AutoCodes – GMC – P2208 2014 GMC Sierra

P2208 2014 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 2014 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 221

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 P2208 2014 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 2014 GMC Sierra - NOx Sensor 1 Heater Feedback Circuit - AutoCodes.com — P2208 2014 GMC Sierra Code - NOx Sensor 1 Heater Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P2208 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P2208 in a 2014 GMC Sierra related to the NOx Sensor 1 Heater Feedback Circuit?

The common symptoms include the check engine light illuminating, decreased fuel efficiency, and potential issues passing emissions tests.

2. What are the possible causes of OBDII code P2208 indicating a problem with the NOx Sensor 1 Heater Feedback Circuit in a 2014 GMC Sierra?

Possible causes of this code include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning heater element, or issues with the vehicle's computer system.

3. How can I diagnose the OBDII code P2208 in my 2014 GMC Sierra related to the NOx Sensor 1 Heater Feedback Circuit?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the NOx sensor and its connections for damage, and testing the heater element for proper functioning.

4. Are there any DIY repair tips for addressing OBDII code P2208 in a 2014 GMC Sierra associated with the NOx Sensor 1 Heater Feedback Circuit?

DIY repair tips may include checking and repairing any damaged wiring or connectors, replacing the NOx sensor if necessary, and ensuring the heater element is receiving power and functioning correctly.

5. Can I continue driving my 2014 GMC Sierra with the OBDII code P2208 related to the NOx Sensor 1 Heater Feedback Circuit illuminated?

It is generally not recommended to continue driving with this code, as it can lead to increased emissions, decreased fuel efficiency, and potential long-term damage to the vehicle's emission control system.

6. How much does it typically cost to repair OBDII code P2208 in a 2014 GMC Sierra linked to the NOx Sensor 1 Heater Feedback Circuit?

The cost of repair 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.

7. Is OBDII code P2208 in a 2014 GMC Sierra associated with the NOx Sensor 1 Heater Feedback Circuit a common issue?

While not as common as some other OBDII codes, issues related to the NOx sensor and its heater circuit can occur in vehicles equipped with this system, including the 2014 GMC Sierra.

8. Will resetting the check engine light clear OBDII code P2208 in a 2014 GMC Sierra related to the NOx Sensor 1 Heater Feedback Circuit?

Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on after some driving cycles.

9. Can a malfunctioning NOx sensor cause other problems in a 2014 GMC Sierra besides triggering OBDII code P2208 related to the NOx Sensor 1 Heater Feedback Circuit?

Yes, a malfunctioning NOx sensor can lead to decreased performance, increased emissions, and potential damage to other components in the emission control system of the vehicle.

10. How can I prevent OBDII code P2208 from recurring in my 2014 GMC Sierra due to issues with the NOx Sensor 1 Heater Feedback Circuit?

Regular maintenance, including checking the NOx sensor and its connections, addressing any wiring issues promptly, and ensuring proper operation of the heater element, can help prevent the recurrence of this code.