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P11DA 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 279
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P11DA 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) - AutoCodes.com
P11DA 2015 Chevrolet Silverado Code - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11DA 2015 Chevrolet Silverado?

  • 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 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P11DA 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the 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 2015 Chevrolet Silverado Code

1. What does the OBDII code P11DA mean on a 2015 Chevrolet Silverado?

P11DA indicates "O2 Pump Current Control Circuit High Voltage" for NOx Sensor 2, meaning the system has detected an issue with the oxygen pump control circuit in the downstream NOx sensor.

2. What are the symptoms of code P11DA in a 2015 Chevrolet Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, and potential issues with emissions compliance.

3. What causes the P11DA code to appear in a 2015 Chevrolet Silverado?

Possible causes include a malfunctioning NOx sensor, wiring or connector issues in the oxygen pump control circuit, or a failed engine control module (ECM).

4. How do I diagnose the P11DA code on my Silverado?

Start by inspecting the NOx Sensor 2 wiring and connectors for damage or corrosion, check the sensor's voltage readings with a diagnostic tool, and test the oxygen pump circuit for proper operation.

5. Can I drive my 2015 Silverado with the P11DA code active?

While the truck may still be drivable, prolonged operation with this code could lead to increased emissions, reduced performance, and possible damage to the catalytic converter or other components.

6. How do I fix the P11DA code on a 2015 Chevrolet Silverado?

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

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

The cost will vary depending on the repair. Replacing an NOx sensor typically costs $300-$700, while wiring repairs or ECM replacement could add to the total.

8. What is NOx Sensor 2, and why is it important?

NOx Sensor 2 monitors nitrogen oxide levels in the exhaust after the catalytic converter, helping ensure optimal emissions control and compliance with regulations.

9. Can a faulty NOx sensor cause other issues in my Silverado?

Yes, a faulty NOx sensor can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time.

10. Do I need to clear the P11DA code after repairs?

Yes, after completing repairs, use an OBDII scanner to clear the code and verify that it doesn’t return during a test drive.

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