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AutoCodes – Chevrolet – P11C7 2018 Chevrolet Silverado

P11C7 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 272
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P11C7 2018 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 P11C7 2018 Chevrolet Silverado - NOx Sensor 2 Heater Ground Circuit - AutoCodes.com
P11C7 2018 Chevrolet Silverado Code - NOx Sensor 2 Heater Ground Circuit
What does this mean?

What are the Possible Causes of the DTC P11C7 2018 Chevrolet Silverado?

  • 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 2018 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 P11C7 2018 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 P11C7 2018 Chevrolet Silverado code?

Need more information on how to fix the P11C7 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C7 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2018 Chevrolet Silverado Code

1. What does the OBDII code P11C7 mean on a 2018 Chevrolet Silverado?

The code P11C7 indicates an issue with the NOx Sensor 2 Heater Ground Circuit, which is responsible for heating the NOx sensor to ensure accurate emissions readings.

2. What are the symptoms of a P11C7 code in a Chevrolet Silverado?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

3. What causes the P11C7 code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the sensor ground circuit, or a malfunctioning engine control module (ECM).

4. Can I drive my 2018 Silverado with a P11C7 code?

While the vehicle may still be drivable, it could experience reduced performance and increased emissions. Driving for an extended period without repair could lead to further damage.

5. How do I fix the P11C7 code on my Silverado?

Repairs may include inspecting and repairing damaged wiring or connectors, replacing the NOx sensor, or reprogramming or replacing the ECM if necessary.

6. How do I diagnose the P11C7 code on a 2018 Chevrolet Silverado?

Start by using an OBDII scanner to confirm the code, then visually inspect the wiring and connectors for damage. Check the ground circuit for continuity and test the NOx sensor for proper operation.

7. How much does it cost to repair a P11C7 code?

The cost can vary, but replacing a NOx sensor typically ranges from $300 to $500, including parts and labor. Wiring repairs may cost less, depending on the extent of the damage.

8. Can a P11C7 code cause emissions test failure?

Yes, a faulty NOx sensor or circuit can cause increased emissions, leading to a failed emissions test.

9. What role does NOx Sensor 2 play in the Silverado's emissions system?

NOx Sensor 2 monitors nitrogen oxide levels in the exhaust, helping the ECM adjust engine performance to meet emissions standards.

10. Can a faulty NOx sensor heater affect engine performance?

Yes, if the heater doesn’t work, the NOx sensor may not function correctly, leading to inaccurate emissions data and reduced engine efficiency.

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