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P16FF 2014 GMC Sierra Code - Engine Controls Ignition Relay Request Signal Message Counter Incorrect

Quick Answer

The P16FF diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is an issue with the Engine Controls Ignition Relay Request Signal Message Counter being incorrect. Common causes include Faulty ignition relay, Wiring or connection issues in the ignition relay circuit, ECM/PCM software malfunction. 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
P16FF 2014 GMC Sierra indicates Engine Controls Ignition Relay Request Signal Message Counter Incorrect.
Common causes
Common causes include Faulty ignition relay, Wiring or connection issues in the ignition relay circuit, ECM/PCM software malfunction.
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 16, 2024
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Code P16FF 2014 GMC Sierra Description

The P16FF diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is an issue with the Engine Controls Ignition Relay Request Signal Message Counter being incorrect. This code typically points to a communication problem within the vehicle's engine control module (ECM) or powertrain control module (PCM). The ECM/PCM uses the ignition relay request signal to control the ignition system, which is crucial for starting and running the engine smoothly. When the message counter is incorrect, it means that the ECM/PCM is not receiving the expected number of signals related to the ignition relay request. This can lead to a variety of performance issues and potentially cause the engine to stall or not start at all.

OBDII Code P16FF 2014 GMC Sierra - Engine Controls Ignition Relay Request Signal Message Counter Incorrect
P16FF 2014 GMC Sierra Code - Engine Controls Ignition Relay Request Signal Message Counter Incorrect

Common Causes of P16FF 2014 GMC Sierra

  1. Faulty ignition relay
  2. Wiring or connection issues in the ignition relay circuit
  3. ECM/PCM software malfunction
  4. Electrical interference or signal disruption
  5. Faulty ECM/PCM

Symptoms of P16FF 2014 GMC Sierra

  1. Engine misfires or hesitation during acceleration
  2. Difficulty starting the engine
  3. Reduced fuel efficiency
  4. Illumination of the check engine light
  5. Engine stalling or rough idling

How to Fix P16FF 2014 GMC Sierra

  1. Begin by using a diagnostic scanner to retrieve and record any additional DTCs present in the vehicle's system.
  2. Inspect the ignition relay and related wiring for any visible damage or loose connections. Replace the relay if necessary.
  3. Perform a thorough inspection of the ECM/PCM and associated components to check for any signs of damage or malfunction. Consider reprogramming or replacing the ECM/PCM if needed.
  4. Clear the DTC and reset the ECM/PCM to see if the issue persists. Test drive the vehicle to ensure the problem has been resolved.
  5. If the problem persists, consult a professional mechanic or dealership for further diagnosis and repair.

Cost to Fix P16FF 2014 GMC Sierra

The typical repair costs for addressing a P16FF code in a 2014 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the parts/labour required for repair. It's important to note that the actual cost may vary based on the location, dealership rates, and the extent of the repair needed. Diagnostic time and labour rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources for a more accurate estimate.

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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 P16FF 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P16FF on a 2014 GMC Sierra?

The common symptoms of code P16FF may include engine misfires, rough idling, reduced engine performance, and in some cases, the vehicle may fail to start.

2. What does the OBDII code P16FF indicate on a 2014 GMC Sierra?

Code P16FF indicates that the Engine Controls Ignition Relay Request Signal Message Counter is reporting incorrect data, suggesting a potential issue with the ignition relay system.

3. What are the possible causes of OBDII code P16FF on a 2014 GMC Sierra?

Possible causes of code P16FF include a faulty ignition relay, damaged wiring or connectors in the ignition relay circuit, a malfunctioning Engine Control Module (ECM), or software issues.

4. How can I diagnose the OBDII code P16FF on my 2014 GMC Sierra?

Diagnosing code P16FF may involve checking the ignition relay for proper operation, inspecting the wiring and connectors for damage, and using a diagnostic scanner to retrieve specific information related to the code.

5. Can I still drive my 2014 GMC Sierra with OBDII code P16FF active?

It is not recommended to drive your vehicle with an active OBDII code P16FF, as it can lead to further damage to the engine or ignition system. It's best to address the issue promptly.

6. How can I repair OBDII code P16FF on my 2014 GMC Sierra?

Repairing code P16FF may involve replacing the faulty ignition relay, repairing damaged wiring or connectors, resetting the ECM, or updating the software to correct the message counter discrepancy.

7. Will resetting the OBDII code P16FF on my 2014 GMC Sierra make it go away permanently?

Resetting the code may temporarily clear it, but if the underlying issue causing code P16FF is not addressed, the code is likely to return. It's important to diagnose and repair the root cause.

8. Is it safe to ignore OBDII code P16FF on my 2014 GMC Sierra?

Ignoring OBDII code P16FF can lead to potential engine performance issues, increased fuel consumption, and further damage to components. It's best to address the code promptly to prevent more significant problems.

9. Can a DIY enthusiast fix OBDII code P16FF on a 2014 GMC Sierra?

Depending on the DIY enthusiast's skill level and access to tools, it may be possible to address code P16FF by replacing the ignition relay or checking the wiring. However, more complex diagnostics may require professional help.

10. How much does it cost to repair OBDII code P16FF on a 2014 GMC Sierra?

The cost of repairing code P16FF can vary depending on the underlying cause, parts needed for replacement, and labor charges. It's advisable to consult a mechanic for an accurate estimate based on your specific situation.

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