AutoCodes – Cadillac – P119C Cadillac

P119C Cadillac 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 Cadillac 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 334

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P119C 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 P119C Cadillac - NOx Sensor 1 Signal Circuit High Voltage - AutoCodes.com — P119C Cadillac Code - NOx Sensor 1 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119C 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 P119C 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 P119C 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 P119C Cadillac Code

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

The common symptoms include the check engine light illuminating, reduced engine performance, failed emissions test, and potentially increased fuel consumption.

2. What are the possible causes of the NOx Sensor 1 Signal Circuit High Voltage error code P119C in a Cadillac?

Potential causes may include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, issues with the engine control module (ECM), or exhaust system problems.

3. How serious is the OBDII code P119C related to the NOx Sensor 1 Signal Circuit High Voltage in a Cadillac?

While the severity may vary, it is important to address this issue promptly as it can lead to decreased engine efficiency, increased emissions, and potential damage to the catalytic converter over time.

4. Can I continue driving my Cadillac with the P119C fault code related to the NOx sensor?

It is generally not recommended to continue driving with this fault code present, as it can impact the vehicle's performance and emissions. It is advisable to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose and repair the NOx Sensor 1 Signal Circuit High Voltage issue in my Cadillac?

Diagnosis typically involves using an OBDII scanner to retrieve the fault code, checking the NOx sensor and its wiring for any visible damage, and testing the sensor's functionality. Repair may involve replacing the NOx sensor, repairing or replacing damaged wiring, or addressing any ECM issues.

6. Will resetting the fault codes make the P119C error related to the NOx sensor go away?

Resetting the fault codes may temporarily clear the check engine light, but if the underlying issue causing the P119C code is not addressed, the code is likely to reappear once the vehicle is driven and the ECM performs another diagnostic check.

7. How much does it typically cost to repair the P119C NOx Sensor 1 Signal Circuit High Voltage error code in a Cadillac?

The cost of repair can vary depending on the specific cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is advisable to consult a mechanic or dealership for an accurate estimate.

8. Can a DIY enthusiast fix the P119C fault code related to the NOx sensor in a Cadillac?

While some experienced DIY enthusiasts may be able to diagnose and repair simple issues related to the NOx sensor, diagnosing and repairing complex electrical or sensor problems may require specialized tools and expertise best left to professionals.

9. What is the function of the NOx sensor in a Cadillac, and why is it important?

The NOx sensor measures the level of nitrogen oxide in the vehicle's exhaust gases, helping the ECM optimize fuel-air mixture for efficient combustion and reduce harmful emissions. It is crucial for meeting emissions standards and ensuring proper engine performance.

10. How often should the NOx sensor be inspected or replaced in a Cadillac to prevent issues like the P119C fault code?

Regular maintenance schedules may vary, but it is advisable to follow the manufacturer's recommendations for sensor inspection and replacement intervals to prevent issues like the P119C code and ensure optimal vehicle performance and emissions compliance.