OBD
P074B
Unable To Engage Gear 3
What it means
P074B means Unable To Engage Gear 3.
Check these first
- Low or dirty transmission fluid
- A failed shift solenoid for third
- A faulty transmission range sensor
- A TCM command fault
- A sticking valve body
What to do next
- Check the fluid level and condition
- Read the range sensor in drive
- Command third gear on a scan tool
- Test the shift solenoid for operation
- Replace the solenoid or range sensor if engagement fails
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.