AutoCodes – Isuzu – P1518 Isuzu

P1518 Isuzu Code - Commanded Versus Actual Throttle Position Correlation Large Step Open

Quick Answer

P1518 Isuzu indicates Commanded Versus Actual Throttle Position Correlation Large Step Open. Common causes include Faulty Throttle Valve Motor, Throttle Valve Motor harness is open or shorted, Throttle Valve Motor 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: P1518 Isuzu indicates Commanded Versus Actual Throttle Position Correlation Large Step Open.
Common causes: Common causes include Faulty Throttle Valve Motor, Throttle Valve Motor harness is open or shorted, Throttle Valve Motor 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 3,920

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

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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
FAQs
Comments
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Code P1518 Isuzu Description

OBDII Code P1518 Isuzu - Commanded Versus Actual Throttle Position Correlation Large Step Open - AutoCodes.com — P1518 Isuzu Code - Commanded Versus Actual Throttle Position Correlation Large Step Open

What does this mean?

What are the Possible Causes of the DTC P1518 Isuzu?

Faulty Throttle Valve Motor
Throttle Valve Motor harness is open or shorted
Throttle Valve Motor circuit poor electrical connection

How to Fix the DTC P1518 Isuzu?

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 Isuzu 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 P1518 Isuzu Code

1. What does the OBDII code P1518 for Isuzu mean?

The code P1518 indicates a discrepancy between the commanded and actual throttle position, specifically detecting a large step open condition.

2. What are some common symptoms of a P1518 error code on an Isuzu vehicle?

Common symptoms may include reduced engine power, hesitation or jerking during acceleration, and the illumination of the Check Engine Light.

3. What are the possible causes of a P1518 code on an Isuzu?

Possible causes include a faulty throttle position sensor (TPS), issues with the throttle actuator control module, wiring or connection problems, or a malfunction in the throttle body.

4. How can I diagnose a P1518 error code on my Isuzu?

Diagnosis typically involves checking the throttle position sensor for proper operation, inspecting the throttle body and related components for any issues, and scanning the vehicle's onboard computer for additional trouble codes.

5. Can a P1518 error code on an Isuzu be fixed at home?

Depending on the root cause, some DIY enthusiasts may be able to address a P1518 code at home by replacing the faulty components, such as the TPS or throttle body, and clearing the error code with an OBDII scanner.

6. Is it safe to drive with a P1518 code on my Isuzu?

It is not recommended to drive with a P1518 code present, as it can lead to poor engine performance and potential safety hazards. It is best to address the issue promptly.

7. How much does it cost to repair a P1518 error code on an Isuzu?

The cost of repairing a P1518 code can vary depending on the specific cause and the labor rates of the repair shop. It is advisable to obtain quotes from different mechanics for an accurate estimate.

8. What should I do if I encounter a P1518 error code intermittently on my Isuzu?

Intermittent P1518 codes may indicate a loose connection or a sporadic issue. It is recommended to have the vehicle thoroughly inspected to prevent potential long-term damage.

9. Can a P1518 code on an Isuzu be related to other engine problems?

While the P1518 code specifically relates to the throttle position correlation, it can sometimes be linked to other engine issues such as vacuum leaks, fuel delivery problems, or ignition system malfunctions.

10. How long does it take to repair a P1518 error code on an Isuzu?

The repair time for a P1518 code can vary depending on the cause and the complexity of the repair. Simple fixes like replacing a sensor may take a few hours, while more involved repairs could require more time.