AutoCodes – GMC – P2209 2016 GMC Sierra

P2209 2016 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 2016 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 212

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 2016 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 2016 GMC Sierra - NOx Sensor 1 Heater Control Circuit - AutoCodes.com — P2209 2016 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2209 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2209 in a 2016 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit?

Common symptoms include the Check Engine Light coming on, decreased fuel efficiency, rough idling, and potential failure to pass emissions tests.

2. What usually causes the OBDII code P2209 in a 2016 GMC Sierra NOx Sensor 1 Heater Control Circuit issue?

The most common causes of this code are a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or a problem with the sensor's heating element.

3. How can I diagnose the OBDII code P2209 in my 2016 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit?

Diagnosing this issue typically involves checking the sensor's wiring for damage, testing the heating element's resistance, and using a scan tool to monitor sensor data for irregularities.

4. Can I still drive my 2016 GMC Sierra with the OBDII code P2209 related to the NOx Sensor 1 Heater Control Circuit?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential damage to other components and ensure optimal vehicle performance.

5. How can I repair the OBDII code P2209 NOx Sensor 1 Heater Control Circuit problem in my 2016 GMC Sierra?

Repair options may include replacing the NOx sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, or addressing any issues with the sensor's heating element.

6. Is the OBDII code P2209 in a 2016 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit a serious issue?

While this code may not immediately affect the vehicle's drivability, it is crucial to address it promptly to maintain emissions compliance and prevent potential long-term damage to the vehicle's engine and emissions control system.

7. Can a DIY enthusiast fix the OBDII code P2209 NOx Sensor 1 Heater Control Circuit issue in a 2016 GMC Sierra?

Depending on their skill level and access to tools, a DIY enthusiast may be able to address this issue by following repair guides, but it is recommended to consult a professional mechanic for accurate diagnosis and repair.

8. How much does it typically cost to repair the OBDII code P2209 related to the NOx Sensor 1 Heater Control Circuit in a 2016 GMC Sierra?

The cost of repairing this issue can vary depending on the specific cause and labor rates in your area, but it may range from $200 to $500, including parts and labor.

9. Will resetting the Check Engine Light resolve the OBDII code P2209 NOx Sensor 1 Heater Control Circuit problem in my 2016 GMC Sierra?

Simply resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue. It is crucial to diagnose and repair the problem to prevent it from recurring.

10. How long does it typically take to repair the OBDII code P2209 NOx Sensor 1 Heater Control Circuit issue in a 2016 GMC Sierra?

The repair time can vary based on the specific cause and the availability of parts, but a skilled mechanic can usually address this problem within a few hours to a full day.