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P1004 GMC Code - NOx Sensor 2 Slow Response

Quick Answer

The P1004 GMC diagnostic trouble code (DTC) refers to a NOx (nitrogen oxides) sensor 2 slow response, indicating a problem with the secondary NOx sensor in the vehicle's emissions control system. Common causes include Contaminated NOx sensor 2, Wiring harness issues, Exhaust leaks near the sensor. 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 GMC indicates NOx Sensor 2 Slow Response.
Common causes
Common causes include Contaminated NOx sensor 2, Wiring harness issues, Exhaust leaks near the sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1004 GMC Description

The P1004 GMC diagnostic trouble code (DTC) refers to a NOx (nitrogen oxides) sensor 2 slow response, indicating a problem with the secondary NOx sensor in the vehicle's emissions control system. NOx sensors are crucial for monitoring the levels of nitrogen oxides in the exhaust gases and ensuring compliance with emission standards. The slow response of NOx sensor 2 can lead to inaccurate readings, potentially causing the vehicle to emit higher levels of harmful pollutants into the environment.

OBDII Code P1004 GMC - NOx Sensor 2 Slow Response
P1004 GMC Code - NOx Sensor 2 Slow Response

Common Causes of P1004 GMC

  1. Contaminated NOx sensor 2
  2. Wiring harness issues
  3. Exhaust leaks near the sensor
  4. Faulty NOx sensor 2
  5. ECM software glitches

Symptoms of P1004 GMC

  1. Check engine light illuminated
  2. Decreased fuel efficiency
  3. Engine misfires or hesitation
  4. Failed emissions test
  5. Increased exhaust emissions

How to Fix P1004 GMC

  1. Diagnose the NOx sensor 2 using a scan tool to confirm the P1004 DTC.
  2. Inspect the sensor and surrounding components for any signs of contamination, damage, or leaks.
  3. Clean or replace the NOx sensor 2 as needed.
  4. Check and repair any wiring issues or exhaust leaks that may be affecting sensor performance.
  5. Clear the DTC and reset the ECM to monitor the sensor's response and ensure proper operation.

Cost to Fix P1004 GMC

The cost of repairing a NOx sensor 2 slow response issue can vary depending on the make and model of the vehicle, the location of the repair shop, and the extent of the problem. In general, replacing a NOx sensor 2 can cost between $200 and $500, including parts and labor. Additional costs may apply if wiring repairs or other components need attention. It is advisable to consult with a qualified mechanic or dealership for a more accurate estimate based on your specific vehicle and circumstances.

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Information for Specific GMC Models

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 GMC Code

1. What are the common symptoms of OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

The common symptoms of code P1004 include reduced engine performance, increased fuel consumption, and the illumination of the check engine light.

2. What can cause the OBDII code P1004 GMC to trigger (NOx Sensor 2 Slow Response)?

Possible causes of code P1004 include a faulty NOx sensor, wiring issues, exhaust leaks, or a malfunctioning catalytic converter.

3. How serious is the OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

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

4. How can I diagnose the OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

Diagnosing code P1004 typically involves using a scan tool to retrieve the code, inspecting the NOx sensor and its wiring, checking for exhaust leaks, and testing the catalytic converter.

5. Can I drive my vehicle with the OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

It is generally safe to drive the vehicle with this code, but it is recommended to address the underlying issue as soon as possible to prevent further complications.

6. What are some repair tips for fixing the OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

Repair tips for resolving code P1004 include checking and replacing the NOx sensor, repairing any damaged wiring, fixing exhaust leaks, and inspecting the catalytic converter for proper function.

7. How much does it cost to repair the OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

The cost of repairing code P1004 can vary depending on the underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix the OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

While some aspects of diagnosing and repairing code P1004 may be tackled by a DIY enthusiast with the right tools and knowledge, certain repairs may require professional expertise.

9. How long does it take to repair the OBDII code P1004 GMC (NOx Sensor 2 Slow Response)?

The repair time for code P1004 can vary based on the specific issue and the expertise of the technician, but it may take a few hours to a full day to complete the repairs.

10. Will resetting the OBDII code P1004 GMC (NOx Sensor 2 Slow Response) make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not fixed, the code is likely to reappear. It is crucial to address the root cause of the problem for a permanent solution.

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