Code result
P2CDA
Alternative Fuel Tank A Vacuum Insulation Deteriorated
Moderate severity
What it means
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.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Vacuum loss in tank double-wall
highOne of the most commonly reported causes for this code — check this first.
Insulation material aged
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2CDA freeNo credit card required