AutoCodes – Buick – P1518 Buick

P1518 Buick Code - Throttle Actuator Control Module Performance

Quick Answer

The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. Common causes include Dead or weak battery, Faulty Throttle Actuator Control (TAC) module, Throttle Actuator Control (TAC) module harness is ope 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: P1518 Buick indicates Throttle Actuator Control Module Performance.
Common causes: Common causes include Dead or weak battery, Faulty Throttle Actuator Control (TAC) module, Throttle Actuator Control (TAC) module harness is ope 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 3,670

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 26, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
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Code P1518 Buick Description

The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. The TAC module continuously test 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 P1518 Buick - Throttle Actuator Control Module Performance - AutoCodes.com — P1518 Buick Code - Throttle Actuator Control Module Performance

What does this mean?

What are the Possible Causes of the DTC P1518 Buick?

Dead or weak battery
Faulty Throttle Actuator Control (TAC) module
Throttle Actuator Control (TAC) module harness is ope or shorted
Throttle Actuator Control (TAC) module circuit poor electrical connection
Check Throttle Actuator Control (TAC) module connector for water

How to Fix the DTC P1518 Buick?

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 P1518 Buick 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.