P1633 — Immobilizer power supply fault
Universal diagnostic code. Below: what it means, common causes, symptoms, and the exact bench-programming fix path.
Common causes
- •IMMO module power fault
- •Wiring/fuse issue
- •Internal voltage regulator failed
Symptoms you'll see
- •Crank-no-start
- •Intermittent operation
- •IMMO warnings random
The fix path
Verify power + ground at the immobilizer module first. If module itself is failed: bench repair or replace via the brand-appropriate service.
AML services that fix this
Mail in the affected module, we bench-program, ship back next business day. Flat pricing, return shipping included.
VW/Audi MED17/ME17 IMMO Delete + VIN
$250Permanently remove immobilizer coding from MED17/ME17 ECUs. Optional VIN correction.
Service detailsBMW CAS Module Key Programming (2006-2012)
$150Ship your BMW CAS module — we program a new working key. Covers CAS2, CAS3, CAS3+, CAS4.
Service detailsMercedes EIS Cloning (Pre-2014)
$250Clone a working Mercedes EIS to a replacement EIS — keeps your existing keys.
Service detailsRelated diagnostic codes
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.