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P11C0 Cadillac Code - O2 Reference Voltage 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: P11C0 Cadillac indicates O2 Reference Voltage 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 370

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 P11C0 Cadillac 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 P11C0 Cadillac - O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11C0 Cadillac Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11C0 Cadillac?

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 P11C0 Cadillac?

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 P11C0 Cadillac 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.

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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 P11C0 Cadillac Code

1. What are the common symptoms of OBDII code P11C0 in a Cadillac related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Common symptoms include the check engine light being illuminated, decreased fuel efficiency, rough idling, and potential issues with emissions.

2. What are the possible causes of the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) error code P11C0 in a Cadillac?

- Common causes may include a faulty NOx sensor, damaged wiring or connectors in the O2 reference voltage circuit, or issues with the engine control module.

3. How can I diagnose the OBDII code P11C0 in my Cadillac related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Diagnosing this code typically involves using a scan tool to retrieve the specific error code, checking the NOx sensor and related wiring for any visible damage, and testing the voltage readings in the circuit.

4. Is it safe to continue driving my Cadillac with the OBDII code P11C0 and the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) issue?

- It is generally not recommended to continue driving with this error code present, as it can lead to further damage to the vehicle and potential issues with emissions compliance.

5. Can I reset the OBDII code P11C0 related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) in my Cadillac by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is not a permanent solution. It's important to diagnose and repair the underlying issue causing the code to prevent it from reoccurring.

6. How much does it typically cost to repair the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) error code P11C0 in a Cadillac?

- The cost of repair can vary depending on the exact cause of the issue. It may involve replacing the NOx sensor, repairing damaged wiring, or addressing issues with the engine control module. Costs can range from a few hundred to over a thousand dollars.

7. Are there any DIY tips for addressing the OBDII code P11C0 in a Cadillac related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- While some basic troubleshooting like checking for loose connections or damaged wiring can be done DIY, diagnosing and repairing the underlying cause of this code may require professional expertise and specialized tools.

8. How long does it typically take to repair the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) error code P11C0 in a Cadillac?

- The repair time can vary based on the extent of the issue and the specific components that need to be addressed. It can range from a few hours to a full day, depending on the complexity of the repair.

9. Can a faulty NOx sensor cause the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) error code P11C0 in a Cadillac?

- Yes, a faulty NOx sensor can be a common cause of this error code. If the sensor is not functioning properly, it can lead to issues with the O2 reference voltage circuit and trigger the P11C0 code.

10. Will driving with the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) error code P11C0 in my Cadillac affect the vehicle's performance?

- Driving with this error code present can potentially impact the vehicle's performance, fuel efficiency, and emissions output. It is advisable to address the underlying issue promptly to prevent any further issues.