AutoCodes – Honda – P1786 Honda

P1786 Honda Code - Automatic Transmission Poor Gear Shift

Quick Answer

P1786 Honda 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 Honda 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 4,225

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 Honda Description

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

What does this mean?

What are the Possible Causes of the DTC P1786 Honda?

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 Honda?

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 Honda 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 Honda code?

Need more information on how to fix the P1786 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1786 Honda code diagnosed by a professional: Find a repair shop in your area

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 Honda Code

1. What are the common symptoms of OBDII code P1786 in a Honda automatic transmission?

- Common symptoms include poor gear shifting, delayed engagement when shifting gears, and potential slippage while driving.

2. What are the possible causes of OBDII code P1786 in a Honda automatic transmission?

- The code can be triggered by issues such as low transmission fluid levels, a malfunctioning shift solenoid, faulty transmission control module, or internal transmission problems.

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

- A thorough diagnostic scan using a professional OBDII scanner can help pinpoint the specific issue causing the code. Additionally, checking the transmission fluid level and condition is important.

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

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

5. How can I repair OBDII code P1786 in my Honda automatic transmission?

- Repairs may involve addressing the root cause of the code, such as replacing a faulty shift solenoid, repairing transmission wiring, ensuring proper fluid levels, or seeking assistance from a professional mechanic.

6. Is it possible to reset OBDII code P1786 in a Honda without repairing the underlying issue?

- While it is possible to clear the code with an OBDII scanner, it is crucial to address the underlying problem to prevent the code from reoccurring and causing further transmission issues.

7. Are there any DIY tips for troubleshooting OBDII code P1786 in a Honda automatic transmission?

- DIY tips include checking transmission fluid levels and condition, inspecting for any visible damage to transmission components, and ensuring proper electrical connections.

8. How much does it typically cost to repair OBDII code P1786 in a Honda automatic transmission?

- Repair costs can vary depending on the specific issue causing the code, but they may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can OBDII code P1786 be a recurring issue in Honda automatic transmissions?

- Yes, if the underlying problem is not properly addressed, the code can reoccur, leading to ongoing transmission issues and potential damage.

10. Is it advisable to seek professional help for diagnosing and repairing OBDII code P1786 in a Honda automatic transmission?

- Yes, it is recommended to consult a professional mechanic or a certified Honda technician for accurate diagnosis and proper repair of the transmission issue indicated by OBDII code P1786.