P16FF 2018 GMC Sierra Code - Engine Controls Ignition Relay Request Signal Message Counter Incorrect
Quick Answer
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay 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
- P16FF 2018 GMC Sierra indicates Engine Controls Ignition Relay Request Signal Message Counter Incorrect.
- Common causes
- Common causes include Faulty Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay 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.
Code P16FF 2018 GMC Sierra Description
What are the Possible Causes of the DTC P16FF 2018 GMC Sierra?
- Faulty Engine Controls Ignition Relay
- Engine Controls Ignition Relay harness is open or shorted
- Engine Controls Ignition Relay circuit poor electrical connection
How to Fix the DTC P16FF 2018 GMC Sierra?
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 P16FF 2018 GMC Sierra 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.
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Frequently Asked Questions about P16FF 2018 GMC Sierra Code
1. What does the OBDII code P16FF mean on a 2018 GMC Sierra?
P16FF indicates that the Engine Control Module (ECM) has detected an issue with the ignition relay request signal message counter, which may cause communication errors in the ignition system.
2. What are common symptoms of the P16FF code on a 2018 GMC Sierra?
Symptoms may include difficulty starting the engine, stalling, reduced engine performance, or the Check Engine Light being illuminated.
3. What causes the P16FF code to appear on a 2018 GMC Sierra?
The code is typically caused by a malfunctioning ignition relay, poor electrical connections, a faulty ECM, or wiring issues in the ignition system.
4. Can I drive my 2018 GMC Sierra with the P16FF code?
Driving with this code is not recommended, as it can lead to inconsistent engine performance or stalling, which could pose a safety risk.
5. How do you diagnose the P16FF code on a 2018 GMC Sierra?
Diagnosis involves using an OBDII scanner to confirm the code, inspecting the ignition relay and wiring for damage, and testing the ECM for proper function.
6. How do you fix the P16FF code on a 2018 GMC Sierra?
Repairs may include replacing the ignition relay, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to fix the P16FF code on a 2018 GMC Sierra?
Repair costs vary, but replacing an ignition relay typically costs $50–$150, while ECM repairs or replacements can range from $500–$1,500.
8. Can a dead battery cause the P16FF code on a 2018 GMC Sierra?
A weak or dead battery can cause voltage fluctuations that might trigger the P16FF code, but it’s not a common cause.
9. Will clearing the P16FF code solve the problem on a 2018 GMC Sierra?
Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return.
10. Is the P16FF code a common issue on the 2018 GMC Sierra?
The P16FF code is not a widespread issue, but it can occur due to electrical or communication faults specific to the ignition system.
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