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P119E Cadillac Code - NOx Sensor 2 Signal Circuit Low 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: P119E Cadillac indicates NOx Sensor 2 Signal Circuit Low 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 321

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 P119E 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 P119E Cadillac - NOx Sensor 2 Signal Circuit Low Voltage - AutoCodes.com — P119E Cadillac Code - NOx Sensor 2 Signal Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P119E 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 P119E 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 P119E 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 P119E Cadillac Code

1. What are common symptoms of OBDII code P119E in a Cadillac related to NOx Sensor 2 Signal Circuit Low Voltage?

Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of the NOx Sensor 2 Signal Circuit Low Voltage code in a Cadillac?

Potential causes may include a faulty NOx sensor, damaged wiring or connectors, a failed sensor heater circuit, or issues with the engine control module.

3. How can I diagnose the NOx Sensor 2 Signal Circuit Low Voltage issue in my Cadillac?

Diagnosis typically involves using an OBDII scanner to retrieve the specific code, inspecting the NOx sensor and its connections, and testing the sensor's voltage and resistance.

4. Can I continue driving my Cadillac with the P119E code related to NOx Sensor 2 Signal Circuit Low Voltage?

It is not recommended to drive for an extended period with this code present, as it can lead to increased emissions, potential damage to the catalytic converter, and further engine issues.

5. What is the repair process for resolving the NOx Sensor 2 Signal Circuit Low Voltage fault in a Cadillac?

Repair may involve replacing the NOx sensor, repairing damaged wiring or connectors, checking and repairing the sensor heater circuit, or reprogramming the engine control module.

6. Are there any DIY tips for fixing the P119E code in a Cadillac?

While some may attempt to diagnose and repair this issue themselves, it is recommended to consult a professional mechanic or dealership due to the complexity of the NOx sensor system.

7. How much does it typically cost to repair the NOx Sensor 2 Signal Circuit Low Voltage problem in a Cadillac?

Costs can vary depending on the specific cause of the issue, but it may range from $200 to $600 for parts and labor at a dealership or repair shop.

8. Can a faulty NOx sensor affect the emissions output of my Cadillac?

Yes, a malfunctioning NOx sensor can lead to increased emissions of harmful gases, which may cause the vehicle to fail emissions tests and contribute to environmental pollution.

9. Is the NOx Sensor 2 Signal Circuit Low Voltage code a common issue in Cadillac vehicles?

While not extremely common, this code can occur in Cadillac vehicles equipped with NOx sensor systems, especially in models with high mileage or older age.

10. How can I prevent the recurrence of the P119E code related to NOx Sensor 2 Signal Circuit Low Voltage in my Cadillac?

Regular maintenance, timely repairs of sensor-related issues, and using high-quality fuel can help prevent the reoccurrence of this fault in your Cadillac.