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DTC P1621 [L3]

BME010201600W04

DTC P1621 | Code word does not match after engine cranking
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DETECTION CONDITION | • Code words stored in PCM and immobilizer unit do not match
POSSIBLE CAUSE | • Immobilizer system reprogram procedure (code word) was not performed correctly after replacing immobilizer unit or PCM.

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [L3].) • Is same DTC present? | Yes | Perform code word reprogram procedure, go to next step.
No | Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3].) Then go to next step.
2 | VERIFY TROUBLESHOOTING OF DTC P1621 COMPLETED • Clear DTC from memory using WDS or equivalent. • Perform KOEO self-test. (See KOEO/KOER SELF-TEST PROCEDURE [L3].) • Is same DTC present? | Yes | Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [L3].)
No | Go to next step.
3 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present? | Yes | Go to applicable DTC troubleshooting. (See DTC TABLE [L3].)
No | Troubleshooting completed.