AutoCodes – GMC – P16BF GMC

P16BF GMC Code - Engine Controls Ignition Relay Feedback Circuit 3 High Voltage

Quick Answer

There are 4 ignition voltage circuits supplied to the Engine Control Module (ECM). 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: P16BF GMC indicates Engine Controls Ignition Relay Feedback Circuit 3 High Voltage.
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.

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Code Popularity 720

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16BF GMC Description

There are 4 ignition voltage circuits supplied to the Engine Control Module (ECM). Three are supplied by the Engine Controls Ignition Relay, and the other is supplied by the ignition main relay. The ECM monitors and compares the ignition voltage supplied by the 2 relays. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the voltage level difference is greater than 3 V between the Engine Controls Ignition Relay feedback circuit 3 and the ignition 1 signal circuit for greater than 1 s.

OBDII Code P16BF GMC - Engine Controls Ignition Relay Feedback Circuit 3 High Voltage - AutoCodes.com — P16BF GMC Code - Engine Controls Ignition Relay Feedback Circuit 3 High Voltage

What does this mean?

What are the Possible Causes of the DTC P16BF GMC?

Faulty Engine Controls Ignition Relay
Engine Controls Ignition Relay harness is open or shorted
Engine Controls Ignition Relay circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P16BF GMC?

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 P16BF GMC 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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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 P16BF GMC Code

1. What are the common symptoms of OBDII code P16BF GMC?

The common symptoms of code P16BF GMC may include engine misfires, rough idling, difficulty starting the engine, and a decrease in fuel efficiency.

2. What are the possible causes of OBDII code P16BF GMC?

Possible causes of code P16BF GMC include a faulty ignition relay, wiring issues in the ignition relay circuit, a malfunctioning engine control module (ECM), or a poor connection in the circuit.

3. How can I diagnose the cause of OBDII code P16BF GMC?

Diagnosing code P16BF GMC involves using a scan tool to retrieve the code, checking the ignition relay and related wiring for faults, testing the ECM, and inspecting the circuit for any loose connections or corrosion.

4. Can I continue driving my vehicle with OBDII code P16BF GMC?

It is not recommended to drive your vehicle with an active code P16BF GMC, as it can lead to further damage to the engine and potentially cause safety hazards on the road.

5. How is OBDII code P16BF GMC typically repaired?

Repairing code P16BF GMC usually involves replacing the faulty ignition relay, repairing any damaged wiring in the circuit, resetting the ECM, and clearing the trouble code from the system.

6. Are there any DIY tips for fixing OBDII code P16BF GMC?

While diagnosing and repairing code P16BF GMC may require specialized tools and knowledge, DIY enthusiasts can start by checking the ignition relay and related wiring for visible damage or loose connections.

7. How much does it cost to fix OBDII code P16BF GMC at a repair shop?

The cost of fixing OBDII code P16BF GMC at a repair shop can vary depending on the specific issue, location, and labor rates, but it may range from $100 to $300 or more.

8. Can a faulty ignition relay cause OBDII code P16BF GMC?

Yes, a faulty ignition relay can cause OBDII code P16BF GMC to trigger, as it may disrupt the proper functioning of the ignition relay feedback circuit.

9. Is OBDII code P16BF GMC a serious issue that needs immediate attention?

While code P16BF GMC may not always indicate a severe problem, it should be addressed promptly to prevent potential engine damage and ensure the vehicle operates correctly.

10. How long does it take to fix OBDII code P16BF GMC?

The time it takes to fix OBDII code P16BF GMC can vary depending on the exact cause of the issue, but it typically takes a few hours to diagnose and repair the problem.