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.
High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
Most likely causes
- Vacuum loss in tank double-wall
- Insulation material aged
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It affects emissions.
What each character of P2CDA means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- C: Subsystem depends on the code range
- DA: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2CDA?
If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
What causes code P2CDA?
The most common causes are: vacuum loss in tank double-wall; insulation material aged.
Sources
- github.com: dtc database
- en.wikipedia.org: Alternative fuel vehicle
- en.wikipedia.org: Compressed natural gas
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.