Alternative Fuel Tank A Vacuum Insulation Deteriorated
The AFCM detects that the vacuum insulation of alternative fuel tank A has lost effectiveness. Common in cryogenic LNG tanks where loss of vacuum increases boil-off rate.
Affected components
- Alt fuel tank a
- Alt fuel tank a insulation
Common causes
- High likelihood: Vacuum loss in tank double-wall
- Medium likelihood: Insulation material aged
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.