AutoCodes – Generic – P1666

P1666 Code - Cruise Control Module Internal

Quick Answer

This diagnosis runs continuously when the engine is running. Common causes include Faulty Cruise Control Module, Cruise Control Module harness is open or shorted, Cruise Control Moduler circuit poor electrical connection. 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 indicates Cruise Control Module Internal.
Common causes: Common causes include Faulty Cruise Control Module, Cruise Control Module harness is open or shorted, Cruise Control Moduler circuit poor electrical connection.
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 11,843

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 Mar 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1666 Description

This diagnosis runs continuously when the engine is running. The Module regularly performs internal controller diagnostic tests, and Diagnostic Trouble Code (DTC) will be set when an internal hardware failure has been detected.

OBDII Code P1666 - Cruise Control Module Internal - AutoCodes.com — P1666 Code - Cruise Control Module Internal

What does this mean?

What are the Possible Causes of the DTC P1666?

Faulty Cruise Control Module
Cruise Control Module harness is open or shorted
Cruise Control Moduler circuit poor electrical connection

How to Fix the DTC P1666?

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 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 code?

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

Need Help with the Code?

Get the P1666 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1666 Audi — Fuel Injector 1 Mechanical Fault
P1666 Buick — Driver 3 Line 6
P1666 Cadillac — Driver 3 Line 6
P1666 Chevrolet — Driver 3 Line 6
P1666 Chrysler — Cruise Control Module Internal
P1666 Dodge — Cruise Control Module Internal
P1666 GMC — Driver 3 Line 6
P1666 Jeep — Cruise Control Module Internal
P1666 Land Rover — Engine Anti-Theft Signal Circuit Malfunction
P1666 RAM — Cruise Control Module Internal
P1666 Volkswagen — Fuel Injector 1 Mechanical Fault

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 Code

1. What are common symptoms of OBDII code P1666 (Cruise Control Module Internal)?

- Common symptoms include a non-functioning cruise control system, illuminated Check Engine Light, and potential loss of vehicle speed control.

2. What are the possible causes of OBDII code P1666 (Cruise Control Module Internal)?

- The code may be triggered by a faulty cruise control module, damaged wiring or connectors, or a malfunctioning cruise control switch.

3. How can I diagnose OBDII code P1666 (Cruise Control Module Internal)?

- Diagnosing the code may involve using a diagnostic scanner to retrieve the fault codes, checking the cruise control module for damage, and inspecting related wiring for any issues.

4. Can I still drive my vehicle with OBDII code P1666 (Cruise Control Module Internal)?

- It is generally safe to drive the vehicle with this code, but it is recommended to have the issue diagnosed and repaired as soon as possible to restore the cruise control functionality.

5. Are there any simple repairs I can try for OBDII code P1666 (Cruise Control Module Internal)?

- Simple repairs may include checking and cleaning the cruise control connectors, ensuring proper grounding, and resetting the vehicle's computer to see if the code reappears.

6. How much does it typically cost to repair OBDII code P1666 (Cruise Control Module Internal)?

- Repair costs can vary depending on the underlying cause of the code, but they may range from $100 to $300 for parts and labor.

7. Can a DIY enthusiast fix OBDII code P1666 (Cruise Control Module Internal)?

- DIY enthusiasts with automotive repair experience may be able to address this code by following diagnostic procedures, checking components, and making necessary repairs or replacements.

8. Will OBDII code P1666 (Cruise Control Module Internal) affect my vehicle's performance?

- This code typically only affects the cruise control system and should not have a significant impact on the overall performance of the vehicle.

9. How long does it usually take to repair OBDII code P1666 (Cruise Control Module Internal)?

- The repair time for this code can vary depending on the exact cause and complexity of the issue, but it may take anywhere from 1 to 3 hours at a repair shop.

10. Can OBDII code P1666 (Cruise Control Module Internal) cause other problems if left unresolved?

- If left unresolved, this code may lead to continued non-functioning cruise control, potential safety concerns related to speed control, and possible further damage to related components.