AutoCodes – Isuzu – P1660 Isuzu

P1660 Isuzu Code - AT To ECM Signal Failure

Quick Answer

P1660 Isuzu indicates AT To ECM Signal Failure. Common causes include Faulty Transmission Control Module (TCM), Faulty Engine Control Module (ECM), Engine Control Module (ECM) 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: P1660 Isuzu indicates AT To ECM Signal Failure.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Faulty Engine Control Module (ECM), Engine Control Module (ECM) 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 1,907

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 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1660 Isuzu Description

OBDII Code P1660 Isuzu - AT To ECM Signal Failure - AutoCodes.com — P1660 Isuzu Code - AT To ECM Signal Failure

What does this mean?

What are the Possible Causes of the DTC P1660 Isuzu?

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

How to Fix the DTC P1660 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 P1660 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 P1660 Isuzu code?

Need more information on how to fix the P1660 Isuzu code? Get Access to Factory Service Manuals

Need Help with the 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 P1660 Isuzu Code

1. What are the common symptoms of OBDII code P1660 (AT To ECM Signal Failure) in Isuzu vehicles?

- Common symptoms include erratic shifting, transmission slipping, check engine light illumination, and potential transmission overheating.

2. What are the possible causes of the OBDII code P1660 in an Isuzu vehicle?

- The code P1660 (AT To ECM Signal Failure) in Isuzu vehicles can be caused by issues with the transmission control module (TCM), faulty wiring or connectors, a malfunctioning ECM, or a failed transmission speed sensor.

3. How can I diagnose the OBDII code P1660 in my Isuzu?

- Diagnosing code P1660 involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors related to the transmission control module and ECM, and testing the transmission speed sensor for proper operation.

4. Is it safe to continue driving my Isuzu with the OBDII code P1660 present?

- It is not recommended to drive your Isuzu with the code P1660 active, as it can lead to further transmission damage and potential safety hazards. It is best to address the issue promptly.

5. How can I repair the OBDII code P1660 in my Isuzu?

- Repairing code P1660 may involve replacing a faulty transmission speed sensor, repairing damaged wiring or connectors, reprogramming the TCM or ECM, or replacing the control modules if necessary.

6. Can a DIY enthusiast fix the OBDII code P1660 issue in an Isuzu?

- While some basic diagnostics and repairs can be done by DIY enthusiasts, resolving complex issues related to code P1660 may require specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Will resetting the trouble codes make the OBDII code P1660 go away?

- Simply resetting the trouble codes may temporarily clear the check engine light, but it will not fix the underlying issue causing code P1660. The problem should be properly diagnosed and repaired to prevent it from recurring.

8. How much does it typically cost to repair the OBDII code P1660 in an Isuzu?

- The cost of repairing code P1660 can vary depending on the specific cause of the issue, labor rates in your area, and the cost of parts. It is advisable to obtain quotes from reputable repair shops for an accurate estimate.

9. Are there any preventive maintenance tips to avoid encountering the OBDII code P1660 in my Isuzu?

- To help prevent issues like code P1660, regular maintenance of your vehicle, including checking the transmission fluid levels, replacing worn-out sensors promptly, and addressing any unusual symptoms promptly, can help avoid potential problems.

10. Can extreme weather conditions affect the likelihood of triggering the OBDII code P1660 in an Isuzu?

- Extreme weather conditions, such as very high or low temperatures, can sometimes exacerbate existing issues that may trigger code P1660. Ensuring your vehicle is properly maintained and addressing any warning signs promptly can help mitigate the impact of weather-related factors.