AutoCodes – Isuzu – P1786 Isuzu

P1786 Isuzu Code - Automatic Transmission Poor Gear Shift

Quick Answer

P1786 Isuzu indicates Automatic Transmission Poor Gear Shift. Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), ECM/TCM harness is open or shorted. 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: P1786 Isuzu indicates Automatic Transmission Poor Gear Shift.
Common causes: Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), ECM/TCM harness is open or shorted.
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.

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Code Popularity 1,618

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1786 Isuzu Description

OBDII Code P1786 Isuzu - Automatic Transmission Poor Gear Shift - AutoCodes.com — P1786 Isuzu Code - Automatic Transmission Poor Gear Shift

What does this mean?

What are the Possible Causes of the DTC P1786 Isuzu?

Faulty Engine Control Module (ECM)
Faulty Transmission Control Module (TCM)
ECM/TCM harness is open or shorted
ECM/TCM circuit poor electrical connection

How to Fix the DTC P1786 Isuzu?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1786 Isuzu code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1786 Isuzu code?

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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 P1786 Isuzu Code

1. What are the common symptoms of OBDII code P1786 in an Isuzu automatic transmission?

- Common symptoms include poor gear shifting, harsh shifting, delayed gear engagement, and potentially the transmission going into limp mode.

2. What could be causing the OBDII code P1786 in an Isuzu automatic transmission?

- The code P1786 typically indicates a problem with the shift time monitor circuit, which can be caused by a faulty shift solenoid, wiring issues, or a defective transmission control module.

3. How can I diagnose the cause of OBDII code P1786 in my Isuzu's automatic transmission?

- Diagnosing the issue usually involves using a professional OBDII scanner to read the code, checking the shift solenoids and wiring for any visible damage, and testing the transmission control module for proper functionality.

4. Can I continue driving my Isuzu with OBDII code P1786 present?

- It is not recommended to continue driving with this code present, as it can lead to further transmission damage and potentially unsafe driving conditions. It's best to address the issue promptly.

5. What are some repair tips for fixing OBDII code P1786 in an Isuzu automatic transmission?

- Repair tips may include replacing the faulty shift solenoid, repairing or replacing damaged wiring, or reprogramming the transmission control module if necessary.

6. Is it possible to reset the OBDII code P1786 in an Isuzu without making any repairs?

- While you can clear the code using an OBDII scanner, it's important to address the underlying issue causing the code to prevent further transmission problems.

7. How much does it typically cost to repair OBDII code P1786 in an Isuzu automatic transmission?

- The cost of repairs can vary depending on the specific cause of the code, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast with automotive knowledge fix OBDII code P1786 in an Isuzu?

- Depending on the level of expertise, some DIY enthusiasts may be able to diagnose and repair the issue themselves, especially if it involves simple tasks like replacing a shift solenoid or fixing wiring.

9. Will fixing OBDII code P1786 improve the overall performance and reliability of my Isuzu's automatic transmission?

- Yes, addressing the code promptly can help restore proper gear shifting, improve transmission performance, and prevent further damage, enhancing the reliability of your Isuzu's transmission.

10. How often does OBDII code P1786 occur in Isuzu vehicles, and is it a common issue?

- While not as common as some other OBDII codes, P1786 can still occur in Isuzu vehicles with automatic transmissions, especially in older models or those with high mileage.