AutoCodes – Buick – P16D7 Buick

P16D7 Buick Code - Sensor Supply Voltage Relay Control Circuit

Quick Answer

The Reductant Control Module Relay 1 & 2 supply ignition voltage to the Reductant Control Module. Common causes include Faulty Reductant Control Module Relay, Reductant Control Module Relay harness is open or shorted, Reductant Control Module 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: P16D7 Buick indicates Sensor Supply Voltage Relay Control Circuit.
Common causes: Common causes include Faulty Reductant Control Module Relay, Reductant Control Module Relay harness is open or shorted, Reductant Control Module 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 483

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P16D7 Buick Description

The Reductant Control Module Relay 1 & 2 supply ignition voltage to the Reductant Control Module. The Reductant Control Module Relay 2 also supplies ignition voltage to Nitrogen Oxide Sensor 1 & 2 and the Exhaust Particulate Matter Sensor. Both Reductant Control Module Relay 1&2 are controlled by a low side driver in the Engine Control Module (ECM).
The Diagnostic Trouble Code (DTC) will be set when the ECM detects an open circuit, short to voltage or short to ground on the Reductant Control Module Relay control circuit.

OBDII Code P16D7 Buick - Sensor Supply Voltage Relay Control Circuit - AutoCodes.com — P16D7 Buick Code - Sensor Supply Voltage Relay Control Circuit

What does this mean?

What are the Possible Causes of the DTC P16D7 Buick?

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

How to Fix the DTC P16D7 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 P16D7 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.

Need more information about the P16D7 Buick code?

Need more information on how to fix the P16D7 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16D7 Buick code diagnosed by a professional: Find a repair shop in your area

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 P16D7 Buick Code

1. What are common symptoms of OBDII code P16D7 in a Buick related to the Sensor Supply Voltage Relay Control Circuit?

- Common symptoms include engine misfires, reduced fuel efficiency, and difficulty starting the vehicle.

2. What are possible causes of the P16D7 code in a Buick?

- Possible causes include a faulty sensor supply voltage relay, damaged wiring or connectors, or a malfunctioning sensor.

3. How can I diagnose the Sensor Supply Voltage Relay Control Circuit issue in my Buick?

- Use a multimeter to test the voltage output of the relay, check the wiring for any visible damage, and inspect the sensor for proper connection and function.

4. Can I drive my Buick with the P16D7 code present?

- It is not recommended to drive your vehicle with the P16D7 code as it may lead to further damage and potentially unsafe driving conditions.

5. How do I repair the Sensor Supply Voltage Relay Control Circuit issue in my Buick?

- Repair typically involves replacing the faulty relay, repairing any damaged wiring or connectors, and ensuring proper connection of the sensor.

6. Is it possible to reset the P16D7 code in a Buick without repairing the issue?

- While clearing the code may temporarily turn off the check engine light, the underlying issue causing the code will persist until properly repaired.

7. Can a DIY enthusiast fix the Sensor Supply Voltage Relay Control Circuit problem in a Buick?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair the issue, but it is recommended to seek professional help for accurate diagnosis and repair.

8. How much does it typically cost to repair the P16D7 code in a Buick?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Will the P16D7 code cause my Buick to fail an emissions test?

- Yes, the P16D7 code may cause your Buick to fail an emissions test due to the impact on engine performance and emissions control systems.

10. How can I prevent the recurrence of the P16D7 code in my Buick?

- Regular maintenance, such as checking and replacing worn components, ensuring proper wiring connections, and addressing any warning signs promptly, can help prevent the recurrence of the P16D7 code.