AutoCodes – Lexus – C2318 Lexus

C2318 Lexus Code - Low Voltage Error Power Supply Malfunction

Quick Answer

The Auxiliary Battery voltage is applied to terminal +B when the power switch is on (IG). Common causes include Faulty Auxiliary Battery, HEV Fuse, IGCT Relay. 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: C2318 Lexus indicates Low Voltage Error Power Supply Malfunction.
Common causes: Common causes include Faulty Auxiliary Battery, HEV Fuse, IGCT Relay.
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 1,017

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2318 Lexus Description

The Auxiliary Battery voltage is applied to terminal +B when the power switch is on (IG). The Transmission Control ECU outputs this Diagnostic Trouble Code (DTC) when the input voltage drops

OBDII Code C2318 Lexus - Low Voltage Error Power Supply Malfunction - AutoCodes.com — C2318 Lexus Code - Low Voltage Error Power Supply Malfunction

What does this mean?

What are the Possible Causes of the DTC C2318 Lexus?

Faulty Auxiliary Battery
HEV Fuse
IGCT Relay
Auxiliary Battery harness is open or shorted
Auxiliary Battery circuit poor electrical connection

How to Fix the DTC C2318 Lexus?

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 C2318 Lexus 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 C2318 Lexus code?

Need more information on how to fix the C2318 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2318 Lexus code diagnosed by a professional: Find a repair shop in your area

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 C2318 Lexus Code

1. What are the common symptoms of OBDII code C2318 in a Lexus related to low voltage error power supply malfunction?

The common symptoms include dashboard warning lights illuminating, power steering failure, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code C2318 in a Lexus indicating a power supply malfunction?

Potential causes include a faulty power steering control module, damaged wiring or connectors, a weak battery, or issues with the vehicle's electrical system.

3. How can I diagnose the OBDII code C2318 in a Lexus for a low voltage error power supply malfunction?

Diagnosis involves using a diagnostic scan tool to read the code, checking the power steering system for faults, inspecting wiring and connectors for damage, and testing the battery and electrical components.

4. What are some repair tips for addressing the OBDII code C2318 in a Lexus related to low voltage error power supply malfunction?

Repair tips may include repairing or replacing damaged wiring, connectors, or components, resetting the power steering system, testing and replacing the battery if needed, and clearing the fault code with a scan tool.

5. Can I continue driving my Lexus with the OBDII code C2318 indicating a power supply malfunction?

It is not recommended to drive the vehicle with this code present, as it can lead to potential safety hazards and further damage to the power steering system.

6. How urgent is it to address the OBDII code C2318 in a Lexus signaling a low voltage error power supply malfunction?

It is essential to address this issue promptly to avoid potential power steering failure, loss of vehicle control, and further damage to electrical components.

7. What are the typical costs associated with repairing OBDII code C2318 in a Lexus due to a power supply malfunction?

Costs can vary depending on the exact cause of the issue, but expenses may include parts replacement, labor costs, diagnostic fees, and possibly recalibration of the power steering system.

8. Can I reset the OBDII code C2318 in a Lexus myself after addressing the power supply malfunction issue?

If you have the necessary tools and knowledge, you may be able to reset the code yourself using a diagnostic scan tool or by disconnecting the vehicle's battery for a short period.

9. Are there any preventive measures I can take to avoid encountering the OBDII code C2318 related to a power supply malfunction in my Lexus?

Regularly inspecting the power steering system, maintaining the vehicle's electrical components, ensuring a healthy battery, and addressing any warning signs promptly can help prevent this issue.

10. Should I seek professional help to address the OBDII code C2318 in my Lexus, or can I attempt the repairs myself?

It is recommended to seek professional assistance, especially if you are not experienced in diagnosing and repairing automotive electrical issues, to ensure the problem is properly diagnosed and resolved.