AutoCodes – Chevrolet – P11DA 2016 Chevrolet Silverado

P11DA 2016 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 2016 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 212

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 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 2016 Chevrolet Silverado - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11DA 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado 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 Chevrolet Silverado Code

1. What does the OBDII code P11DA mean on a 2016 Chevrolet Silverado?

The P11DA code indicates "O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)," meaning the vehicle's computer has detected an abnormally high voltage in the oxygen pump circuit for the second NOx sensor.

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

Symptoms may include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and potential issues with emissions system functionality.

3. What causes the P11DA code to appear in a 2016 Silverado?

Common causes include a faulty NOx sensor 2, damaged wiring or connectors in the sensor circuit, a malfunctioning engine control module (ECM), or excessive soot buildup on the sensor.

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

While the vehicle may still be drivable, driving with this code active can lead to reduced performance and fuel efficiency, and may cause long-term damage to the emissions system if not addressed.

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

Start by inspecting the wiring and connectors for the NOx sensor 2 for damage or loose connections. Use a diagnostic scan tool to monitor sensor voltage and verify the issue, and check for soot or contamination on the sensor.

6. How do I fix the P11DA code on a 2016 Chevrolet Silverado?

Repairs may include replacing the NOx sensor 2, repairing or replacing damaged wiring or connectors, cleaning excessive soot buildup, or reprogramming/updating the ECM if needed.

7. What is NOx sensor 2 in a Silverado, and what does it do?

NOx sensor 2 is part of the emissions system and measures nitrogen oxide levels in the exhaust gas after it passes through the SCR (Selective Catalytic Reduction) system to ensure proper emissions control.

8. How much does it cost to repair the P11DA code on a 2016 Chevrolet Silverado?

Costs can vary but typically range from $200 to $600, depending on whether the NOx sensor needs replacement or if additional repairs, such as wiring fixes, are required.

9. Can a software update fix the P11DA code on my Silverado?

In some cases, a software update or reprogramming of the ECM can resolve the issue if the problem is related to incorrect calibration or software glitches.

10. How can I prevent the P11DA code from reoccurring in my Silverado?

Regular maintenance, such as cleaning the emissions system, avoiding low-quality fuel, and promptly addressing check engine light warnings, can help prevent this code from reappearing.