AutoCodes – Cadillac – P119A Cadillac

P119A Cadillac Code - NOx Sensor 1 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, 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: P119A Cadillac indicates NOx Sensor 1 Signal 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 500

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P119A Cadillac 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 P119A Cadillac - NOx Sensor 1 Signal Circuit - AutoCodes.com — P119A Cadillac Code - NOx Sensor 1 Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P119A Cadillac?

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 P119A Cadillac?

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 P119A Cadillac 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.

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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 P119A Cadillac Code

1. What are the common symptoms of OBDII code P119A in a Cadillac related to the NOx Sensor 1 Signal Circuit?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and an illuminated check engine light.

2. What can cause OBDII code P119A in a Cadillac indicating an issue with the NOx Sensor 1 Signal Circuit?

- This code is commonly triggered by a faulty NOx sensor, damaged wiring or connectors, or issues with the sensor's power supply.

3. How can I diagnose the NOx Sensor 1 Signal Circuit issue causing OBDII code P119A in my Cadillac?

- Diagnosing this issue typically involves inspecting the NOx sensor connections, checking for damaged wiring, and testing the sensor's functionality using a multimeter.

4. Can driving with OBDII code P119A related to the NOx Sensor 1 Signal Circuit cause further damage to my Cadillac?

- Continuing to drive with this code may lead to increased emissions, reduced engine efficiency, and potential damage to other components over time.

5. What are some repair tips for resolving OBDII code P119A in a Cadillac associated with the NOx Sensor 1 Signal Circuit?

- Repair options include replacing the faulty NOx sensor, repairing damaged wiring, cleaning or replacing connectors, and resetting the code using an OBDII scanner.

6. Is it possible to reset OBDII code P119A related to the NOx Sensor 1 Signal Circuit in a Cadillac without fixing the underlying issue?

- While you can reset the code temporarily, it is essential to address the root cause to prevent the issue from reoccurring and potentially causing more significant problems.

7. How much does it typically cost to repair OBDII code P119A associated with the NOx Sensor 1 Signal Circuit in a Cadillac?

- Repair costs can vary depending on the exact cause of the issue, but expenses may include the cost of a new NOx sensor, labor for diagnostics and repair, and any additional parts needed.

8. Can a DIY enthusiast with some automotive knowledge fix OBDII code P119A in a Cadillac related to the NOx Sensor 1 Signal Circuit?

- Depending on the exact cause, DIY repairs may be possible for those with the necessary skills and tools, such as replacing the NOx sensor or repairing simple wiring issues.

9. How long does it take to repair OBDII code P119A in a Cadillac concerning the NOx Sensor 1 Signal Circuit?

- The repair time can vary based on the complexity of the issue and the availability of parts, but it typically takes a few hours to a day for a professional mechanic to diagnose and fix the problem.

10. Are there any preventive measures to avoid triggering OBDII code P119A related to the NOx Sensor 1 Signal Circuit in a Cadillac?

- Regular maintenance, such as checking and cleaning sensor connections, inspecting wiring for damage, and addressing engine performance issues promptly, can help prevent this code from appearing.