OBD
P073F
Unable to Engage Gear 1
What it means
P073F means Unable to Engage Gear 1.
Check these first
- Low or dirty transmission fluid
- A clogged transmission filter
- A failed shift solenoid for first
- A faulty range sensor
- A TCM command fault
What to do next
- Check the fluid level and condition
- Read the range sensor in drive
- Command first gear on a scan tool
- Test the shift solenoid for operation
- Replace the filter or solenoid if engagement still fails
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.