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Engine-Codes – GMC – P216B 2018 GMC Sierra

P216B 2018 GMC Sierra Code - Cylinder 5 Injector High Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code P216B for a 2018 GMC Sierra specifically indicates an issue with the Cylinder 5 Injector High Control Circuit Low Voltage. Common causes include Faulty fuel injector in cylinder 5, Damaged wiring or connectors in the control circuit, Malfunctioning PCM. 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
P216B 2018 GMC Sierra indicates Cylinder 5 Injector High Control Circuit Low Voltage.
Common causes
Common causes include Faulty fuel injector in cylinder 5, Damaged wiring or connectors in the control circuit, Malfunctioning PCM.
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 10, 2024
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Code P216B 2018 GMC Sierra Description

The diagnostic trouble code P216B for a 2018 GMC Sierra specifically indicates an issue with the Cylinder 5 Injector High Control Circuit Low Voltage. This code is triggered when the powertrain control module (PCM) detects a lower than expected voltage from the control circuit for the fuel injector in cylinder 5. The fuel injector is responsible for delivering the precise amount of fuel into the cylinder for combustion. When the voltage on the control circuit is lower than expected, it can lead to improper fuel delivery, affecting the engine's performance and efficiency.

OBDII Code P216B 2018 GMC Sierra - Cylinder 5 Injector High Control Circuit Low Voltage
P216B 2018 GMC Sierra Code - Cylinder 5 Injector High Control Circuit Low Voltage

Common Causes of P216B 2018 GMC Sierra

  1. Faulty fuel injector in cylinder 5
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning PCM
  4. Issues with the fuel delivery system
  5. Electrical faults or shorts in the circuit

Symptoms of P216B 2018 GMC Sierra

  1. Engine misfires or rough idling
  2. Hesitation or stumbling during acceleration
  3. Reduced power output
  4. Stalling
  5. Poor fuel economy

How to Fix P216B 2018 GMC Sierra

  1. Diagnose the specific cause of the low voltage issue by conducting a thorough inspection of the cylinder 5 injector, wiring, connectors, and PCM.
  2. Test the fuel injector's resistance and operation to determine if it needs to be replaced.
  3. Check for any damaged or corroded wiring and connectors in the control circuit, repairing or replacing them as needed.
  4. Inspect the PCM for any faults or errors and reprogram or replace it if necessary.
  5. Clear the diagnostic trouble codes, reset the PCM, and perform a road test to ensure the issue has been resolved.

Cost to Fix P216B 2018 GMC Sierra

The cost of repairing a Cylinder 5 Injector High Control Circuit Low Voltage issue can vary depending on the specific cause of the problem and the necessary repairs. In general, the cost of replacing a fuel injector can range from $150 to $300 per injector, while addressing wiring or connector issues may cost between $100 to $200. Additionally, diagnostic time and labor rates at auto repair shops can range between $80 and $150 per hour. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on the specific circumstances of the vehicle.

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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 P216B 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P216B in a 2018 GMC Sierra?

- Common symptoms include rough idling, misfires, loss of power, and potentially increased fuel consumption.

2. What causes the OBDII code P216B "Cylinder 5 Injector High Control Circuit Low Voltage" in a 2018 GMC Sierra?

- The code is typically triggered by issues such as a faulty fuel injector, wiring problems, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P216B in my 2018 GMC Sierra?

- Diagnostic steps may involve checking the wiring harness for damage, testing the injector's resistance, and inspecting the ECM for any faults.

4. Can I continue driving my 2018 GMC Sierra with OBDII code P216B present?

- It is not recommended to drive the vehicle with this code active as it can lead to further damage and potential safety issues.

5. How do I repair the Cylinder 5 Injector High Control Circuit Low Voltage issue in a 2018 GMC Sierra?

- Repair may involve replacing the faulty fuel injector, repairing damaged wiring, or reprogramming the ECM if necessary.

6. Is it possible to reset the OBDII code P216B in a 2018 GMC Sierra without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, it will likely reappear until the root cause is properly addressed.

7. Are there any maintenance tips to prevent OBDII code P216B from occurring in a 2018 GMC Sierra?

- Regularly servicing the fuel injectors, ensuring proper wiring connections, and keeping the ECM software updated can help prevent this issue.

8. How much does it cost to repair OBDII code P216B in a 2018 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix the Cylinder 5 Injector High Control Circuit Low Voltage problem in a 2018 GMC Sierra?

- While some experienced DIYers may be able to address this issue, it is recommended to consult a professional mechanic for proper diagnosis and repair.

10. How long does it take to fix OBDII code P216B in a 2018 GMC Sierra?

- The repair time can vary based on the specific cause of the issue and the complexity of the repair, but it may take a few hours to a full day to complete the necessary repairs.

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