AutoCodes – Buick – P16BD Buick

P16BD Buick Code - Engine Controls Ignition Relay Feedback Circuit 3 Low 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: P16BD Buick indicates Engine Controls Ignition Relay Feedback Circuit 3 Low 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 268

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 P16BD Buick 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 P16BD Buick - Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage - AutoCodes.com — P16BD Buick Code - Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage

What does this mean?

What are the Possible Causes of the DTC P16BD Buick?

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 P16BD Buick?

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 P16BD Buick 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 P16BD Buick Code

1. What are the common symptoms of OBDII code P16BD in a Buick related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage?

The common symptoms include rough idling, engine stalling, poor acceleration, and the illumination of the Check Engine Light.

2. What are some possible causes of the OBDII code P16BD Buick related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage?

Possible causes include a faulty ignition relay, damaged wiring or connectors in the ignition relay circuit, a weak battery or alternator, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the OBDII code P16BD in my Buick related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage?

Diagnosis typically involves checking the ignition relay, inspecting the wiring and connectors in the circuit, testing the battery and alternator, and scanning the ECM for any related fault codes.

4. Is it safe to continue driving my Buick with the OBDII code P16BD related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage?

It is not recommended to continue driving your vehicle with this code present, as it can lead to further damage to the engine or other components. It is best to have the issue diagnosed and repaired as soon as possible.

5. Can I repair the OBDII code P16BD Buick related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage myself?

Depending on your skill level and access to tools, you may be able to perform some basic checks like inspecting wiring and connectors. However, for more complex issues like diagnosing a faulty ECM, it is recommended to seek professional help.

6. Will resetting the Check Engine Light clear the OBDII code P16BD related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage?

Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing the code is not addressed and repaired, the light is likely to come back on after some driving cycles.

7. How much does it typically cost to repair the OBDII code P16BD Buick related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage?

The cost of repair can vary depending on the exact cause of the issue. Simple fixes like replacing a relay or repairing wiring may cost a few hundred dollars, while more complex repairs involving the ECM can be more expensive.

8. Are there any preventive maintenance tips to avoid encountering the OBDII code P16BD related to the Engine Controls Ignition Relay Feedback Circuit 3 Low Voltage in my Buick?

Regularly checking the condition of your battery, alternator, and ignition system can help prevent issues that may trigger this code. Keeping up with routine maintenance schedules can also help catch problems early.