OBD Guide
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P0633

Immobilizer Key Not Programmed - ECM/PCM

P0633 is an OBD-II diagnostic trouble code meaning: Immobilizer Key Not Programmed - ECM/PCM. Common causes: using an unprogrammed key, installing a used ecu without reprogramming the immobilizer. Estimated repair cost: $22–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–167 (est.)

Symptoms

  • The Check Engine light and immobilizer light come on
  • The engine does not start or starts and immediately stalls
  • The immobilizer indicator on the instrument panel is flashing
  • The problem occurs after replacing the ECU or key
  • All the keys suddenly stopped working

Causes

  • Using an unprogrammed key
  • Installing a used ECU without reprogramming the immobilizer
  • Damage to the immobilizer memory in the ECU
  • Random reset of the key database during reprogramming
  • Malfunction of the immobilizer antenna (coil in the ignition switch)

How to Fix

  1. Make sure you are using the correct key for the vehicle.
  2. Check the immobilizer antenna (coil around the ignition switch)
  3. Try the second key - if available
  4. Key programming via dealer scanner
  5. When installing a used ECU - complete immobilizer binding procedure
  6. Contact an authorized dealer if you do not have working keys

Related codes

P0630P0631P0632P1260P1610

Error P0633 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0633 code mean?

P0633 is an OBD-II diagnostic trouble code that indicates: Immobilizer Key Not Programmed - ECM/PCM

What causes a P0633 error code?

The most common causes of P0633 include: Using an unprogrammed key; Installing a used ECU without reprogramming the immobilizer; Damage to the immobilizer memory in the ECU; Random reset of the key database during reprogramming.

How do I fix a P0633 diagnostic trouble code?

To fix P0633: Make sure you are using the correct key for the vehicle.. Check the immobilizer antenna (coil around the ignition switch). Try the second key - if available. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0633?

Yes, but get it checked soon

How much does it cost to fix P0633?

The estimated repair cost for P0633 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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