AutoCodes – Generic – P1A18

P1A18 Code - Variable Voltage Controller Inductor Temperature Sensor Circuit

Quick Answer

This code sets when a variable voltage controller inductor temperature sensor is out of range or indicates a temperature higher than a calibrated threshold. Common causes include Faulty Variable Voltage Controller Inductor Temperature Sensor, Variable Voltage Controller Inductor Temperature Sensor harness is open or shorted, Variable Voltage Controller Inductor Temperature Sensor 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: P1A18 indicates Variable Voltage Controller Inductor Temperature Sensor Circuit.
Common causes: Common causes include Faulty Variable Voltage Controller Inductor Temperature Sensor, Variable Voltage Controller Inductor Temperature Sensor harness is open or shorted, Variable Voltage Controller Inductor Temperature Sensor 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 1,694

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 Feb 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A18 Description

This code sets when a variable voltage controller inductor temperature sensor is out of range or indicates a temperature higher than a calibrated threshold.

OBDII Code P1A18 - Variable Voltage Controller Inductor Temperature Sensor Circuit - AutoCodes.com — P1A18 Code - Variable Voltage Controller Inductor Temperature Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P1A18?

Faulty Variable Voltage Controller Inductor Temperature Sensor
Variable Voltage Controller Inductor Temperature Sensor harness is open or shorted
Variable Voltage Controller Inductor Temperature Sensor circuit poor electrical connection

How to Fix the DTC P1A18?

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 P1A18 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 P1A18 code?

Need more information on how to fix the P1A18 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A18 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1A18 Ford — Variable Voltage Controller Inductor Temperature Sensor Circuit
P1A18 Lincoln — Variable Voltage Controller Inductor Temperature Sensor Circuit
P1A18 Mercury — Variable Voltage Controller Inductor Temperature Sensor Circuit

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 P1A18 Code

1. What are common symptoms of OBDII code P1A18 (Variable Voltage Controller Inductor Temperature Sensor Circuit)?

- Common symptoms include the check engine light illuminating, reduced engine performance, and potentially poor fuel efficiency.

2. What are possible causes of OBDII code P1A18?

- Possible causes include a faulty variable voltage controller inductor temperature sensor, wiring issues, or a problem with the PCM (powertrain control module).

3. How can I diagnose the issue related to code P1A18?

- Diagnosing the issue involves using an OBDII scanner to read the code, performing a visual inspection of the sensor and its wiring, and testing the sensor's resistance and voltage output.

4. Can I continue driving with OBDII code P1A18 present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the vehicle and potentially affect overall performance.

5. How can I repair OBDII code P1A18?

- Repairing this code may involve replacing the variable voltage controller inductor temperature sensor, repairing any damaged wiring, or resetting the PCM after fixing the issue.

6. Are there any DIY tips for addressing OBDII code P1A18?

- DIY tips include checking for loose or damaged wiring around the sensor, ensuring proper sensor connections, and consulting the vehicle's repair manual for specific troubleshooting steps.

7. How much does it typically cost to repair OBDII code P1A18 at a mechanic's shop?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can a faulty variable voltage controller inductor temperature sensor affect other vehicle systems?

- Yes, a faulty sensor can potentially affect other vehicle systems that rely on temperature readings for proper operation, such as the engine management system.

9. Will resetting the check engine light make OBDII code P1A18 disappear permanently?

- Resetting the check engine light without addressing the underlying issue will not make the code disappear permanently; it is crucial to diagnose and fix the root cause.

10. Is it possible for OBDII code P1A18 to reappear after repair?

- If the root cause of the issue is not properly addressed during repair, the code may reappear. It is essential to ensure that the sensor and related components are functioning correctly to prevent recurrence.