Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUZUKI2013SX4 CROSSOVER, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSIMMOBILIZER CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC P1645: ID CODE COMMUNICATION ERRORTROUBLESHOOTING
2013 Suzuki SX4 Crossover, Automatic CVT Trans
DTC P1645: ID Code Communication Error: Troubleshooting
2013 Suzuki SX4 Crossover, Automatic CVT TransSECTION Troubleshooting
P1645: TROUBLESHOOTING CHART
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | Was "Immobilizer Control System Check" performed? | Go to Step 2. | Go to IMMOBILIZER CONTROL SYSTEM CHECK . |
| 2 | DTC check of ECM
Is DTC U0073, U0101, U0121, U0140 and/or U0155 detected? |
Go to applicable DTC troubleshooting. | Go to Step 3. |
| 3 | CAN communication circuit check
Is each CAN communication circuit in good condition? |
Replace ID controller with new one. If DTC P1645 is still detected, substitute a known-good ECM and recheck. | Repair circuit. |
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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.