Code P1645
Powertrain DTCs Available in Another Module
What does code P1645 mean?
The OBD-II diagnostic code P1645 is triggered when your vehicle's Engine Control Unit (ECU) detects an issue described as: "Powertrain DTCs Available in Another Module".
This is a generic powertrain code, which means it applies to most makes and models manufactured since 1996. However, the exact repair steps, severity, and cost can vary radically depending on whether you drive a Ford, Toyota, BMW, or any other brand.
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To read the telemetry, identify this fault, and clear the check engine light yourself, you need to connect an OBD2 Bluetooth scanner to your car.
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