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.
DTC P1690: Immobilizer-Smarter No Response: General Description
The VMCU controls the Drive motor, in a normal way for starting and running, and starts communication with the Smart Key Unit, sending a PIN request to the Smart Key Unit and waiting for valid release message from it until the release time period has ended. In case of Smart Key Unit immobilizer function is locked, the Smart Key Unit answer is the no release message.
VMCU enters in the locked state, which causes the activation of the immobilization actions of the engine. In case of Smart Key Unit immobilizer function state is released, the Smart Key Unit answer is the release message, including the information Smart Key Unit in learn mode and the PIN code.
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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.