AutoCodes – Chevrolet – P11C5 Chevrolet

P11C5 Chevrolet Code - NOx Sensor 1 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, 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: P11C5 Chevrolet indicates NOx Sensor 1 Heater Ground Circuit.
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 2,765

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 P11C5 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 P11C5 Chevrolet - NOx Sensor 1 Heater Ground Circuit - AutoCodes.com — P11C5 Chevrolet Code - NOx Sensor 1 Heater Ground Circuit

What does this mean?

What are the Possible Causes of the DTC P11C5 Chevrolet?

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 P11C5 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 P11C5 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 P11C5 Chevrolet code?

Need more information on how to fix the P11C5 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C5 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11C5 2014 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit
P11C5 2015 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit
P11C5 2016 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit
P11C5 2017 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit
P11C5 2018 Chevrolet Silverado — NOx Sensor 1 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 P11C5 Chevrolet Code

1. What are common symptoms of OBDII code P11C5 Chevrolet related to the NOx Sensor 1 Heater Ground Circuit?

- Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What causes the OBDII code P11C5 Chevrolet to trigger for the NOx Sensor 1 Heater Ground Circuit?

- The code is typically triggered by a malfunction in the NOx sensor 1 heater ground circuit, which can be caused by wiring issues, a faulty sensor, or a problem with the vehicle's electronic control module (ECM).

3. How can I diagnose the OBDII code P11C5 Chevrolet related to the NOx Sensor 1 Heater Ground Circuit?

- Diagnosing the issue involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and its wiring for any visible damage, and testing the sensor's resistance with a multimeter.

4. Can I drive my vehicle with the OBDII code P11C5 Chevrolet triggered for the NOx Sensor 1 Heater Ground Circuit?

- It is not recommended to drive your vehicle with this code triggered, as it can lead to further damage to the engine and emissions system. It's best to address the issue promptly.

5. How can I repair the OBDII code P11C5 Chevrolet for the NOx Sensor 1 Heater Ground Circuit?

- Repair options may include repairing or replacing damaged wiring, replacing the NOx sensor if it is faulty, or reprogramming the ECM to address any communication issues.

6. Is it possible to reset the OBDII code P11C5 Chevrolet for the NOx Sensor 1 Heater Ground Circuit without repairing the issue?

- While you can clear the code with an OBDII scanner, the underlying issue causing the code will still remain unresolved. It's crucial to address the root cause of the problem to prevent further issues.

7. How much does it typically cost to repair the OBDII code P11C5 Chevrolet related to the NOx Sensor 1 Heater Ground Circuit?

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

8. Can a DIY enthusiast repair the OBDII code P11C5 Chevrolet for the NOx Sensor 1 Heater Ground Circuit?

- While some experienced DIY enthusiasts may be able to address this issue, it is recommended to consult a professional mechanic due to the complexity of diagnosing and repairing electrical components.

9. Are there any preventative measures to avoid triggering the OBDII code P11C5 Chevrolet for the NOx Sensor 1 Heater Ground Circuit?

- Regular maintenance, such as checking and cleaning electrical connections, can help prevent issues with the NOx sensor and its heater ground circuit.

10. How long does it typically take to repair the OBDII code P11C5 Chevrolet for the NOx Sensor 1 Heater Ground Circuit?

- The repair time can vary depending on the exact cause of the issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the problem.