AutoCodes – Buick – P166C Buick

P166C Buick Code - Intake Air Heater Resistance

Quick Answer

The Engine Control Module (ECM) monitors the Intake Air (IA) Heater. Common causes include Faulty Intake Air (IA) Heater, Intake Air (IA) Heater harness is open or shorted, Intake Air (IA) Heater 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: P166C Buick indicates Intake Air Heater Resistance.
Common causes: Common causes include Faulty Intake Air (IA) Heater, Intake Air (IA) Heater harness is open or shorted, Intake Air (IA) Heater 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 884

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 Jan 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P166C Buick Description

The Engine Control Module (ECM) monitors the Intake Air (IA) Heater. The ECM sets the OBDII code when the Intake Air (IA) Heater is not to factory specifications.

OBDII Code P166C Buick - Intake Air Heater Resistance - AutoCodes.com — P166C Buick Code - Intake Air Heater Resistance

What does this mean?

What are the Possible Causes of the DTC P166C Buick?

Faulty Intake Air (IA) Heater
Intake Air (IA) Heater harness is open or shorted
Intake Air (IA) Heater circuit poor electrical connection

How to Fix the DTC P166C Buick?

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 P166C Buick 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 P166C Buick code?

Need more information on how to fix the P166C Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P166C Buick 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 P166C Buick Code

1. What are the common symptoms of OBDII code P166C (Buick) related to Intake Air Heater Resistance?

- Common symptoms include decreased engine performance, rough idling, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P166C (Buick) indicating Intake Air Heater Resistance?

- The potential causes can include a faulty intake air heater, damaged wiring or connectors, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose OBDII code P166C (Buick) associated with Intake Air Heater Resistance?

- Diagnosis typically involves using a scan tool to retrieve the trouble code, inspecting the intake air heater system, and testing the components for proper resistance.

4. Can a DIY enthusiast repair OBDII code P166C (Buick) for Intake Air Heater Resistance?

- While some basic inspections and tests can be performed, it is recommended to consult a professional mechanic for accurate diagnosis and repair of this code.

5. What are the repair options for OBDII code P166C (Buick) linked to Intake Air Heater Resistance?

- Repair options may include replacing the faulty intake air heater, repairing damaged wiring or connectors, or reprogramming the PCM if necessary.

6. Is it safe to continue driving with OBDII code P166C (Buick) triggered by Intake Air Heater Resistance?

- It is generally not recommended to drive with this code present, as it can lead to reduced engine performance and potential long-term damage if left unresolved.

7. How much does it typically cost to repair OBDII code P166C (Buick) associated with Intake Air Heater Resistance?

- The repair costs can vary depending on the specific issue, but it is advisable to budget for diagnostic fees, parts replacement, and labor charges.

8. Can a faulty intake air heater cause other engine problems besides triggering OBDII code P166C (Buick)?

- Yes, a malfunctioning intake air heater can affect fuel efficiency, emissions, and overall engine performance if not addressed promptly.

9. Are there any preventive maintenance steps to avoid OBDII code P166C (Buick) related to Intake Air Heater Resistance?

- Regular inspection of the intake air heater system and timely replacement of worn components can help prevent the occurrence of this trouble code.

10. How long does it typically take to repair OBDII code P166C (Buick) due to Intake Air Heater Resistance?

- The repair time can vary based on the exact cause of the issue, but it may range from a few hours to a day, depending on the complexity of the repair process.