AutoCodes – GMC – P2209 2015 GMC Sierra

P2209 2015 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit

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: P2209 2015 GMC Sierra indicates NOx Sensor 1 Heater Control Circuit.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 227

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2209 2015 GMC Sierra 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 P2209 2015 GMC Sierra - NOx Sensor 1 Heater Control Circuit - AutoCodes.com — P2209 2015 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2209 2015 GMC Sierra?

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 P2209 2015 GMC Sierra?

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 P2209 2015 GMC Sierra 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.

Need more information about the P2209 2015 GMC Sierra code?

Need more information on how to fix the P2209 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2209 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P2209 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2209 in a 2015 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit?

The common symptoms include the check engine light illuminating, decreased fuel efficiency, and potential performance issues.

2. What are the possible causes of the P2209 code on a 2015 GMC Sierra?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a faulty PCM (Powertrain Control Module).

3. How can I diagnose the NOx Sensor 1 Heater Control Circuit issue in my 2015 GMC Sierra?

Diagnosis typically involves checking the NOx sensor heater circuit for continuity, inspecting the wiring for damage, and testing the sensor's resistance. A professional diagnostic scan tool may be necessary for accurate diagnosis.

4. Can I continue driving my 2015 GMC Sierra with the P2209 code present?

It is not recommended to ignore the P2209 code, as it can lead to increased emissions and potential damage to the vehicle's emissions control system. It is advisable to address the issue promptly.

5. Is it possible to repair the NOx Sensor 1 Heater Control Circuit issue in my 2015 GMC Sierra myself?

While some DIY enthusiasts may have the skill and tools to address the issue, it is recommended to consult a qualified mechanic or dealership for proper diagnosis and repair of the NOx sensor heater circuit.

6. How much does it typically cost to repair the NOx Sensor 1 Heater Control Circuit on a 2015 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue. It may range from a few hundred to a few thousand dollars, including parts and labor.

7. Can a faulty NOx sensor cause other problems in my 2015 GMC Sierra?

Yes, a faulty NOx sensor can impact the vehicle's emissions control system, potentially leading to increased emissions, decreased fuel efficiency, and performance issues.

8. Are there any maintenance tips to prevent the NOx Sensor 1 Heater Control Circuit issue in my 2015 GMC Sierra?

Regular maintenance, such as checking the vehicle's wiring and connectors for damage, can help prevent issues with the NOx sensor heater circuit. Additionally, following the manufacturer's recommended service schedule is crucial.

9. Will resetting the OBDII code P2209 in my 2015 GMC Sierra make the issue go away?

Resetting the code may temporarily turn off the check engine light, but it will not address the underlying problem causing the P2209 code. It is essential to diagnose and repair the issue to prevent further issues.

10. How long does it take to repair the NOx Sensor 1 Heater Control Circuit problem in a 2015 GMC Sierra?

The repair time can vary depending on the specific cause of the issue and the availability of parts. It may take a few hours to a full day to diagnose and repair the NOx sensor heater circuit problem in your GMC Sierra.