AutoCodes – GMC – P2209 2018 GMC Sierra

P2209 2018 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 2018 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 204

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 P2209 2018 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 2018 GMC Sierra - NOx Sensor 1 Heater Control Circuit - AutoCodes.com — P2209 2018 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2209 2018 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 2018 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 2018 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 2018 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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2209 (NOx Sensor 1 Heater Control Circuit) in a 2018 GMC Sierra?

The common symptoms of P2209 may include the Check Engine light turning on, reduced engine performance, increased fuel consumption, and possible emissions issues.

2. What are the possible causes of the NOx Sensor 1 Heater Control Circuit fault code in a 2018 GMC Sierra?

The P2209 code in a 2018 GMC Sierra can be triggered by issues such as a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning NOx sensor heater.

3. How serious is the OBDII code P2209 (NOx Sensor 1 Heater Control Circuit) in a 2018 GMC Sierra?

While P2209 is not typically an urgent issue, it should be addressed promptly to avoid potential damage to the emissions control system and to ensure optimal engine performance.

4. Can driving with the P2209 fault code in a 2018 GMC Sierra cause further damage?

Continued driving with the P2209 code may lead to increased emissions, reduced fuel efficiency, and potential harm to the catalytic converter and other emission control components.

5. How can I diagnose and repair the NOx Sensor 1 Heater Control Circuit issue in my 2018 GMC Sierra?

Diagnosing and repairing P2209 may involve checking the NOx sensor and its wiring for damage, testing the sensor heater circuit, ensuring proper power supply, and replacing any faulty components.

6. Is it possible to reset the P2209 trouble code in a 2018 GMC Sierra?

While clearing the fault code can be done using an OBDII scanner, it is essential to address the underlying issue causing the P2209 code before resetting it to prevent recurrence.

7. How much does it typically cost to repair the NOx Sensor 1 Heater Control Circuit fault in a 2018 GMC Sierra?

The cost of repairing P2209 can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can I drive my 2018 GMC Sierra with the Check Engine light on due to the P2209 code?

It is generally not recommended to drive with the Check Engine light on, as it indicates a potential issue that requires attention. It is advisable to address the problem promptly.

9. Are there any recalls or technical service bulletins related to the P2209 code in a 2018 GMC Sierra?

Owners of a 2018 GMC Sierra experiencing the P2209 code should check for any relevant recalls or technical service bulletins issued by the manufacturer, as they may provide guidance on addressing the issue.

10. How can I prevent the NOx Sensor 1 Heater Control Circuit fault in my 2018 GMC Sierra?

Regular maintenance, such as keeping up with scheduled services, addressing any warning lights promptly, and avoiding harsh driving conditions, can help prevent issues like the P2209 code from occurring.