What causes P1721 on a Ford?

Slipping forward clutch Low line pressure Failed first-gear solenoid circuit Faulty input or output speed sensor Low fluid level

How do I fix P1721 on a Ford?

Check fluid level and condition Compare input and output speeds in first gear Test line pressure Verify speed sensor accuracy Overhaul first-gear components if slip is confirmed

P1721 Gear 1 Incorrect Ratio

Q: What does P1721 mean on a Ford?

P1721 — Gear 1 Incorrect Ratio. Applies to F-150, Explorer, Ranger with electronic automatics.

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: F-150, Explorer, Ranger with electronic automatics

What does P1721 mean on a Ford?

P1721 — Gear 1 Incorrect Ratio. This Ford-enhanced code applies to F-150, Explorer, Ranger with electronic automatics.

Common causes of P1721

Slipping forward clutch
Low line pressure
Failed first-gear solenoid circuit
Faulty input or output speed sensor
Low fluid level

How to fix P1721

Check fluid level and condition
Compare input and output speeds in first gear
Test line pressure
Verify speed sensor accuracy
Overhaul first-gear components if slip is confirmed