AutoCodes – GMC – P2209 2017 GMC Sierra

P2209 2017 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 2017 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.

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Code Popularity 176

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 P2209 2017 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 2017 GMC Sierra - NOx Sensor 1 Heater Control Circuit - AutoCodes.com — P2209 2017 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2209 2017 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 2017 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 2017 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 2017 GMC Sierra code?

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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 P2209 2017 GMC Sierra Code

1. What are common symptoms of OBDII code P2209 in a 2017 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit?

The common symptoms include illuminated Check Engine Light, reduced engine performance, and potential failure to pass emissions tests.

2. What are the possible causes of OBDII code P2209 in a 2017 GMC Sierra?

Some possible causes include a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or issues with the NOx sensor heater circuit.

3. How can I diagnose the NOx Sensor 1 Heater Control Circuit issue in my 2017 GMC Sierra?

You can diagnose the problem by using a diagnostic scanner to read the OBDII code, inspecting the wiring and connectors for damage, testing the NOx sensor resistance, and checking the fuse related to the sensor.

4. Can I continue driving my 2017 GMC Sierra with OBDII code P2209 present?

It is not recommended to continue driving with the code present as it can lead to reduced fuel efficiency, increased emissions, and potential damage to other engine components.

5. How can I repair the NOx Sensor 1 Heater Control Circuit issue in my 2017 GMC Sierra?

To repair the issue, you may need to replace the faulty NOx sensor, repair or replace damaged wiring and connectors, check and replace any blown fuses, and clear the OBDII code with a diagnostic scanner.

6. Will resetting the OBDII code P2209 in my 2017 GMC Sierra fix the problem?

Resetting the code may temporarily turn off the Check Engine Light, but it will not fix the underlying issue causing the NOx Sensor 1 Heater Control Circuit problem.

7. Is it possible to prevent OBDII code P2209 from occurring in my 2017 GMC Sierra?

Regular maintenance, such as checking and replacing worn-out sensors, inspecting wiring for damage, and addressing any engine performance issues promptly, can help prevent the occurrence of this code.

8. Can a DIY enthusiast fix the NOx Sensor 1 Heater Control Circuit issue in a 2017 GMC Sierra?

While some individuals with automotive repair experience may be able to address this issue themselves, it is recommended to consult a professional mechanic for proper diagnosis and repair.

9. How much does it typically cost to repair OBDII code P2209 related to the NOx Sensor 1 Heater Control Circuit in a 2017 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue, but it may range from $200 to $600, including parts and labor.

10. Are there any recalls or technical service bulletins related to OBDII code P2209 in a 2017 GMC Sierra?

It is advisable to check with a GMC 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.