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Engine-Codes – Generic – P16D8

P16D8 Code - PCM Internal IMA-CAN Communication Circuit Malfunction

Quick Answer

The P16D8 diagnostic trouble code refers to a malfunction in the PCM (Powertrain Control Module) internal IMA-CAN (Integrated Motor Assist Controller Area Network) communication circuit. Common causes include Faulty Wiring: One of the common causes of this code is damaged or faulty wiring in the communication circuit between the PCM and the integrated motor assist system, Defective Sensors: Malfunctioning sensors within the integrated motor assist system can also trigger this code, Software Issues: Problems with the software or programming within the PCM or integrated motor assist system can cause communication errors. 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
P16D8 indicates PCM Internal IMA-CAN Communication Circuit Malfunction.
Common causes
Common causes include Faulty Wiring: One of the common causes of this code is damaged or faulty wiring in the communication circuit between the PCM and the integrated motor assist system, Defective Sensors: Malfunctioning sensors within the integrated motor assist system can also trigger this code, Software Issues: Problems with the software or programming within the PCM or integrated motor assist system can cause communication errors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P16D8 Description

The P16D8 diagnostic trouble code refers to a malfunction in the PCM (Powertrain Control Module) internal IMA-CAN (Integrated Motor Assist Controller Area Network) communication circuit. This means that there is a communication issue between the PCM and the integrated motor assist system in the vehicle. The integrated motor assist system is typically found in hybrid vehicles and is responsible for assisting the internal combustion engine for improved fuel efficiency and performance. When this communication circuit malfunctions, it can lead to various issues with the vehicle's performance and drivability.

OBDII Code P16D8 - PCM Internal IMA-CAN Communication Circuit Malfunction
P16D8 Code - PCM Internal IMA-CAN Communication Circuit Malfunction

Common Causes of P16D8

  1. Faulty Wiring: One of the common causes of this code is damaged or faulty wiring in the communication circuit between the PCM and the integrated motor assist system.
  2. Defective Sensors: Malfunctioning sensors within the integrated motor assist system can also trigger this code.
  3. Software Issues: Problems with the software or programming within the PCM or integrated motor assist system can cause communication errors.
  4. PCM Failure: A failing or malfunctioning PCM can result in communication issues with the integrated motor assist system.

Symptoms of P16D8

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Power: The vehicle may experience a loss of power or reduced acceleration due to the communication issue between the PCM and the integrated motor assist system.
  3. Poor Fuel Efficiency: A malfunction in the communication circuit can also lead to decreased fuel efficiency as the integrated motor assist system may not be operating optimally.
  4. Stalling: In severe cases, the vehicle may stall or have difficulty starting due to the communication problem between the PCM and the integrated motor assist system.

How to Fix P16D8

  1. Diagnostic Scan: The first step in resolving this issue is to perform a diagnostic scan using an OBD-II scanner to pinpoint the exact cause of the communication malfunction.
  2. Check Wiring: Inspect the wiring harness between the PCM and the integrated motor assist system for any damage or loose connections. Repair or replace any faulty wiring.
  3. Sensor Replacement: If faulty sensors are identified as the cause, they will need to be replaced to restore proper communication between the PCM and the integrated motor assist system.
  4. Software Update: Updating the software or reprogramming the PCM and integrated motor assist system may be necessary to resolve the communication issue.
  5. PCM Replacement: In severe cases where the PCM is determined to be faulty, it may need to be replaced to fix the internal communication problem.

Cost to Fix P16D8

The cost of repairing a PCM Internal IMA-CAN Communication Circuit Malfunction can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the repair costs for this type of issue can range from $200 to $800, including parts and labor. It is important to note that labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple shops to get a more accurate estimate. Additionally, the cost of any necessary replacement parts will also impact the total repair cost.

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Code P16D8 Information for Specific Makes

  • P16D8 Acura — PCM Internal IMA-CAN Communication Circuit Malfunction
  • P16D8 Buick — Sensor Supply Voltage Relay Control Circuit Low Voltage
  • P16D8 Cadillac — Sensor Supply Voltage Relay Control Circuit Low Voltage
  • P16D8 Chevrolet — Sensor Supply Voltage Relay Control Circuit Low Voltage
  • P16D8 GMC — Sensor Supply Voltage Relay Control Circuit Low Voltage
  • P16D8 Honda — PCM Internal IMA-CAN Communication 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 P16D8 Code

1. What are common symptoms of OBDII code P16D8 (PCM Internal IMA-CAN Communication Circuit Malfunction)?

- Common symptoms include check engine light illumination, poor engine performance, and potential issues with the hybrid system in hybrid vehicles.

2. What are some possible causes of OBDII code P16D8?

- Possible causes include a faulty PCM (Powertrain Control Module), issues with the IMA-CAN communication circuit, wiring problems, or a malfunctioning hybrid system in hybrid vehicles.

3. How can I diagnose OBDII code P16D8?

- Diagnosing this code usually involves using a scan tool to read the code, checking the wiring and connections related to the IMA-CAN communication circuit, and testing the PCM for proper functionality.

4. Can OBDII code P16D8 be triggered in both gasoline and hybrid vehicles?

- Yes, this code can be triggered in both gasoline and hybrid vehicles, but it is more commonly associated with issues in hybrid vehicles due to the nature of the IMA-CAN communication circuit.

5. What are some repair tips for addressing OBDII code P16D8?

- Repair tips may include inspecting and repairing any damaged wiring or connectors in the IMA-CAN communication circuit, ensuring the PCM is functioning correctly, and addressing any issues with the hybrid system in hybrid vehicles.

6. Is it safe to continue driving with OBDII code P16D8 present?

- It is recommended to address the underlying issue causing the code as soon as possible to prevent potential damage to the vehicle and ensure optimal performance.

7. Can I reset OBDII code P16D8 on my own?

- While you can clear the code using a scan tool, it is important to diagnose and repair the root cause of the issue to prevent the code from reoccurring.

8. How much does it typically cost to repair OBDII code P16D8?

- Repair costs can vary depending on the underlying issue causing the code, but they may range from a simple wiring repair to a more complex PCM replacement in hybrid vehicles.

9. Will OBDII code P16D8 cause my vehicle to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test, as it indicates a malfunction in the PCM internal communication circuit, which can impact emissions control systems.

10. How long does it usually take to repair OBDII code P16D8?

- The repair time can vary depending on the complexity of the issue, but it may range from a quick wiring repair to a more involved diagnostic process and component replacement, which could take several hours to complete.

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