AutoCodes – GMC – P119C 2017 GMC Sierra

P119C 2017 GMC Sierra Code - NOx Sensor 1 Signal Circuit High Voltage

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: P119C 2017 GMC Sierra indicates NOx Sensor 1 Signal Circuit High Voltage.
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 178

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 P119C 2017 GMC Sierra 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 P119C 2017 GMC Sierra - NOx Sensor 1 Signal Circuit High Voltage - AutoCodes.com — P119C 2017 GMC Sierra Code - NOx Sensor 1 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119C 2017 GMC Sierra?

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 P119C 2017 GMC Sierra?

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 P119C 2017 GMC Sierra 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 P119C 2017 GMC Sierra 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 P119C 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P119C in a 2017 GMC Sierra related to NOx Sensor 1 Signal Circuit High Voltage?

- Common symptoms include the Check Engine light illuminating, reduced engine performance, and potential decrease in fuel efficiency.

2. What are the possible causes of OBDII code P119C in a 2017 GMC Sierra indicating NOx Sensor 1 Signal Circuit High Voltage?

- Possible causes may include a faulty NOx sensor, wiring issues in the sensor circuit, a malfunctioning sensor heater, or an issue with the engine control module (ECM).

3. How can I diagnose the OBDII code P119C in my 2017 GMC Sierra associated with NOx Sensor 1 Signal Circuit High Voltage?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the NOx sensor and its connections, inspecting the wiring for damage, and testing the sensor heater.

4. Can I continue driving my 2017 GMC Sierra with OBDII code P119C related to NOx Sensor 1 Signal Circuit High Voltage?

- It is not recommended to drive the vehicle with this code as it can lead to further damage and potential emissions issues. It is best to address the problem promptly.

5. How can I repair OBDII code P119C in my 2017 GMC Sierra attributed to NOx Sensor 1 Signal Circuit High Voltage?

- Repair options may include replacing the faulty NOx sensor, repairing or replacing damaged wiring, addressing issues with the sensor heater, or reprogramming the ECM if necessary.

6. Are there any DIY tips for resolving OBDII code P119C in a 2017 GMC Sierra related to NOx Sensor 1 Signal Circuit High Voltage?

- While some basic checks like inspecting sensor connections and wiring can be done by DIY enthusiasts, it is recommended to seek professional help for accurate diagnosis and repair.

7. How much does it typically cost to fix OBDII code P119C in a 2017 GMC Sierra linked to NOx Sensor 1 Signal Circuit High Voltage?

- The cost of repair can vary depending on the specific issue, parts needed, and labor rates. It is advisable to get estimates from reputable auto repair shops.

8. Can a faulty NOx sensor cause other issues in my 2017 GMC Sierra besides triggering OBDII code P119C related to NOx Sensor 1 Signal Circuit High Voltage?

- Yes, a faulty NOx sensor can potentially impact the vehicle's emissions control system and overall engine performance if left unresolved.

9. Will resetting the OBDII system clear the P119C code in my 2017 GMC Sierra associated with NOx Sensor 1 Signal Circuit High Voltage?

- Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving cycles.

10. How important is it to address OBDII code P119C in a 2017 GMC Sierra concerning NOx Sensor 1 Signal Circuit High Voltage promptly?

- It is crucial to address this code promptly to prevent further damage to the vehicle, ensure optimal engine performance, and maintain compliance with emissions regulations.