AutoCodes – GMC – P11DA 2017 GMC Sierra

P11DA 2017 GMC Sierra Code - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)

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 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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: P11DA 2017 GMC Sierra indicates O2 Pump Current Control Circuit High Voltage (NOx Sensor 2).
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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 242

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 Mar 24, 2024

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 P11DA 2017 GMC Sierra 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 the 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 P11DA 2017 GMC Sierra - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11DA 2017 GMC Sierra Code - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11DA 2017 GMC Sierra?

Faulty Nitrogen Oxides (NOx) Sensor 2
Nitrogen Oxides Sensor 2 harness is open or shorted
Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P11DA 2017 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 P11DA 2017 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.

Need more information about the P11DA 2017 GMC Sierra code?

Need more information on how to fix the P11DA 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11DA 2017 GMC Sierra 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 P11DA 2017 GMC Sierra Code

1. What does the OBDII code P11DA mean on a 2017 GMC Sierra?

P11DA indicates an issue with the O2 Pump Current Control Circuit High Voltage for NOx Sensor 2, which monitors nitrogen oxide emissions in the exhaust system.

2. What are the symptoms of code P11DA on a 2017 GMC Sierra?

Common symptoms include the Check Engine Light turning on, reduced engine performance, increased fuel consumption, and potentially higher emissions.

3. What causes the P11DA code on a 2017 GMC Sierra?

Possible causes include a malfunctioning NOx Sensor 2, damaged wiring or connectors in the O2 pump control circuit, or a faulty Engine Control Module (ECM).

4. How can I diagnose the P11DA code on my GMC Sierra?

Inspect the wiring and connectors for damage or corrosion, test the NOx Sensor 2 for functionality, and use a scan tool to monitor live data for abnormalities in the O2 pump current control circuit.

5. Can a faulty NOx Sensor 2 cause the P11DA code?

Yes, a malfunctioning NOx Sensor 2 is one of the most common causes of this code, as it directly impacts the O2 pump control circuit.

6. Is it safe to drive with the P11DA code on a 2017 GMC Sierra?

While the vehicle may remain drivable, it could experience reduced performance and higher emissions. Prolonged driving without addressing the issue may cause further damage.

7. How do I fix the P11DA code on a 2017 GMC Sierra?

Repairs may include replacing the NOx Sensor 2, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

8. How much does it cost to repair the P11DA code on a GMC Sierra?

Repair costs can vary, but replacing a NOx sensor typically ranges from $300 to $800, depending on parts and labor rates.

9. Can a software update fix the P11DA code on a 2017 GMC Sierra?

In some cases, a software update or ECM reprogramming from the dealership may resolve the issue, particularly if the problem is related to incorrect control logic.

10. How do I prevent the P11DA code from recurring on my GMC Sierra?

Regular maintenance, including inspecting the exhaust and sensor wiring, using the correct fuel, and addressing check engine lights promptly, can help prevent this code.