AutoCodes – Generic – P16C9

P16C9 Code - Engine Mount Control Unit Internal Circuit Malfunction

Quick Answer

The engine mount control system controls the engine mounts electronically. Common causes include Faulty Engine Mount Control Unit, Engine Mount Control Unit harness is open or shorted, Engine Mount Control Unit 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: P16C9 indicates Engine Mount Control Unit Internal Circuit Malfunction.
Common causes: Common causes include Faulty Engine Mount Control Unit, Engine Mount Control Unit harness is open or shorted, Engine Mount Control Unit 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 5,397

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 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16C9 Description

The engine mount control system controls the engine mounts electronically. The system consists of the engine mount actuators, the engine mount control unit, and the Powertrain Control Module (PCM). The engine mount control unit uses the crankshaft and camshaft position sensor outputs (received from the PCM) to estimate engine vibration. The engine mount control unit then sends signals to the engine mount actuators to command the engine mounts to push and pull on the engine to counteract engine vibration. The engine mount control unit monitors the engine mount control unit voltage. If the ACM RLY OUT voltage is set value or less for a set time, the engine mount control unit detects a malfunction and stores a DTC.

OBDII Code P16C9 - Engine Mount Control Unit Internal Circuit Malfunction - AutoCodes.com — P16C9 Code - Engine Mount Control Unit Internal Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P16C9?

Faulty Engine Mount Control Unit
Engine Mount Control Unit harness is open or shorted
Engine Mount Control Unit circuit poor electrical connection

How to Fix the DTC P16C9?

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 P16C9 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 P16C9 code?

Need more information on how to fix the P16C9 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16C9 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P16C9 Acura — Engine Mount Control Unit Internal Circuit Malfunction
P16C9 Honda — Engine Mount Control Unit Internal Circuit Malfunction

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 P16C9 Code

1. What are the common symptoms of OBDII code P16C9 (Engine Mount Control Unit Internal Circuit Malfunction)?

The common symptoms of this code may include rough engine vibrations, excessive engine movement, and illuminated check engine light.

2. What can cause the OBDII code P16C9 to trigger?

The code P16C9 can be triggered by a faulty engine mount control unit, wiring issues, or a malfunction in the engine mount system.

3. How serious is the Engine Mount Control Unit Internal Circuit Malfunction?

This issue can affect the performance and stability of the vehicle, leading to increased vibration and potential damage to other components over time if left unresolved.

4. Can driving with the P16C9 code present cause further damage?

Continued driving with this code present can potentially cause excessive wear on engine mounts and other related components, leading to more costly repairs down the line.

5. How is the OBDII code P16C9 diagnosed?

Diagnosis typically involves using a diagnostic scanner to retrieve the code, followed by inspection of the engine mount control unit, wiring, and related components for any visible issues.

6. What are some common repair tips for resolving the Engine Mount Control Unit Internal Circuit Malfunction?

Repairing this issue may involve repairing or replacing the engine mount control unit, addressing any wiring issues, and ensuring proper installation and calibration of the new components.

7. Can I fix the P16C9 code myself, or do I need a professional mechanic?

While some DIY enthusiasts may attempt to address this issue themselves, it is recommended to seek the assistance of a qualified mechanic to properly diagnose and repair the underlying cause of the code.

8. How much does it typically cost to repair the Engine Mount Control Unit Internal Circuit Malfunction?

The cost of repairs can vary depending on the extent of the issue, the need for replacement parts, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops.

9. Will resetting the trouble codes make the P16C9 code go away?

Resetting the trouble codes may temporarily clear the check engine light, but if the underlying issue causing the P16C9 code is not addressed, it is likely to reappear after some driving cycles.

10. Is it safe to continue driving with the P16C9 code if the vehicle seems to be running fine?

Even if the vehicle appears to be running fine, it is not advisable to ignore the P16C9 code, as it can lead to potential safety hazards and further damage to the engine mount system if left unresolved.