OBD-II code · Powertrain (generic)
P0618 Alternative Fuel Control Module KAM Error
The control module for alternative fuel (CNG, LPG, hydrogen) reports a Keep-Alive-Memory error - persistent calibration values are corrupt or unreadable. Adaptive learning is reset.
Is it safe to drive with P0618?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyKAM contents corrupted
- Less likelyModule software outdated, reflash may resolve
- Less likelySupply voltage outside specification
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Alternative Fuel Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.