AutoCodes – GMC – P2208 2017 GMC Sierra

P2208 2017 GMC Sierra Code - NOx Sensor 1 Heater Feedback 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: P2208 2017 GMC Sierra indicates NOx Sensor 1 Heater Feedback 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 199

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 P2208 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 P2208 2017 GMC Sierra - NOx Sensor 1 Heater Feedback Circuit - AutoCodes.com — P2208 2017 GMC Sierra Code - NOx Sensor 1 Heater Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P2208 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 P2208 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 P2208 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 P2208 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 P2208 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P2208 in a 2017 GMC Sierra related to the NOx Sensor 1 Heater Feedback Circuit?

- Common symptoms include the check engine light illuminating, decreased fuel efficiency, and potential issues with the vehicle's emission system.

2. What are the possible causes of OBDII code P2208 in a 2017 GMC Sierra?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the heater circuit, issues with the sensor's power supply, or a malfunction in the engine control module.

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

- Diagnosing the problem involves using an OBDII scanner to retrieve the specific error code, checking the wiring and connectors for damage or corrosion, and testing the NOx sensor's functionality.

4. Can I continue driving my 2017 GMC Sierra with OBDII code P2208 related to the NOx Sensor 1 Heater Feedback Circuit?

- It is not recommended to drive the vehicle extensively with this code present, as it can lead to potential issues with emissions and engine performance.

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

- Repair options may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, resetting the engine control module, or seeking assistance from a professional mechanic.

6. Is it possible to reset the OBDII code P2208 in a 2017 GMC Sierra without fixing the underlying issue?

- While you can clear the error code using an OBDII scanner, it is essential to address the root cause of the problem to prevent it from reoccurring.

7. Are there any recalls or technical service bulletins related to OBDII code P2208 in the 2017 GMC Sierra?

- It's recommended to check with a GMC dealership or visit the National Highway Traffic Safety Administration (NHTSA) website for any relevant recalls or technical service bulletins related to this issue.

8. Can extreme weather conditions affect the NOx Sensor 1 Heater Feedback Circuit in a 2017 GMC Sierra?

- Extreme temperatures or harsh weather conditions can potentially impact the sensor's performance, so it's essential to keep the vehicle well-maintained and protected.

9. How long does it typically take to repair the NOx Sensor 1 Heater Feedback Circuit issue in a 2017 GMC Sierra?

- The repair time can vary depending on the extent of the problem and the availability of parts, but it's advisable to consult with a professional mechanic for an accurate estimate.

10. What are the potential consequences of ignoring OBDII code P2208 related to the NOx Sensor 1 Heater Feedback Circuit in a 2017 GMC Sierra?

- Ignoring this code can lead to increased emissions, decreased fuel efficiency, and potential damage to other components of the vehicle's emission system. It's best to address the issue promptly to avoid further complications.