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Engine-Codes – Generic – P0788

P0788 Code - Shift/Timing Solenoid High

Quick Answer

The P0788 diagnostic trouble code (DTC) refers to a shift/timing solenoid high condition. Common causes include Faulty shift solenoid, Damaged wiring or connectors in the solenoid circuit, Defective transmission control module (TCM). 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
P0788 indicates Shift/Timing Solenoid High.
Common causes
Common causes include Faulty shift solenoid, Damaged wiring or connectors in the solenoid circuit, Defective transmission control module (TCM).
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 11, 2024
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Code P0788 Description

The P0788 diagnostic trouble code (DTC) refers to a shift/timing solenoid high condition. This code is typically found in vehicles with automatic transmissions and indicates a problem with the shift solenoid in the transmission control system. The shift solenoid is responsible for controlling the flow of transmission fluid and engaging/disengaging specific gears to facilitate smooth gear shifting. When the solenoid is stuck in the high position, it can lead to erratic shifting behavior, harsh gear changes, and potential damage to the transmission components.

OBDII Code P0788 - Shift/Timing Solenoid High
P0788 Code - Shift/Timing Solenoid High

Common Causes of P0788

  1. Faulty shift solenoid
  2. Damaged wiring or connectors in the solenoid circuit
  3. Defective transmission control module (TCM)
  4. Low transmission fluid levels
  5. Contaminated transmission fluid

Symptoms of P0788

  1. Delayed or rough shifting
  2. Harsh gear changes
  3. Gear slippage
  4. Poor acceleration
  5. Decreased fuel efficiency

How to Fix P0788

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the shift solenoid, wiring, and TCM to pinpoint the exact cause of the problem.
  2. Replace the shift solenoid: If the shift solenoid is found to be faulty, it will need to be replaced with a new one. This may involve removing the transmission pan to access the solenoid.
  3. Check wiring and connectors: Inspect the wiring and connectors in the solenoid circuit for any damage or corrosion. Repair or replace any faulty components as needed.
  4. Test transmission fluid: Check the transmission fluid level and quality. If it is low or contaminated, perform a transmission fluid flush and refill to ensure proper lubrication and cooling of the transmission components.
  5. Reset the TCM: After completing the repairs, reset the TCM and clear the trouble codes to see if the issue has been resolved.

Cost to Fix P0788

The cost of repairing a P0788 code can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing a shift solenoid can cost between $150 to $400, including parts and labor. Additional costs may apply if there are other components that need to be replaced or repaired. It's advisable to consult with a professional mechanic for a more accurate cost estimate based on your vehicle's make and model. Remember that labor rates at auto repair shops can range between $80 and $150 per hour, so it's essential to factor in these costs when budgeting for repairs.

When is the Code Detected?

Code P0788 is detected when the Engine Control Module (ECM) ECM detects open in solenoid valve ST circuit 4 times when solenoid valve ST is not operated

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Code P0788 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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