AutoCodes – Chevrolet – P11DA Chevrolet

P11DA Chevrolet 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 Chevrolet 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 521

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

What does this mean?

What are the Possible Causes of the DTC P11DA Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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Information for Specific Chevrolet Models

P11DA 2014 Chevrolet Silverado — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
P11DA 2015 Chevrolet Silverado — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
P11DA 2016 Chevrolet Silverado — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
P11DA 2017 Chevrolet Silverado — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
P11DA 2018 Chevrolet Silverado — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)

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 Chevrolet Code

1. What are the common symptoms of OBDII code P11DA in a Chevrolet related to the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- Common symptoms include reduced engine performance, increased fuel consumption, and illuminated check engine light.

2. What are the possible causes of OBDII code P11DA in a Chevrolet indicating O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning O2 pump, or issues with the engine control module (ECM).

3. How can I diagnose OBDII code P11DA in a Chevrolet for the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- Diagnose by using an OBDII scanner to read and interpret the code, inspecting the NOx sensor and related components for damage, and checking the wiring for any faults.

4. What are the repair options for resolving OBDII code P11DA in a Chevrolet linked to the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- Repair options may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, replacing the O2 pump, or reprogramming the ECM.

5. Can I drive my Chevrolet with OBDII code P11DA indicating O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety issues. It is best to address the problem promptly.

6. How much does it typically cost to repair OBDII code P11DA in a Chevrolet related to the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- The cost of repair can vary depending on the specific issue, but it may range from $200 to $800 for parts and labor.

7. Are there any preventative maintenance tips to avoid OBDII code P11DA in a Chevrolet associated with the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- Regularly servicing the vehicle, checking for any warning signs or unusual symptoms, and addressing any issues promptly can help prevent this code from appearing.

8. Can OBDII code P11DA in a Chevrolet related to the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) cause damage to other components if left untreated?

- Yes, leaving this issue unresolved can potentially cause damage to other engine components, decrease fuel efficiency, and lead to higher emissions.

9. Is it possible to reset OBDII code P11DA in a Chevrolet indicating O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) without addressing the underlying problem?

- While you can reset the code temporarily, the underlying issue will still persist, and the check engine light is likely to reappear until the problem is properly addressed.

10. How long does it typically take to repair OBDII code P11DA in a Chevrolet for the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)?

- Repair times can vary depending on the complexity of the issue and availability of parts, but it may take anywhere from a few hours to a full day to complete the repair.