2007 Suzuki SX4 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Immobilizer Control System DTCS

IMMOBILIZER CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Detecting Item Detecting Condition
P1614 Transponder response error Transponder code in transponder built in ignition key cannot be read through ICM.
P1615 Steering lock unit communication error
  • While registering the transponder code in the transponder built in the ignition key in ECM, the keyless start control module sent a signal to ECM indicating that the ID code could not be registered.
  • The ID code could not be registered in the keyless start control module or ECM.
P1616 Unregistered keyless start control module ECM detects different ID codes registered in ECM and keyless start control module.
P1618 Keyless start control module CAN communication error Reception error of communication data for keyless start control module is detected for longer than specified time continuously.
P1621 Immobilizer communication line error Communication error between ICM and ECM.
P1622 EEPROM reading / writing error EEPROM in ECM is corrupted.
P1623 Unregistered transponder Transponder code in the transponder built in the ignition key is invalid.
P1625 Immobilizer antenna error ICM is faulty.
P1636 Immobilizer information registration failure Communication error between ECM and BCM.
P1638 Immobilizer information mismatched
  • Communication error between ECM and BCM.
  • Wrong ECM or BCM is used.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.