AutoCodes – Lincoln – P166A Lincoln

P166A Lincoln Code - Restraints Deployment Communication Circuit

Quick Answer

This Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) detects an open or short in the IES circuit. Common causes include IES circuit open, IES circuit short to ground, IES circuit short to voltage. 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: P166A Lincoln indicates Restraints Deployment Communication Circuit.
Common causes: Common causes include IES circuit open, IES circuit short to ground, IES circuit short to voltage.
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 1,400

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 May 21, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P166A Lincoln Description

This Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) detects an open or short in the IES circuit.

OBDII Code P166A Lincoln - Restraints Deployment Communication Circuit - AutoCodes.com — P166A Lincoln Code - Restraints Deployment Communication Circuit

What does this mean?

What are the Possible Causes of the DTC P166A Lincoln?

IES circuit open
IES circuit short to ground
IES circuit short to voltage

How to Fix the DTC P166A Lincoln?

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 does this mean?

Code Tech Notes

Some 2013 Fusion and MKZ vehicles may exhibit an illuminated wrench light with DTC P166A stored in the powertrain control module (PCM), or the memory seat recall function may be inoperative during passive entry. Reprogram the Body Control Module (BCM) to the latest calibration

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P166A Lincoln 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.

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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 P166A Lincoln Code

1. What does OBDII code P166A mean on a Lincoln vehicle?

P166A refers to a fault in the Restraints Deployment Communication Circuit, which is part of the vehicle's airbag and safety restraint system.

2. What are the common symptoms of code P166A on a Lincoln?

Symptoms may include an illuminated airbag warning light, failure of the airbag system to deploy in a crash, or the inability to communicate with the airbag control module during diagnostics.

3. What causes the P166A code to appear?

Common causes include damaged wiring or connectors in the restraints communication circuit, a faulty airbag control module, or interference from other electrical components.

4. Can I drive my Lincoln with the P166A code active?

While the vehicle may still drive, the airbag system may not function properly in the event of a collision, creating a significant safety risk.

5. How do I diagnose the P166A code on my Lincoln?

Start with a visual inspection of the wiring and connectors in the airbag system. Use a scan tool to check for additional codes and verify communication with the airbag control module.

6. What tools are needed to repair the P166A code?

Basic tools may include a multimeter for testing circuits, a diagnostic scan tool for reading codes, and possibly specialized tools for accessing the airbag system components.

7. How much does it cost to fix the P166A code on a Lincoln?

Repair costs can vary but may range from $100 for simple wiring repairs to several hundred dollars if the airbag control module needs replacement.

8. Can a blown fuse cause the P166A code?

Yes, a blown fuse in the airbag or restraint system circuit could cause the P166A code to appear and should be checked during diagnosis.

9. Is it safe to attempt DIY repairs for the P166A code?

DIY repairs are possible if you have experience with automotive electrical systems, but caution is necessary as improper handling of airbag components can be dangerous.

10. Does clearing the code reset the airbag system?

Clearing the code with a scan tool may temporarily turn off the airbag warning light, but the underlying issue must be fixed to ensure the system functions properly.