AutoCodes – GMC – P11DA 2016 GMC Sierra

P11DA 2016 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 2016 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.

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Code Popularity 170

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 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11DA 2016 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 2016 GMC Sierra - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11DA 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?

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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 P11DA 2016 GMC Sierra Code

1. What does the OBDII code P11DA mean on a 2016 GMC Sierra?

Code P11DA indicates an issue with the O2 Pump Current Control Circuit High Voltage for NOx Sensor 2, meaning the sensor is detecting higher-than-expected voltage in the circuit.

2. What are the common symptoms of the P11DA code?

Symptoms include the Check Engine Light turning on, reduced fuel efficiency, possible engine performance issues, and increased emissions.

3. What causes the P11DA code to appear?

Common causes include a faulty NOx sensor 2, damaged wiring or connectors in the O2 pump circuit, or a malfunctioning sensor control module.

4. How do I diagnose the P11DA code on a 2016 GMC Sierra?

Start by scanning the vehicle with an OBDII tool to confirm the code. Then inspect the NOx sensor 2, wiring, and connectors for damage or corrosion, and test the circuit voltage.

5. Can a bad NOx sensor cause the P11DA code?

Yes, a faulty NOx sensor 2 is one of the most common reasons for this code, as it may send incorrect voltage signals to the ECM.

6. Is it safe to drive with the P11DA code?

While the vehicle may still be drivable, ignoring the code can lead to decreased fuel efficiency, higher emissions, and potential damage to other components over time.

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

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

8. How much does it cost to repair the P11DA code?

The cost varies based on the issue but typically ranges from $300 to $800, depending on whether the NOx sensor or wiring needs replacement.

9. Can a software update fix the P11DA code?

In some cases, an ECM reprogramming or software update from a GMC dealership can resolve the issue if itâ€™s related to incorrect system calibration.

10. How can I prevent the P11DA code from recurring?

Regular maintenance, including inspecting and cleaning electrical connections, checking the exhaust system, and using quality fuel, can help prevent this code from returning.