AutoCodes – Cadillac – P119F Cadillac

P119F Cadillac Code - NOx Sensor 2 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 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: P119F Cadillac indicates NOx Sensor 2 Signal Circuit High Voltage.
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 538

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P119F 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 P119F Cadillac - NOx Sensor 2 Signal Circuit High Voltage - AutoCodes.com — P119F Cadillac Code - NOx Sensor 2 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119F Cadillac?

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 P119F 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 P119F 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 P119F Cadillac Code

1. What are the common symptoms of a P119F Cadillac OBDII code?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the Check Engine light.

2. What causes the NOx Sensor 2 Signal Circuit High Voltage code in a Cadillac?

- The code P119F is typically triggered by issues such as a faulty NOx sensor, wiring harness problems, or issues with the engine control module.

3. How serious is the P119F OBDII code in a Cadillac?

- While the vehicle may still be drivable with this code present, it is important to address it promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

4. Can I continue driving my Cadillac with the NOx Sensor 2 Signal Circuit High Voltage code?

- It is not advisable to continue driving the vehicle with this code present, as it can lead to increased emissions, reduced fuel efficiency, and potential long-term damage to the engine components.

5. How can I diagnose and repair the P119F code in my Cadillac?

- Diagnosis involves using a diagnostic scanner to pinpoint the exact cause of the code. Repair may involve replacing the NOx sensor, repairing the wiring harness, or reprogramming the engine control module.

6. Will resetting the Check Engine light make the P119F code go away permanently?

- Simply resetting the Check Engine light will not permanently resolve the issue. The underlying problem causing the P119F code needs to be diagnosed and repaired to prevent it from recurring.

7. Are there any DIY tips for troubleshooting the P119F Cadillac OBDII code?

- While some basic troubleshooting steps can be taken, diagnosing and repairing the NOx Sensor 2 Signal Circuit High Voltage code often requires specialized tools and expertise, so it is recommended to seek professional help.

8. How much does it typically cost to repair the P119F code in a Cadillac?

- The cost of repairing the P119F code can vary depending on the exact cause of the issue and the labor rates in your area. It is advisable to get a diagnostic assessment from a qualified mechanic for an accurate estimate.

9. Can a P119F Cadillac code affect the vehicle's emissions testing results?

- Yes, the presence of the P119F code can lead to increased emissions, which may cause the vehicle to fail emissions testing. It is important to address this code before undergoing emissions testing.

10. How often does the NOx Sensor 2 Signal Circuit High Voltage code occur in Cadillac vehicles?

- While not extremely common, the P119F code can occur in Cadillac vehicles, especially in models equipped with NOx sensors. Regular maintenance and prompt diagnosis of Check Engine lights can help prevent this code from appearing.