AutoCodes – Generic – P1661

P1661 Code - MIL Control Circuit Conditions

Quick Answer

With the engine speed over 600 rpm, the Powertrain Control Module (PCM) detects that the Actual and Commanded state of the MIL Control circuit did not match, condition met for over 5 seconds. Common causes include Faulty Malfunction Indicator Lamp (MIL), Malfunction Indicator Lamp (MIL) harness is open or shorted, Malfunction Indicator Lamp (MIL) 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: P1661 indicates MIL Control Circuit Conditions.
Common causes: Common causes include Faulty Malfunction Indicator Lamp (MIL), Malfunction Indicator Lamp (MIL) harness is open or shorted, Malfunction Indicator Lamp (MIL) 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 41,557

How popular is this code, among other codes? Medium

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 Sep 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1661 Description

With the engine speed over 600 rpm, the Powertrain Control Module (PCM) detects that the Actual and Commanded state of the MIL Control circuit did not match, condition met for over 5 seconds.

OBDII Code P1661 - MIL Control Circuit Conditions - AutoCodes.com — P1661 Code - MIL Control Circuit Conditions

What does this mean?

What are the Possible Causes of the DTC P1661?

Faulty Malfunction Indicator Lamp (MIL)
Malfunction Indicator Lamp (MIL) harness is open or shorted
Malfunction Indicator Lamp (MIL) circuit poor electrical connection

How to Fix the DTC P1661?

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 P1661 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 P1661 code?

Need more information on how to fix the P1661 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1661 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1661 Audi — Engine Coolant Blower Motor Speed 2 Short To Positive
P1661 Buick — MIL Control Circuit Conditions
P1661 Cadillac — MIL Control Circuit Conditions
P1661 Chevrolet — MIL Control Circuit Conditions
P1661 Ford — Output Circuit Check Signal Low
P1661 GMC — MIL Control Circuit Conditions
P1661 Toyota — Turbocharger 2 Exhaust Gas Control Valve Circuit Malfunction
P1661 Volkswagen — Engine Coolant Blower Motor Speed 2 Short To Positive

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 P1661 Code

1. What are the common symptoms of OBDII code P1661 (MIL Control Circuit Conditions)?

- The common symptoms include the Check Engine Light (MIL) being illuminated on the dashboard and potential issues with the vehicle's emissions system.

2. What are the possible causes of OBDII code P1661?

- The code P1661 can be caused by a faulty MIL control circuit, damaged wiring related to the MIL circuit, or a malfunctioning Engine Control Module (ECM).

3. How serious is OBDII code P1661?

- While OBDII code P1661 may not cause immediate drivability issues, it should not be ignored as it can affect the vehicle's emissions system and overall performance.

4. Can I continue to drive my vehicle with OBDII code P1661?

- It is generally not recommended to drive the vehicle with an illuminated Check Engine Light due to code P1661, as it may lead to further issues with the emissions system.

5. How can I diagnose and repair OBDII code P1661?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the MIL control circuit for faults, inspecting wiring for damage, and testing the ECM. Repair may involve repairing or replacing damaged wiring, or replacing the ECM if necessary.

6. Can I reset the Check Engine Light caused by OBDII code P1661 on my own?

- While you can reset the Check Engine Light using an OBDII scanner, it is important to diagnose and address the root cause of the code to prevent it from recurring.

7. Are there any DIY tips for troubleshooting OBDII code P1661?

- DIY tips for troubleshooting code P1661 include visually inspecting the wiring connected to the MIL circuit, checking fuses related to the ECM, and ensuring proper ECM connections.

8. How much does it typically cost to repair OBDII code P1661?

- The cost of repairing OBDII code P1661 can vary depending on the underlying cause, but it may range from $100 to $500, including parts and labor.

9. Will OBDII code P1661 cause my vehicle to fail an emissions test?

- Yes, OBDII code P1661 can cause your vehicle to fail an emissions test, as it indicates issues with the MIL control circuit that are related to emissions control.

10. Can a mechanic help me fix OBDII code P1661, or is it a DIY repair?

- A mechanic can help diagnose and repair OBDII code P1661, especially if you are not familiar with automotive electrical systems or engine control modules.