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P119D Chevrolet Code - NOx Sensor 2 Signal 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
P119D Chevrolet indicates NOx Sensor 2 Signal 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 1,024
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 P119D 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 P119D Chevrolet - NOx Sensor 2 Signal Circuit - AutoCodes.com
P119D Chevrolet Code - NOx Sensor 2 Signal Circuit
What does this mean?

What are the Possible Causes of the DTC P119D Chevrolet?

  • 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 P119D 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 P119D 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 P119D Chevrolet code?

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Need Help with the Code?

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Information for Specific Chevrolet Models

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 P119D Chevrolet Code

1. What does the OBDII code P119D mean on a Chevrolet?

P119D indicates an issue with the NOx Sensor 2 Signal Circuit, which refers to the downstream nitrogen oxide sensor detecting an abnormal signal.

2. What are the common symptoms of a P119D code?

Common symptoms include a check engine light, reduced fuel efficiency, increased emissions, or the vehicle going into limp mode.

3. What causes the P119D code to appear?

Possible causes include a faulty NOx sensor 2, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

4. Can driving with a P119D code damage my Chevrolet?

Driving with a P119D code can lead to higher emissions and potential damage to the catalytic converter over time if not addressed.

5. How can I diagnose the P119D code on my Chevrolet?

Diagnose by using an OBDII scanner to confirm the code, inspecting the NOx sensor 2 and its wiring for damage, and testing the circuit for proper voltage or resistance.

6. How do I fix the P119D code?

Repairs may include replacing the NOx sensor 2, repairing damaged wiring, cleaning corroded connectors, or reprogramming the ECM if needed.

7. How much does it cost to fix a P119D code on a Chevrolet?

The repair cost varies but typically ranges from $200 to $600, depending on whether the NOx sensor needs replacement or wiring repairs are required.

8. Can a P119D code be caused by bad fuel quality?

Yes, poor fuel quality can cause issues with emissions and sensor readings, potentially triggering the P119D code.

9. Is the NOx sensor 2 the same as an oxygen sensor?

No, a NOx sensor measures nitrogen oxide levels in the exhaust, while an oxygen sensor measures oxygen levels to optimize air-fuel mixture.

10. Do I need to replace both NOx sensors if I get a P119D code?

Not necessarily. The code specifically refers to NOx sensor 2, but it’s a good idea to inspect both sensors for proper function.

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