AutoCodes – Chevrolet – P11DA 2018 Chevrolet Silverado

P11DA 2018 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 2018 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 179

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 2018 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 2018 Chevrolet Silverado - O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11DA 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P11DA 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2018 Chevrolet Silverado Code

1. What does OBD-II code P11DA mean on a 2018 Chevrolet Silverado?

P11DA indicates "O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)," which means the ECM has detected a high voltage issue in the oxygen pump control circuit of the downstream NOx sensor.

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

Symptoms may include the check engine light turning on, reduced fuel efficiency, increased emissions, and potential performance issues such as rough idling or reduced power.

3. What causes the P11DA code to trigger?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, excessive exhaust system contamination, or a malfunctioning ECM.

4. How do I diagnose the P11DA code?

Start by using an OBD-II scanner to confirm the code. Then inspect the NOx sensor wiring and connectors for damage, test the sensor with a multimeter, and ensure proper voltage and ground connections.

5. Can I drive my 2018 Silverado with the P11DA code active?

While the vehicle may still be drivable, itâ€™s not recommended as it could lead to increased emissions, reduced engine performance, and potential long-term damage to the exhaust system.

6. How do I fix the P11DA code on my Silverado?

Repairs may involve replacing the NOx sensor, repairing damaged wiring or connectors, cleaning the exhaust system, or reprogramming/updating the ECM if necessary.

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

The cost depends on the exact repair needed. Replacing a NOx sensor typically costs $300â€“$700, while wiring repairs or ECM updates may vary in price.

8. Can a dirty exhaust system cause the P11DA code?

Yes, excessive exhaust contamination or soot buildup can affect the accuracy of the NOx sensor, potentially triggering the P11DA code.

9. Is the P11DA code covered under warranty for a 2018 Chevrolet Silverado?

It might be covered under the emissions warranty if your vehicle is still within the coverage period. Check with your dealer for warranty details.

10. What tools are needed to troubleshoot the P11DA code?

An OBD-II scanner, a digital multimeter, and basic tools for inspecting and repairing wiring are typically required for diagnosing and fixing this code.