AutoCodes – GMC – P2208 2016 GMC Sierra

P2208 2016 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 2016 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 214

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 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 P2208 2016 GMC Sierra - NOx Sensor 1 Heater Feedback Circuit - AutoCodes.com — P2208 2016 GMC Sierra Code - NOx Sensor 1 Heater Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P2208 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 P2208 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 P2208 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 P2208 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 P2208 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2208 in a 2016 GMC Sierra related to NOx Sensor 1 Heater Feedback Circuit?

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

2. What are the possible causes of OBDII code P2208 in a 2016 GMC Sierra?

Possible causes include a malfunctioning NOx sensor, issues with the heater circuit, wiring or connector problems, or a faulty powertrain control module (PCM).

3. How can I diagnose the NOx Sensor 1 Heater Feedback Circuit issue in my 2016 GMC Sierra?

Diagnosing the problem involves using an OBDII scanner to retrieve the specific trouble code, checking the sensor for proper operation, inspecting the wiring and connectors for damage, and testing the heater circuit.

4. Can I continue driving my 2016 GMC Sierra with the P2208 code related to the NOx Sensor 1 Heater Feedback Circuit?

It is not recommended to drive the vehicle with this code present, as it may lead to increased emissions, reduced fuel efficiency, and potential engine damage over time.

5. How can I repair the NOx Sensor 1 Heater Feedback Circuit issue in my 2016 GMC Sierra?

Repairing the issue may involve replacing the NOx sensor, repairing or replacing damaged wiring or connectors, or reprogramming the PCM. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any DIY tips for troubleshooting OBDII code P2208 in a 2016 GMC Sierra?

DIY tips include checking and cleaning the sensor connectors, inspecting the wiring for visible damage, and ensuring proper power supply to the sensor and heater circuit.

7. Can a faulty NOx Sensor 1 cause other issues in a 2016 GMC Sierra besides triggering code P2208?

Yes, a faulty NOx sensor can potentially cause poor engine performance, increased emissions, and may lead to other related trouble codes being triggered in the vehicle.

8. How much does it cost to repair the NOx Sensor 1 Heater Feedback Circuit issue in a 2016 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue, parts needed, and labor costs. It is advisable to get multiple quotes from different mechanics or dealerships.

9. Is it possible to reset the Check Engine light after fixing the NOx Sensor 1 Heater Feedback Circuit issue in a 2016 GMC Sierra?

Yes, the Check Engine light can be reset using an OBDII scanner after the underlying issue has been properly diagnosed and repaired.

10. How often should the NOx sensor be replaced in a 2016 GMC Sierra to prevent recurring P2208 codes?

The NOx sensor does not have a specific replacement interval, but it is recommended to follow the manufacturer's maintenance schedule and replace the sensor if it fails or shows signs of malfunction.