CAS-DME comm error — CAS module unable to authorize start
BMW diagnostic code. Below: what it means, common causes, symptoms, and the exact bench-programming fix path.
Common causes
- •CAS module failure or EEPROM corruption
- •Donor CAS without proper virginization
- •CAS-DME ISN mismatch (CAS3+/CAS4)
- •Damaged CAS connector
Symptoms you'll see
- •Engine cranks but no start
- •"Drive readiness" warning
- •CAS-related faults in INPA/ISTA
The fix path
Ship the CAS module (2006-2012 BMW only). BMW CAS Key Programming ($150) covers re-pairing, virginization, and new key cutting. For 2013+ F-chassis, see FEM/BDC service.
AML services that fix this
Mail in the affected module, we bench-program, ship back next business day. Flat pricing, flat-rate return shipping at checkout.
BMW CAS Module Key Programming (2006-2012)
$150Lost every BMW key, or the car stopped recognizing the one you have? Ship your CAS module — we program a new working key. Covers CAS2, CAS3, CAS3+, CAS4.
Service detailsBMW FEM/BDC Key Programming
$150Lost the keys to your F-chassis BMW? Ship your FEM/BDC module AND DME — we program a new working key.
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Text us your year/make/model + which scanner caught the code — we'll tell you exactly which module to ship and which service to pick.