Alternative Fuel Control Module KAM Error
The P0618 code indicates a Keep Alive Memory (KAM) error in the Alternative Fuel Control Module. This module manages the operation of alternative fuel systems (e.g., CNG, LPG, ethanol). The KAM stores adaptive learning data; when it fails, the module loses calibration and may default to a backup strategy, causing drivability issues.
01. Most Common Causes
- Faulty alternative fuel control module
- Corroded or damaged wiring/connectors to the module
- Low battery voltage or poor electrical connections
- Software glitch or corrupted memory in the module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine running poorly on alternative fuel
- Reduced fuel economy or power
- Hard starting or stalling when using alternative fuel
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect wiring and connectors for damage, corrosion, or looseness.
Step 3: Check battery voltage and charging system; ensure stable 12V+.
Step 4: Clear code and test drive; if code returns, replace the alternative fuel control module.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It may be safe for short distances, but the vehicle may experience poor performance or stalling on alternative fuel. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Replacing the module can range from $200-$600 depending on the vehicle and labor.