What causes P1789 on a Ford?

Shorted coast clutch solenoid winding Chafed internal harness shorting the circuit Contaminated fluid bridging solenoid terminals Shorted bulkhead connector TCM driver holding the circuit low

How do I fix P1789 on a Ford?

Check the circuit for shorts to ground Measure solenoid resistance against spec Inspect the internal harness for chafing Check fluid for conductive contamination Replace the solenoid or repair the harness per tests

P1789 3-2 Timing/Coast Clutch Solenoid Circuit Shorted

Q: What does P1789 mean on a Ford?

P1789 — 3-2 Timing/Coast Clutch Solenoid Circuit Shorted. Applies to F-150, Explorer, E-Series with E4OD and 4R100 transmissions.

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: F-150, Explorer, E-Series with E4OD and 4R100 transmissions

What does P1789 mean on a Ford?

P1789 — 3-2 Timing/Coast Clutch Solenoid Circuit Shorted. This Ford-enhanced code applies to F-150, Explorer, E-Series with E4OD and 4R100 transmissions.

Common causes of P1789

Shorted coast clutch solenoid winding
Chafed internal harness shorting the circuit
Contaminated fluid bridging solenoid terminals
Shorted bulkhead connector
TCM driver holding the circuit low

How to fix P1789

Check the circuit for shorts to ground
Measure solenoid resistance against spec
Inspect the internal harness for chafing
Check fluid for conductive contamination
Replace the solenoid or repair the harness per tests