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, flat-rate return shipping at checkout.
VW/Audi MED17/ME17 IMMO Delete + VIN
$250Engine swap or standalone build blocked by the immobilizer? We permanently remove the immobilizer coding from your MED17/ME17 ECU so it runs on its own. Optional VIN correction.
Service detailsBMW 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 detailsMercedes EIS Cloning (Pre-2014)
$250Failed Mercedes EIS leaving you with a car that won't start? We clone it to a replacement EIS — your existing keys keep working, no re-keying the car.
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.