AutoCodes – Acura – P16C9 Acura

P16C9 Acura 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 Acura 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 1,222

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

What does this mean?

What are the Possible Causes of the DTC P16C9 Acura?

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 Acura?

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 Acura 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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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 Acura Code

1. What does the OBDII code P16C9 mean on an Acura?

P16C9 indicates an "Engine Mount Control Unit Internal Circuit Malfunction," meaning there is an issue with the internal circuitry of the engine mount control unit.

2. What are the common symptoms of the P16C9 code?

Symptoms may include increased engine vibrations, a check engine light, or unusual noises from the engine area, particularly when accelerating or idling.

3. What causes the P16C9 code to appear?

Common causes include a faulty engine mount control unit, damaged wiring or connectors, or internal electronic failure within the control unit.

4. Is it safe to drive with the P16C9 code?

It may be safe for short distances, but driving with excessive engine vibrations can cause further damage to other components. Prompt diagnosis and repair are recommended.

5. How is the P16C9 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the engine mount control unit, check for wiring issues, and test the electrical circuits for continuity and proper voltage.

6. Can a loose or broken engine mount trigger the P16C9 code?

No, this code specifically points to an electrical or internal malfunction in the control unit, not a physical failure of the engine mount itself.

7. How do you fix the P16C9 code on an Acura?

Repairs may involve replacing the engine mount control unit, repairing damaged wiring or connectors, or updating the vehicleâ€™s software if applicable.

8. How much does it cost to fix the P16C9 code?

Costs vary depending on the issue, but replacing the engine mount control unit typically ranges from $300 to $700, including parts and labor.

9. Can a software update resolve the P16C9 code?

In some cases, a software update for the engine control module (ECM) or engine mount control unit may resolve the issue if the malfunction is caused by a programming error.

10. Can you clear the P16C9 code without repairing the issue?

Clearing the code without addressing the underlying problem will likely result in the code returning. Proper diagnosis and repair are necessary to fix the issue permanently.