BMW · DTC LOOKUP
FEM ISN mismatch — BMW F-chassis FEM/BDC ISN doesn't match DME
BMW diagnostic code. Below: what it means, common causes, symptoms, and the exact bench-programming fix path.
Common causes
- •FEM/BDC replaced without ISN match
- •DME replaced without ISN match
- •Donor module installed
- •Failed coding attempt
Symptoms you'll see
- •F-chassis BMW won't start
- •FEM-DME comm errors
- •New keys can't be programmed
The fix path
BMW FEM/BDC Key Programming ($150) — ship FEM/BDC + DME together. We read the DME's ISN, write to FEM, then pair a fresh key.
AML services that fix this
Mail in the affected module, we bench-program, ship back next business day. Flat pricing, return shipping included.
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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 DMECAS-DME comm errorCAS module unable to authorize startBMW E46 cluster pixel lossBMW E38/E39/E46 instrument cluster pixel dropoutsNot 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.