C2318 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 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.
Code C2318 Description
What are the Possible Causes of the DTC C2318?
- 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?
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 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 code?
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Need Help with the Code?
Get the C2318 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C2318 Lexus — Low Voltage Error Power Supply Malfunction
- C2318 Toyota — Low Voltage Error Power Supply Malfunction
Frequently Asked Questions about C2318 Code
1. What are the common symptoms of OBDII code C2318 (Low Voltage Error Power Supply Malfunction)?
- Common symptoms include rough idle, misfires, poor acceleration, and illuminated warning lights on the dashboard.
2. What are some possible causes of OBDII code C2318?
- Possible causes include a faulty power supply to the vehicle's control modules, wiring issues, or a problem with the control module itself.
3. How can I diagnose the root cause of OBDII code C2318?
- Diagnosis typically involves checking the power supply voltage with a multimeter, inspecting the wiring for any damage or corrosion, and testing the control module for proper functioning.
4. Can a low vehicle battery voltage trigger OBDII code C2318?
- Yes, a low battery voltage can potentially trigger this code as it can affect the overall power supply to the control modules in the vehicle.
5. Are there any quick repair tips for resolving OBDII code C2318?
- Quick repair tips may include checking and replacing any blown fuses related to the control modules, ensuring proper battery voltage, and addressing any wiring issues.
6. Is it safe to continue driving my vehicle with OBDII code C2318 present?
- It is not recommended to continue driving with this code present, as it can lead to further damage to the vehicle's components and potentially affect drivability.
7. Can resetting the OBDII codes clear C2318 temporarily?
- Resetting the OBDII codes may clear the code temporarily, but it is important to address the underlying issue causing the code to prevent it from reoccurring.
8. How much does it typically cost to repair OBDII code C2318 at a mechanic or dealership?
- The cost of repair can vary depending on the specific cause of the code, but it may range from $100 to $500 or more, including diagnosis and parts.
9. Will OBDII code C2318 cause my vehicle to fail an emissions test?
- Yes, if this code is present during an emissions test, it may cause your vehicle to fail due to potential issues with the power supply affecting emissions control systems.
10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code C2318?
- Depending on the root cause, a DIY enthusiast with basic knowledge may be able to address this code by checking power supply connections, fuses, and wiring before seeking professional help if needed.
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