AutoCodes – Cadillac – P1666 Cadillac

P1666 Cadillac Code - Driver 3 Line 6

Quick Answer

P1666 Cadillac indicates Driver 3 Line 6. Common causes for P1666 Cadillac 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 Cadillac indicates Driver 3 Line 6.
Common causes: Common causes for P1666 Cadillac 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 2,954

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 Cadillac Description

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

How to Fix the DTC P1666 Cadillac?

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 Cadillac 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 Cadillac code?

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

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Get the P1666 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code P1666 in a Cadillac, specifically Driver 3 Line 6?

- Common symptoms include issues with the driver 3 line 6 circuit, such as poor engine performance, rough idling, and potential stalling.

2. What can cause the OBDII code P1666 to trigger in a Cadillac?

- The code P1666 in a Cadillac is typically triggered by a problem in the Driver 3 Line 6 circuit, which can be caused by wiring issues, a faulty driver module, or a defective component.

3. How do I diagnose the OBDII code P1666 in my Cadillac?

- Diagnosing the code P1666 involves inspecting the wiring harness for any damage, testing the driver module for functionality, and checking the related components for proper operation.

4. Can I still drive my Cadillac with the OBDII code P1666 present?

- It is not recommended to drive your Cadillac with the code P1666 present, as it can lead to potential engine performance issues and further damage if left unresolved.

5. What are some repair tips for fixing the OBDII code P1666 in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring, replacing the driver module if necessary, and ensuring all related components are functioning correctly.

6. Is it safe to clear the OBDII code P1666 in my Cadillac using a diagnostic tool?

- Clearing the code using a diagnostic tool may temporarily turn off the check engine light, but it is essential to address the underlying issue causing the code to prevent further problems.

7. How much does it typically cost to repair the OBDII code P1666 in a Cadillac?

- The cost of repairing the code P1666 can vary depending on the exact cause of the issue, but it may involve labor costs for diagnosis and repair, as well as potential parts replacement.

8. Can a DIY enthusiast fix the OBDII code P1666 issue in a Cadillac?

- While some DIY enthusiasts may be able to diagnose and repair the code P1666 themselves, it is recommended to have the issue addressed by a professional mechanic to ensure proper repair and prevent further damage.

9. Are there any recalls or technical service bulletins related to the OBDII code P1666 in Cadillac vehicles?

- It is advisable to check with the manufacturer or a dealership for any recalls or technical service bulletins related to the OBDII code P1666 in Cadillac vehicles to see if there are any known issues or remedies.

10. How urgent is it to address the OBDII code P1666 in a Cadillac?

- It is important to address the code P1666 promptly to prevent potential engine performance issues and further damage to the vehicle. Delaying repairs can lead to more significant problems down the road.