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AutoCodes – Generic – P11C5

P11C5 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 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 4,596
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 29, 2024
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Code P11C5 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 - NOx Sensor 1 Heater Ground Circuit - AutoCodes.com
P11C5 Code - NOx Sensor 1 Heater Ground Circuit
What does this mean?

What are the Possible Causes of the DTC P11C5?

  • 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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

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 Code

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

- Common symptoms include reduced engine performance, increased fuel consumption, and illuminated Check Engine light.

2. What are the possible causes of OBDII code P11C5 NOx Sensor 1 Heater Ground Circuit?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors, or a malfunctioning ECM (Engine Control Module).

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

- Diagnose the issue by using an OBDII scanner to read the code, inspecting the NOx sensor and related components for damage, and testing the sensor's resistance.

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

- It is not recommended to drive the vehicle with this code as it can lead to increased emissions and potential damage to the engine.

5. What steps can I take to repair OBDII code P11C5 NOx Sensor 1 Heater Ground Circuit?

- Repair steps may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, and resetting the fault code with an OBDII scanner.

6. Is it safe to ignore OBDII code P11C5 NOx Sensor 1 Heater Ground Circuit?

- Ignoring this code can lead to decreased fuel efficiency, increased emissions, and potential damage to the vehicle's engine components.

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

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

8. Can a DIY enthusiast fix OBDII code P11C5 NOx Sensor 1 Heater Ground Circuit?

- DIY enthusiasts with automotive repair experience may be able to diagnose and repair this code, but it is recommended to consult a professional for accurate diagnosis and repair.

9. Are there any preventive measures to avoid OBDII code P11C5 NOx Sensor 1 Heater Ground Circuit?

- Regular vehicle maintenance, including checking the NOx sensor and related components, can help prevent issues leading to this fault code.

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

- Repair time can vary depending on the specific issue, but it may take a few hours to a full day to diagnose and repair this fault code.

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