AutoCodes – GMC – P1666 GMC

P1666 GMC Code - Driver 3 Line 6

Quick Answer

P1666 GMC indicates Driver 3 Line 6. Common causes for P1666 GMC include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues. 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: P1666 GMC indicates Driver 3 Line 6.
Common causes: Common causes for P1666 GMC include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues.
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 5,394

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 08, 2019

Description
How To Fix
Cost to Diagnose
FAQs
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Code P1666 GMC Description

OBDII Code P1666 GMC - Driver 3 Line 6 - AutoCodes.com — P1666 GMC Code - Driver 3 Line 6

How to Fix the DTC P1666 GMC?

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 P1666 GMC 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 P1666 GMC code?

Need more information on how to fix the P1666 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1666 GMC 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 P1666 GMC Code

1. What are the common symptoms of OBDII code P1666 GMC (Driver 3 Line 6)?

- Common symptoms include rough idle, engine misfires, decreased fuel efficiency, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1666 GMC (Driver 3 Line 6)?

- Possible causes may include faulty ignition coils, damaged spark plugs, wiring issues, or a malfunctioning engine control module (ECM).

3. How can I diagnose OBDII code P1666 GMC (Driver 3 Line 6) at home?

- You can diagnose this code at home by using an OBDII scanner to read the code, inspecting the ignition system components, and checking for any visible wiring damage.

4. Can driving with OBDII code P1666 GMC (Driver 3 Line 6) cause further damage to my vehicle?

- Continued driving with this code may lead to more severe issues such as catalytic converter damage or permanent engine damage, so it's best to address the problem promptly.

5. How can I repair OBDII code P1666 GMC (Driver 3 Line 6) myself?

- DIY repair options include replacing faulty ignition components, such as coils and spark plugs, checking and repairing any damaged wiring, and resetting the ECM after repairs.

6. Is it safe to continue driving my vehicle with OBDII code P1666 GMC (Driver 3 Line 6) present?

- While the vehicle may still operate, it's not recommended to drive with this code as it can lead to poor engine performance and potential long-term damage.

7. Will resetting the OBDII system clear the P1666 GMC code?

- Resetting the system may temporarily clear the code, but if the underlying issue causing the P1666 code is not fixed, it is likely to reappear.

8. How much does it typically cost to repair OBDII code P1666 GMC (Driver 3 Line 6) at a mechanic?

- The cost of repairs can vary depending on the exact cause of the code and the labor rates of the mechanic, but it may range from $100 to $500 or more.

9. Can a faulty oxygen sensor trigger OBDII code P1666 GMC (Driver 3 Line 6)?

- While a faulty oxygen sensor is not a common cause of this specific code, it can contribute to related issues that may trigger the P1666 code.

10. How long does it usually take to repair OBDII code P1666 GMC (Driver 3 Line 6)?

- The repair time can vary based on the cause of the code and the complexity of the fix, but it generally takes a few hours to a full day for a mechanic to diagnose and repair the issue.