AutoCodes – Generic – P11C7

P11C7 Code - NOx Sensor 2 Heater Ground Circuit

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: P11C7 indicates NOx Sensor 2 Heater Ground Circuit.
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 5,797

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 P11C7 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 P11C7 - NOx Sensor 2 Heater Ground Circuit - AutoCodes.com — P11C7 Code - NOx Sensor 2 Heater Ground Circuit

What does this mean?

What are the Possible Causes of the DTC P11C7?

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 P11C7?

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 P11C7 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 P11C7 code?

Need more information on how to fix the P11C7 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C7 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P11C7 Buick — NOx Sensor 2 Heater Ground Circuit
P11C7 Cadillac — NOx Sensor 2 Heater Ground Circuit
P11C7 Chevrolet — NOx Sensor 2 Heater Ground Circuit
P11C7 GMC — NOx Sensor 2 Heater Ground Circuit

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 P11C7 Code

1. What are the common symptoms of OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit?

- Common symptoms include poor engine performance, reduced fuel efficiency, illuminated Check Engine Light, and potential emissions issues.

2. What could be the possible causes of OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit?

- Possible causes may include a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning engine control module.

3. How can I diagnose the issue with OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and its wiring for damage, and testing the sensor's resistance.

4. What are some repair tips for resolving OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the NOx sensor if necessary, and resetting the fault code with an OBDII scanner.

5. Can driving with OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit cause further damage to the vehicle?

- Continuing to drive with this fault code may lead to increased emissions, reduced engine efficiency, and potential damage to other components in the emissions control system.

6. How much does it typically cost to repair OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit?

- The cost of repairs can vary depending on the specific cause of the issue, but it may range from $200 to $500 for parts and labor.

7. Is it possible to reset OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit without fixing the underlying issue?

- While you can reset the fault code temporarily, it is recommended to address the root cause to prevent ongoing emissions issues and potential damage to the vehicle.

8. Are there any DIY repair options for OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit?

- DIY options may include checking and cleaning the sensor connectors, inspecting for visible wiring damage, and replacing the NOx sensor if necessary with basic automotive knowledge.

9. How long does it typically take to repair OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit?

- The repair process can vary in time depending on the extent of the issue, but it may take anywhere from 1 to 3 hours at a professional repair shop.

10. Can OBDII code P11C7 related to NOx Sensor 2 Heater Ground Circuit be triggered by a loose gas cap?

- A loose gas cap is unlikely to trigger this specific fault code, as it is more related to the NOx sensor and its heater ground circuit.

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