AutoCodes – Chevrolet – P11C5 2014 Chevrolet Silverado

P11C5 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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 316

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 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11C5 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado - NOx Sensor 1 Heater Ground Circuit - AutoCodes.com — P11C5 2014 Chevrolet Silverado Code - NOx Sensor 1 Heater Ground Circuit

What does this mean?

What are the Possible Causes of the DTC P11C5 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P11C5 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P11C5 2014 Chevrolet Silverado Code

1. What does OBDII code P11C5 mean on a 2014 Chevrolet Silverado?

Code P11C5 indicates an issue with the NOx Sensor 1 Heater Ground Circuit, which affects the heating element of the upstream nitrogen oxide (NOx) sensor.

2. What are the common symptoms of P11C5 in a 2014 Chevrolet Silverado?

Common symptoms include the check engine light turning on, decreased fuel efficiency, possible reduced engine performance, and issues with emissions compliance.

3. What causes the P11C5 code to appear?

This code is typically caused by a faulty NOx sensor, damaged wiring, a poor ground connection, or a failed sensor heater circuit.

4. Can I drive my 2014 Chevrolet Silverado with a P11C5 code?

While the vehicle may still be drivable, prolonged operation with this code can lead to increased emissions, potential damage to the emissions system, and possible engine performance issues.

5. How do I diagnose the P11C5 code?

Diagnosis involves scanning for the code with an OBDII scanner, inspecting the NOx sensor wiring and ground connections, and testing the sensor's heater circuit for proper function.

6. How do I fix the P11C5 code on my 2014 Chevrolet Silverado?

Repairs might include replacing the faulty NOx sensor, repairing damaged wiring or connectors, or cleaning and securing the ground connection.

7. How much does it cost to fix the P11C5 code?

The cost can vary, but replacing a NOx sensor typically costs $300-$700, including parts and labor. Wiring repairs may cost less, depending on the extent of the damage.

8. Can a bad NOx sensor cause other problems?

Yes, a malfunctioning NOx sensor can lead to increased emissions, reduced fuel efficiency, and potential damage to other emissions system components.

9. What tools are needed to diagnose and repair P11C5?

Youâ€™ll need an OBDII scanner, a multimeter for testing circuits, and basic hand tools for inspecting and replacing components.

10. How can I prevent the P11C5 code from recurring?

Regular maintenance, inspecting wiring for damage, and ensuring proper grounding can help prevent this code from returning. Always address issues promptly to avoid further damage.