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Engine-Codes – Isuzu – P0787 Isuzu

P0787 Isuzu Code - 3-2 Shift Solenoid Control Circuit Low Voltage

Quick Answer

The P0787 code for Isuzu vehicles indicates a problem with the 3-2 Shift Solenoid Control Circuit, specifically detecting low voltage. Common causes include Faulty wiring or connectors in the 3-2 shift solenoid control circuit, Defective 3-2 shift solenoid, Issues with the 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
P0787 Isuzu indicates 3-2 Shift Solenoid Control Circuit Low Voltage.
Common causes
Common causes include Faulty wiring or connectors in the 3-2 shift solenoid control circuit, Defective 3-2 shift solenoid, Issues with the 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 P0787 Isuzu Description

The P0787 code for Isuzu vehicles indicates a problem with the 3-2 Shift Solenoid Control Circuit, specifically detecting low voltage. In an automatic transmission system, solenoids play a crucial role in controlling the flow of transmission fluid to engage different gears. In this case, the 3-2 shift solenoid is responsible for facilitating the transition from third gear to second gear. When the control circuit detects low voltage, it means that there is an issue with the electrical signal being sent to the solenoid, which can result in improper shifting between gears.

OBDII Code P0787 Isuzu - 3-2 Shift Solenoid Control Circuit Low Voltage
P0787 Isuzu Code - 3-2 Shift Solenoid Control Circuit Low Voltage

Common Causes of P0787 Isuzu

  1. Faulty wiring or connectors in the 3-2 shift solenoid control circuit
  2. Defective 3-2 shift solenoid
  3. Issues with the transmission control module (TCM)
  4. Low transmission fluid levels or contaminated fluid
  5. Electrical issues such as a blown fuse or short circuit in the control circuit

Symptoms of P0787 Isuzu

  1. Harsh or delayed shifting between gears
  2. Erratic behavior while driving, such as sudden jerks or surges
  3. Transmission slipping or hesitation
  4. Illumination of the Check Engine Light
  5. Decreased fuel efficiency due to inefficient gear shifting

How to Fix P0787 Isuzu

  1. Begin by diagnosing the specific cause of the low voltage in the 3-2 shift solenoid control circuit using a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the wiring and connectors.
  2. If the issue is traced back to faulty wiring or connectors, repair or replace the damaged components as needed.
  3. Test the 3-2 shift solenoid for proper functionality and replace it if it is found to be defective.
  4. Check the transmission fluid levels and condition, topping up or flushing and replacing the fluid if necessary.
  5. Clear the trouble codes from the vehicle's computer and test drive the vehicle to ensure proper shifting between gears.

Cost to Fix P0787 Isuzu

The cost of repairing a P0787 code for Isuzu vehicles can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair could range from $100 to $300, with labor costs adding another $150 to $300. Keep in mind that these are rough estimates and actual costs may vary. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on your vehicle's make and model.

When is the Code Detected?

Code P0787 is detected when the Engine Control Module (ECM) detects short in solenoid valve ST circuit 4 times when solenoid valve ST is operated

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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.

Frequently Asked Questions about P0787 Isuzu Code

1. What does OBDII code P0787 for Isuzu mean?

The code P0787 on an Isuzu indicates a problem with the 3-2 Shift Solenoid Control Circuit having low voltage.

2. What are the common symptoms of OBDII code P0787 in an Isuzu?

Common symptoms include harsh shifting, delayed or erratic shifting, transmission slipping, and in some cases, the vehicle may go into limp mode.

3. What are the possible causes of OBDII code P0787 in an Isuzu?

Possible causes may include a faulty 3-2 shift solenoid, damaged wiring or connectors in the shift solenoid circuit, low transmission fluid levels, or a malfunctioning transmission control module.

4. How serious is OBDII code P0787 in an Isuzu?

Ignoring this code can lead to further damage to the transmission and potentially leave the vehicle inoperable. It is recommended to address this issue promptly.

5. Can I drive my Isuzu with OBDII code P0787?

It is not recommended to drive the vehicle with this code present as it can cause further damage to the transmission. It is best to have the issue diagnosed and repaired as soon as possible.

6. How can I diagnose OBDII code P0787 in my Isuzu?

Diagnosing this code typically involves using a scan tool to check for other related trouble codes, testing the 3-2 shift solenoid and its circuit for continuity and proper voltage, and inspecting the transmission fluid level and condition.

7. Can I repair OBDII code P0787 in my Isuzu myself?

If you have knowledge and experience working on transmissions, you may be able to repair this issue yourself. However, it is recommended to consult a professional mechanic or a transmission specialist for accurate diagnosis and repair.

8. What is the average cost to repair OBDII code P0787 in an Isuzu?

The cost of repair can vary depending on the underlying cause of the code and the extent of the damage. On average, repairs for this code can range from $200 to $800 or more, including parts and labor.

9. How long does it take to repair OBDII code P0787 in an Isuzu?

The repair time can vary depending on the specific issue causing the code. In most cases, repairing the 3-2 shift solenoid control circuit can take a few hours to a full day, depending on the complexity of the repair.

10. Can resetting the OBDII system clear OBDII code P0787 in an Isuzu?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is best to diagnose the problem and make the necessary repairs to prevent further issues.

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