LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2012 >> SX4 LE, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Immobilizer Control System) >> Diagnostic Information and Procedures >> DTC P1621: Immobilizer Communication Line Error >> Detecting Condition and Trouble Area
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Detecting Condition and Trouble Area

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
P1621: DETECTING CONDITION AND TROUBLE AREA

Detecting Condition Trouble Area
Communication error between ICM and ECM.
  • Related fuse(s) blown
  • Poor connection at ICM connector
  • Poor connection at ECM connector
  • Power supply circuit
  • Ground circuit
  • Communication circuits between ICM and ECM
  • ICM
  • ECM