AutoCodes – Generic – P11C6

P11C6 Code - NOx Sensor 1 Heater Ground Circuit High

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, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P11C6 indicates NOx Sensor 1 Heater Ground Circuit High.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 1,328

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11C6 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 P11C6 - NOx Sensor 1 Heater Ground Circuit High - AutoCodes.com — P11C6 Code - NOx Sensor 1 Heater Ground Circuit High

What does this mean?

What are the Possible Causes of the DTC P11C6?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P11C6?

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 P11C6 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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Information for Specific Makes

P11C6 Buick — NOx Sensor 1 Heater Ground Circuit High
P11C6 Cadillac — NOx Sensor 1 Heater Ground Circuit High
P11C6 Chevrolet — NOx Sensor 1 Heater Ground Circuit High
P11C6 GMC — NOx Sensor 1 Heater Ground Circuit High

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 P11C6 Code

1. What are common symptoms of OBDII code P11C6 (NOx Sensor 1 Heater Ground Circuit High)?

- Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What can cause the OBDII code P11C6 to appear?

- The code P11C6 typically appears due to a malfunction in the NOx Sensor 1 heater ground circuit, often caused by a damaged sensor or wiring issue.

3. How serious is the NOx Sensor 1 Heater Ground Circuit High fault?

- While the vehicle may still be operable with this fault, it is essential to address it promptly to prevent further damage to the emission control system and ensure optimal engine performance.

4. Can I continue driving with the P11C6 code present?

- It is recommended to avoid prolonged driving with the P11C6 code as it can lead to increased emissions, potential damage to the catalytic converter, and reduced fuel efficiency.

5. How can I diagnose the NOx Sensor 1 Heater Ground Circuit High issue?

- Diagnosing the issue involves using an OBDII scanner to retrieve the specific fault code, inspecting the NOx Sensor 1 and its wiring for any visible damage, and testing the sensor's functionality.

6. What are the repair options for resolving the P11C6 fault?

- Repair options may include replacing the NOx Sensor 1, repairing damaged wiring or connectors, resetting the fault code, and conducting further diagnostic tests to ensure the issue is resolved.

7. Are there any DIY tips for addressing the NOx Sensor 1 Heater Ground Circuit High fault?

- While basic inspections can be done by DIY enthusiasts, it is recommended to seek professional help for accurate diagnosis and repair of the P11C6 fault to avoid further complications.

8. How much does it cost to repair the NOx Sensor 1 Heater Ground Circuit High fault?

- The cost of repair can vary depending on the extent of the issue, the need for sensor replacement, and labor costs. It is advisable to obtain quotes from reputable automotive service centers.

9. Can a faulty NOx Sensor 1 Heater Ground Circuit High impact vehicle emissions?

- Yes, a faulty NOx Sensor 1 can lead to increased emissions of nitrogen oxides (NOx), which are harmful pollutants that contribute to air pollution and environmental damage.

10. How can I prevent the recurrence of the P11C6 fault in the future?

- To prevent the recurrence of the P11C6 fault, it is essential to perform regular maintenance checks, address any underlying issues promptly, and follow the manufacturer's recommended service intervals for the emission control system.