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Engine-Codes – Generic – P0789

P0789 Code - Shift/Timing Solenoid Intermittent

Quick Answer

The P0789 diagnostic trouble code (DTC) refers to a Shift/Timing Solenoid Intermittent issue within the vehicle's transmission system. Common causes include Faulty shift solenoid, Wiring or connector issues in the solenoid circuit, Low transmission fluid levels or contaminated fluid. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0789 indicates Shift/Timing Solenoid Intermittent.
Common causes
Common causes include Faulty shift solenoid, Wiring or connector issues in the solenoid circuit, Low transmission fluid levels or contaminated fluid.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0789 Description

The P0789 diagnostic trouble code (DTC) refers to a Shift/Timing Solenoid Intermittent issue within the vehicle's transmission system. This code indicates that there is a problem with the transmission shift solenoid or its associated circuits, causing intermittent malfunctions. The shift solenoid is responsible for controlling the flow of transmission fluid to engage the gears, allowing the vehicle to shift smoothly between gears. When this solenoid fails to operate correctly or experiences intermittent issues, it can lead to erratic shifting patterns, poor performance, and potential damage to the transmission system.

OBDII Code P0789 - Shift/Timing Solenoid Intermittent
P0789 Code - Shift/Timing Solenoid Intermittent

Common Causes of P0789

  1. Faulty shift solenoid
  2. Wiring or connector issues in the solenoid circuit
  3. Low transmission fluid levels or contaminated fluid
  4. Mechanical problems within the transmission, such as worn clutches or valves
  5. Electronic control module (ECM) malfunction

Symptoms of P0789

  1. Erratic shifting behavior, such as delayed or harsh gear changes
  2. Transmission slipping or difficulty engaging gears
  3. Check engine light illuminated on the dashboard
  4. Reduced fuel efficiency
  5. Limp mode activation

How to Fix P0789

  1. Diagnose the issue by performing a comprehensive transmission scan to identify the specific cause of the problem.
  2. Inspect the shift solenoid and its wiring harness for any signs of damage or corrosion.
  3. Replace the faulty shift solenoid if necessary, ensuring it is correctly installed and calibrated.
  4. Check and refill the transmission fluid to the correct level and quality, addressing any leaks or contamination.
  5. Clear the DTC codes and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P0789

The typical repair costs for addressing a P0789 Shift/Timing Solenoid Intermittent code can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the repair for this problem can range from $200 to $500, including parts and labor. However, it's essential to note that the actual costs may differ based on the location, vehicle make and model, and the labor rates charged by the auto repair shop. It is advisable to consult with a qualified mechanic or service center to obtain an accurate estimate for addressing this transmission issue.

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Code P0789 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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