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BMW · DTC LOOKUP

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, return shipping included.

BMW CAS Module Key Programming (2006-2012)

$150

Ship your BMW CAS module — we program a new working key. Covers CAS2, CAS3, CAS3+, CAS4.

Service details

BMW FEM/BDC Key Programming

$150

Ship your BMW FEM/BDC module AND DME — we program a new working key.

Service details

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Related diagnostic codes

P1570Engine Start Blocked by ImmobilizerP0513Incorrect Immobilizer KeyFRM/FRM3 not detectedBMW FRM/FRM3 Footwell Module unresponsiveEWS-DME comm errorEWS module not authenticating with DMEBMW E46 cluster pixel lossBMW E38/E39/E46 instrument cluster pixel dropoutsBMW DDE immobilizer faultBMW diesel DDE immobilizer authentication failure

Not sure which service applies?

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.

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