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Engine-Codes – GMC – P216C 2018 GMC Sierra

P216C 2018 GMC Sierra Code - Cylinder 5 Injector High Control Circuit High Voltage

Quick Answer

The diagnostic trouble code P216C for a 2018 GMC Sierra indicates an issue with the Cylinder 5 Injector High Control Circuit High Voltage. Common causes include Faulty fuel injector in cylinder 5, Wiring issues in the control circuit, Malfunctioning Engine Control Module (ECM). 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
P216C 2018 GMC Sierra indicates Cylinder 5 Injector High Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel injector in cylinder 5, Wiring issues in the control circuit, Malfunctioning Engine Control Module (ECM).
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 14, 2024
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Code P216C 2018 GMC Sierra Description

The diagnostic trouble code P216C for a 2018 GMC Sierra indicates an issue with the Cylinder 5 Injector High Control Circuit High Voltage. This means that there is a problem with the fuel injector in cylinder 5 of the engine, specifically related to the control circuit having a higher voltage than normal. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time for efficient engine operation. When the control circuit voltage is too high, it can lead to a variety of performance issues and potential long-term damage if not addressed promptly.

OBDII Code P216C 2018 GMC Sierra - Cylinder 5 Injector High Control Circuit High Voltage
P216C 2018 GMC Sierra Code - Cylinder 5 Injector High Control Circuit High Voltage

Common Causes of P216C 2018 GMC Sierra

  1. Faulty fuel injector in cylinder 5
  2. Wiring issues in the control circuit
  3. Malfunctioning Engine Control Module (ECM)
  4. Poor connection in the injector harness
  5. Electrical issues such as a short circuit or high resistance in the circuit

Symptoms of P216C 2018 GMC Sierra

  1. Reduced fuel efficiency
  2. Loss of power and acceleration
  3. Rough idling or engine misfires
  4. Engine stalling
  5. Check Engine Light illuminated on the dashboard

How to Fix P216C 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the fuel injector in cylinder 5, checking for any signs of damage or clogging.
  2. Test the control circuit wiring for continuity and ensure there are no shorts or breaks in the connections.
  3. Check the Engine Control Module (ECM) for any fault codes related to the injector circuit and perform any necessary reprogramming or replacement.
  4. Inspect the injector harness for any loose or corroded connections, repairing or replacing as needed.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P216C 2018 GMC Sierra

The typical repair costs for addressing a Cylinder 5 Injector High Control Circuit High Voltage issue can vary depending on the specific cause of the problem. In general, you can expect to pay anywhere from $200 to $600 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to obtain quotes from multiple shops to find the best price for your specific vehicle and location.

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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 P216C 2018 GMC Sierra Code

1. What does the OBDII code P216C mean on a 2018 GMC Sierra?

P216C indicates a fault in the Cylinder 5 Injector High Control Circuit, specifically a high voltage condition.

2. What are the symptoms of code P216C on a 2018 GMC Sierra?

Common symptoms include rough idling, misfiring, reduced engine performance, poor fuel efficiency, and the check engine light turning on.

3. What causes code P216C on a 2018 GMC Sierra?

This code is typically caused by issues such as a shorted or open injector circuit, a faulty fuel injector, damaged wiring, or a defective Engine Control Module (ECM).

4. Can I drive my 2018 GMC Sierra with code P216C?

Driving with this code is not recommended, as it can lead to engine misfires, reduced power, and potential damage to other components if not addressed promptly.

5. How do I diagnose code P216C on a 2018 GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for damage, testing the fuel injector for proper operation, and using a multimeter to check for voltage irregularities in the control circuit.

6. How is code P216C fixed on a 2018 GMC Sierra?

Repairs may include replacing the faulty fuel injector, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to fix code P216C on a 2018 GMC Sierra?

Repair costs vary depending on the root cause, but replacing a fuel injector typically costs $200–$500, with additional labor charges if wiring or ECM repairs are needed.

8. Can a bad ECM cause code P216C on a 2018 GMC Sierra?

Yes, a malfunctioning ECM can send incorrect signals to the fuel injector, causing the high voltage condition indicated by P216C.

9. How do I prevent code P216C from recurring on my 2018 GMC Sierra?

Regular maintenance, including inspecting and cleaning injector wiring, ensuring proper fuel quality, and addressing engine issues promptly, can help prevent this code from recurring.

10. Does code P216C affect other cylinders on a 2018 GMC Sierra?

No, this code specifically pertains to Cylinder 5, but unresolved issues could lead to stress on other components and potentially cause additional cylinder-related problems over time.

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