AutoCodes – Generic – P11DA

P11DA 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 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 980

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

What does this mean?

What are the Possible Causes of the DTC P11DA?

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?

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 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 code?

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

Need Help with the Code?

Get the P11DA code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P11DA Buick — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
P11DA Cadillac — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
P11DA Chevrolet — O2 Pump Current Control Circuit High Voltage (NOx Sensor 2)
P11DA GMC — 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 Code

1. What are the common symptoms of OBDII code P11DA?

- Common symptoms include decreased fuel efficiency, rough idling, loss of power, and illuminated Check Engine Light.

2. What causes the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) code P11DA?

- The P11DA code is typically caused by a malfunctioning NOx sensor, faulty wiring, or a problem with the O2 pump current control circuit.

3. How serious is the P11DA code?

- Ignoring the P11DA code can lead to increased emissions, possible damage to the catalytic converter, and potential failure to pass emissions tests.

4. Can I still drive my vehicle with the P11DA code present?

- It is not recommended to drive your vehicle with the P11DA code present, as it can negatively impact engine performance and emissions.

5. How can I diagnose the O2 Pump Current Control Circuit High Voltage (NOx Sensor 2) code P11DA?

- Diagnosing the P11DA code involves using an OBDII scanner to retrieve the code, testing the NOx sensor and related components, and checking for any faulty wiring.

6. How do I repair the P11DA code?

- Repairing the P11DA code may involve replacing the NOx sensor, repairing or replacing damaged wiring, and resetting the fault code with an OBDII scanner.

7. Are there any DIY tips for fixing the P11DA code?

- DIY tips include checking for loose or damaged wiring, ensuring proper connections to the NOx sensor, and following a detailed repair manual for guidance.

8. Can a faulty NOx sensor cause the P11DA code?

- Yes, a faulty NOx sensor is a common cause of the P11DA code, as it can lead to incorrect readings and trigger the high voltage current control circuit error.

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

- The cost of repairing the P11DA code can vary depending on the extent of the issue, but it may range from $200 to $500 for parts and labor.

10. How long does it take to repair the P11DA code?

- The repair time for the P11DA code can vary based on the specific issue, but it typically takes a few hours to a full day for diagnosis and repair by a qualified mechanic.