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 may lose calibration or settings, leading to improper fuel control, reduced performance, and potential stalling.
1. Most Common Causes
- Faulty alternative fuel control module
- Battery voltage issues (low or intermittent)
- Corroded or loose wiring/connectors to the module
- Blown fuse or relay for the module
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine stalling or rough idle when running on alternative fuel
- Reduced fuel economy or power
- Difficulty switching between fuel types
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and document freeze frame data.
Step 2: Inspect battery voltage and charging system; ensure battery is fully charged and connections are clean.
Step 3: Visually check wiring and connectors to the alternative fuel control module for damage, corrosion, or looseness.
Step 4: Test the module's power and ground circuits with a multimeter.
Step 5: If all checks pass, replace the alternative fuel control module and reprogram if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may stall or lose power unexpectedly, especially when running on alternative fuel, posing a safety risk.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Module replacement can range from $200-$800 depending on the vehicle and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.