P1789 3 2 Timing Coast Clutch Solenoid Circuit Shorted Conditions

OBD2 Code: P1789

Description: 3-2 Timing Coast Clutch Solenoid Circuit Shorted

Definition: This code indicates that there is a short circuit in the solenoid circuit responsible for controlling the timing of the coast clutch during a 3-2 downshift in an automatic transmission. The issue may be due to wiring problems, a faulty solenoid, or other electrical issues within the transmission system.

P1789 – 3-2 Timing Coast Clutch Solenoid Circuit Shorted Conditions

Typical Severity: Severe

Common Causes

P1789 – 3-2 Timing Coast Clutch Solenoid Circuit Shorted Conditions

Common Causes:

• Faulty 3-2 timing coast clutch solenoid
• Short circuit in the wiring harness of the solenoid
• Corroded or damaged connectors related to the solenoid circuit
• Issues with the transmission control module (TCM)

 

Common Misdiagnosis

OBD2 Code: P1789

Description: 3-2 Timing Coast Clutch Solenoid Circuit Shorted Conditions

Common Misdiagnosis: Faulty transmission control module (TCM) instead of checking the solenoid circuit for shorts or wiring issues.

 

Common Diagnostic Steps

OBD2 Code: P1789

Description: 3-2 Timing Coast Clutch Solenoid Circuit Shorted Conditions

• Check the transmission fluid level and condition.
• Inspect the wiring harness and connectors for damage or corrosion.
• Test the solenoid circuit for continuity and shorts using a multimeter.
• Verify the power supply to the solenoid is within specifications.
• Use a scan tool to monitor live data and check for any related codes.
• If necessary, replace the faulty solenoid or repair damaged wiring/connectors.