AutoCodes – Buick – P116D Buick

P116D Buick Code - O2 Pump Current Control Circuit (NOx Sensor 1)

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P116D Buick indicates O2 Pump Current Control Circuit (NOx Sensor 1).
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 397

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P116D Buick Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P116D Buick - O2 Pump Current Control Circuit (NOx Sensor 1) - AutoCodes.com — P116D Buick Code - O2 Pump Current Control Circuit (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116D Buick?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P116D 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 P116D 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 P116D Buick Code

1. What are the common symptoms of OBDII code P116D in a Buick related to the O2 Pump Current Control Circuit (NOx Sensor 1)?

- Common symptoms include poor engine performance, decreased fuel efficiency, and illumination of the check engine light.

2. What are the possible causes of OBDII code P116D in a Buick indicating an issue with the O2 Pump Current Control Circuit (NOx Sensor 1)?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning O2 pump, or issues with the engine control module.

3. How can I diagnose OBDII code P116D in my Buick related to the O2 Pump Current Control Circuit (NOx Sensor 1)?

- Diagnosis involves using an OBDII scanner to retrieve the specific fault code, inspecting the NOx sensor and associated wiring, and testing the O2 pump and related components for proper functionality.

4. What are the potential risks of ignoring OBDII code P116D in a Buick linked to the O2 Pump Current Control Circuit (NOx Sensor 1)?

- Ignoring this code may lead to increased emissions, potential damage to the catalytic converter, and continued poor engine performance.

5. Can I continue driving my Buick with OBDII code P116D related to the O2 Pump Current Control Circuit (NOx Sensor 1) without immediate repairs?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent further damage and ensure optimal performance.

6. Are there any DIY repair tips for resolving OBDII code P116D in a Buick associated with the O2 Pump Current Control Circuit (NOx Sensor 1)?

- DIY repair tips may include checking and cleaning the sensor connectors, inspecting for damaged wiring, and ensuring proper connections to the O2 pump.

7. How much does it typically cost to repair OBDII code P116D in a Buick involving the O2 Pump Current Control Circuit (NOx Sensor 1)?

- Repair costs can vary depending on the exact cause of the issue, but they may range from $200 to $600, including parts and labor.

8. Can a faulty O2 sensor trigger OBDII code P116D in a Buick related to the O2 Pump Current Control Circuit (NOx Sensor 1)?

- Yes, a malfunctioning O2 sensor can potentially trigger this code due to its crucial role in monitoring oxygen levels in the exhaust system.

9. Is it necessary to reset the OBDII system after repairing OBDII code P116D in a Buick associated with the O2 Pump Current Control Circuit (NOx Sensor 1)?

- Yes, resetting the OBDII system after repairs allows the vehicle to relearn the corrected parameters and ensures the check engine light is properly extinguished.

10. How can I prevent OBDII code P116D in my Buick related to the O2 Pump Current Control Circuit (NOx Sensor 1) from recurring in the future?

- To prevent recurrence, it is important to perform regular vehicle maintenance, address any engine performance issues promptly, and follow the manufacturer's recommended service intervals.