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Engine-Codes – Generic – P0618

P0618 Code - Alternative Fuel Control Module KAM Error

Quick Answer

The P0618 diagnostic trouble code (DTC) indicates an issue with the Alternative Fuel Control Module Keep Alive Memory (KAM) error. Common causes include Faulty alternative fuel control module, Damaged wiring or connectors, Weak or dead battery. 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
P0618 indicates Alternative Fuel Control Module KAM Error.
Common causes
Common causes include Faulty alternative fuel control module, Damaged wiring or connectors, Weak or dead battery.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P0618 Description

The P0618 diagnostic trouble code (DTC) indicates an issue with the Alternative Fuel Control Module Keep Alive Memory (KAM) error. This error occurs when the module responsible for controlling the vehicle's alternative fuel system, such as a propane or natural gas system, is unable to retain its memory for various reasons. The KAM error can result in the module not functioning properly, leading to issues with fuel delivery and combustion efficiency.

OBDII Code P0618 - Alternative Fuel Control Module KAM Error
P0618 Code - Alternative Fuel Control Module KAM Error

Common Causes of P0618

  1. Faulty alternative fuel control module
  2. Damaged wiring or connectors
  3. Weak or dead battery
  4. Software glitch
  5. Corrosion or moisture damage

Symptoms of P0618

  1. Poor fuel economy
  2. Rough idling
  3. Hesitation during acceleration
  4. Stalling
  5. Check engine light illuminated

How to Fix P0618

  1. Perform a diagnostic scan to retrieve the P0618 code and identify the specific cause of the KAM error.
  2. Inspect the alternative fuel control module, wiring, and connectors for any damage or corrosion.
  3. Test the battery voltage to ensure it is within the proper range for operation.
  4. Update the module's software if necessary to address any glitches or programming issues.
  5. Clear the code and reset the vehicle's computer system to see if the issue has been resolved.

Cost to Fix P0618

The cost of repairing a P0618 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor to address this problem. Keep in mind that prices may fluctuate based on the vehicle make and model, the extent of the repairs needed, and the mechanic's hourly rates. It is advisable to obtain quotes from multiple auto repair shops to ensure you are getting a fair price for the necessary repairs.

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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 P0618 Code

1. What does OBDII code P0618 mean?

P0618 indicates a "Alternative Fuel Control Module KAM (Keep-Alive Memory) Error," meaning there’s a problem with the module’s ability to retain critical data when the vehicle is off.

2. What are the common symptoms of code P0618?

Symptoms may include the check engine light turning on, poor fuel efficiency, alternative fuel system malfunctions, or rough engine performance.

3. What causes code P0618 to trigger?

This code can be caused by a dead or weak vehicle battery, faulty Alternative Fuel Control Module, wiring or connector issues, or software corruption in the control module.

4. Can a weak battery cause the P0618 code?

Yes, a weak or failing battery can cause the module to lose its Keep-Alive Memory, leading to this code.

5. How do you diagnose P0618?

Diagnosis involves checking the battery’s voltage, inspecting wiring and connectors to the Alternative Fuel Control Module, and testing the module itself for faults.

6. Is it safe to drive with code P0618?

It may be safe to drive short-term, but ignoring the issue could worsen fuel efficiency or cause drivability problems, especially if the alternative fuel system is compromised.

7. How do you fix the P0618 error?

Repairs may involve replacing the battery, repairing wiring or connectors, reprogramming the Alternative Fuel Control Module, or replacing the module entirely.

8. Can software updates fix code P0618?

Yes, in some cases, reprogramming or updating the module's software can resolve the issue if it’s caused by corrupted data.

9. How much does it cost to repair code P0618?

Repair costs vary but typically range from $100 to $500 depending on whether the issue is a simple wiring repair or a module replacement.

10. Can resetting the code fix the issue permanently?

Clearing the code may temporarily turn off the check engine light, but the issue will likely return unless the underlying problem is resolved.

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