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 B1493: Generator "F" Terminal High: Description
DTC B1493 will set when a fault exists that is causing generator "F" terminal to read HIGH continuously. This DTC will be set when engine is running, and PCM is sending "engine RPM is zero" and "generator PWM is equal to or greater than 64 percent duty cycle" class 2 data messages for 30 seconds. When DTC B1493 is set, VOLTS indicator will illuminate. DTC B1493 can be cleared using scan tool, or history DTC will disappear after 100 ignition cycles if fault conditions do not reoccur.
DTC B1493 will set when a fault exists that is causing generator "F" terminal to read HIGH continuously. This DTC will be set when engine is running, and PCM is sending "engine RPM is zero" and "generator PWM is equal to or greater than 64 percent duty cycle" class 2 data messages for 30 seconds. When DTC B1493 is set, VOLTS indicator will illuminate. DTC B1493 can be cleared using scan tool, or history DTC will disappear after 100 ignition cycles if fault conditions do not reoccur.
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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.