AutoCodes – Generic – P16C5

P16C5 Code - Engine Mount Actuator Control Power Circuit Stuck On

Quick Answer

The engine mount control system controls the engine mounts electronically. Common causes include Faulty Engine Mount Actuator, Engine Mount Actuator harness is open or shorted, Engine Mount Actuator 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: P16C5 indicates Engine Mount Actuator Control Power Circuit Stuck On.
Common causes: Common causes include Faulty Engine Mount Actuator, Engine Mount Actuator harness is open or shorted, Engine Mount Actuator 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 2,967

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 P16C5 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 P16C5 - Engine Mount Actuator Control Power Circuit Stuck On - AutoCodes.com — P16C5 Code - Engine Mount Actuator Control Power Circuit Stuck On

What does this mean?

What are the Possible Causes of the DTC P16C5?

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

How to Fix the DTC P16C5?

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 P16C5 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 P16C5 code?

Need more information on how to fix the P16C5 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16C5 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P16C5 Acura — Engine Mount Actuator Control Power Circuit Stuck On
P16C5 BMW — Main Relay Switching Delay
P16C5 Honda — Engine Mount Actuator Control Power Circuit Stuck On
P16C5 MINI — Main Relay Switching Delay

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 P16C5 Code

1. What does the OBDII code P16C5 mean?

P16C5 indicates a problem in the Engine Mount Actuator Control Power Circuit, where the circuit is stuck in the "on" position.

2. What are the symptoms of code P16C5?

Common symptoms include increased engine vibrations, unusual noises from the engine bay, or a check engine light.

3. What causes the P16C5 code to appear?

Possible causes include a faulty engine mount actuator, damaged wiring or connections, or a malfunctioning control module.

4. Can I still drive with a P16C5 code?

While the vehicle may be drivable, ignoring this code could lead to additional stress on the engine and other components due to excessive vibrations.

5. How is the P16C5 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the wiring and connections, and test the engine mount actuator for proper operation.

6. How do I fix the P16C5 code?

Repairs may involve replacing the faulty engine mount actuator, repairing damaged wiring, or reprogramming or replacing the control module.

7. Is the P16C5 code an urgent issue?

While it may not cause immediate engine failure, addressing this issue promptly is important to maintain vehicle comfort and prevent further damage.

8. How much does it cost to fix the P16C5 code?

Repair costs vary but typically range from $200 to $600, depending on whether the actuator or wiring requires replacement.

9. Can a bad battery cause the P16C5 code?

A weak or failing battery can potentially contribute to electrical issues, but itâ€™s not a common cause for this specific code.

10. Will clearing the P16C5 code solve the problem?

Clearing the code will turn off the check engine light temporarily, but the underlying issue must be fixed to prevent the code from returning.

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