P0789 OBD-II: Shift Timing Solenoid "A" Intermittent

P0789 Severity

Urgent

Should you fix P0789 yourself?

Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.

Proper diagnosis will save you time and money on unnecessary repairs.

Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.

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What causes OBD-II fault code P0789?

The Transmission Control Module (TCM) uses shift solenoids to control the hydraulic pressure in the transmission which is needed to apply the various clutch packs in the transmission that provide the different gear ratios needed to efficiently propel the vehicle down the roadways. When the TCM detects a shift solenoid is not performing as desired, it will set code P0789.

OBD II Fault Code

OBD II P0789

OBD-II Code Transmission may not shift properly is defined as a Shift Timing Solenoid "A" Intermittent

Transmission may not shift properly Symptoms

Increased fuel consumption
Transmission may not shift properly

Common Problems That Trigger the P0789 Code

Transmission Control Module (TCM) failure
Transmission fluid level is low
Transmission shift solenoid failure
Transmission valve body failure
Wiring issue

OBD Code Resources

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OBD II Fault Code

OBD II P0789

OBD-II Code Transmission may not shift properly is defined as a Shift Timing Solenoid "A" Intermittent

Transmission may not shift properly Symptoms

Increased fuel consumption
Transmission may not shift properly

Common Problems That Trigger the P0789 Code

Transmission Control Module (TCM) failure
Transmission fluid level is low
Transmission shift solenoid failure
Transmission valve body failure
Wiring issue

P0789 OBD-II: Shift Timing Solenoid "A" Intermittent

Should you fix P0789 yourself?

What causes OBD-II fault code P0789?

Need a P0789 diagnosis? Trust our experts.

OBD II Fault Code

Transmission may not shift properly Symptoms

Common Problems That Trigger the P0789 Code

OBD Code Resources

Ask our experts about P0789.

Other OBD-II Codes

OBD II Fault Code

Transmission may not shift properly Symptoms

Common Problems That Trigger the P0789 Code