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P1004 Cadillac Code - NOx Sensor 2 Slow Response

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: P1004 Cadillac indicates NOx Sensor 2 Slow Response.
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 801

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 P1004 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 P1004 Cadillac - NOx Sensor 2 Slow Response - AutoCodes.com — P1004 Cadillac Code - NOx Sensor 2 Slow Response

What does this mean?

What are the Possible Causes of the DTC P1004 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 P1004 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 P1004 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 P1004 Cadillac Code

1. What are the common symptoms of OBDII code P1004 in a Cadillac related to NOx Sensor 2 Slow Response?

- Common symptoms may include decreased fuel efficiency, rough idling, loss of power, and the illumination of the check engine light.

2. What causes the OBDII code P1004 in a Cadillac indicating NOx Sensor 2 Slow Response?

- Possible causes include a faulty NOx sensor, wiring issues, exhaust system leaks, or a problem with the engine control module.

3. How serious is the OBDII code P1004 related to NOx Sensor 2 Slow Response in a Cadillac?

- While the vehicle may still be driveable with this code, it is important to address it promptly to prevent potential damage to the catalytic converter or other components.

4. Can I continue driving my Cadillac with the OBDII code P1004 indicating NOx Sensor 2 Slow Response?

- It is generally not recommended to drive with this code present, as it can affect the vehicle's performance and emissions. It is best to have the issue diagnosed and repaired as soon as possible.

5. How is the OBDII code P1004 related to NOx Sensor 2 Slow Response diagnosed in a Cadillac?

- Diagnosing this code typically involves using a scan tool to retrieve the specific code, checking the NOx sensor and related components for faults, and inspecting the wiring for any issues.

6. What are some repair tips for addressing the OBDII code P1004 in a Cadillac due to NOx Sensor 2 Slow Response?

- Repair tips may include replacing the faulty NOx sensor, repairing any wiring issues, fixing exhaust leaks, and resetting the engine control module after repairs are completed.

7. How much does it cost to repair the OBDII code P1004 related to NOx Sensor 2 Slow Response in a Cadillac?

- The cost of repairs can vary depending on the exact cause of the issue, but it may involve parts costs for a new NOx sensor, labor costs for diagnosis and repair, and potentially additional expenses for any related components that need attention.

8. Can a DIY enthusiast fix the OBDII code P1004 indicating NOx Sensor 2 Slow Response in a Cadillac?

- While some DIYers may have the skills to address this issue, it is recommended to consult a professional mechanic or technician for proper diagnosis and repair to ensure the problem is resolved correctly.

9. Will resetting the check engine light make the OBDII code P1004 related to NOx Sensor 2 Slow Response go away?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the code is not addressed, the light is likely to come back on as the problem persists.

10. Are there any recalls or technical service bulletins related to the OBDII code P1004 and NOx Sensor 2 Slow Response in Cadillac vehicles?

- It is advisable to check with a Cadillac dealership or the manufacturer's website to see if there are any recalls or technical service bulletins related to this specific OBDII code in your vehicle model.