P2176 Honda — Throttle Actuator Control System Idle Position Not Learned
P2176 Hummer — Minimum Throttle Position Not Learned
P2176 Jeep — Low Airflow/Restriction Detected Slow Accumulation
P2176 Lincoln — Throttle Actuator Control System - Idle Position Not Learned
P2176 Mercedes-Benz — Throttle Actuator 'A' Control System Idle Position Not Learned
P2176 Mercury — Throttle Actuator Control System - Idle Position Not Learned
P2176 Mitsubishi — Low Airflow/Restriction Detected Slow Accumulation
P2176 Pontiac — Minimum Throttle Position Not Learned
P2176 Saab — Minimum Throttle Position Not Learned
P2176 Saturn — Minimum Throttle Position Not Learned

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.