AutoCodes – GMC – P2205 2018 GMC Sierra

P2205 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: P2205 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 224

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 P2205 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 P2205 2018 GMC Sierra - NOx Sensor 1 Heater Control Circuit - AutoCodes.com — P2205 2018 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2205 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 P2205 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 P2205 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 P2205 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 P2205 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2205 in a 2018 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit?

The common symptoms include the Check Engine Light (CEL) illuminating on the dashboard, reduced engine performance, and potential failure to pass emissions tests.

2. What are the possible causes of OBDII code P2205 in a 2018 GMC Sierra?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or issues with the engine control module (ECM).

3. How can I diagnose the NOx Sensor 1 Heater Control Circuit issue triggering OBDII code P2205 in my 2018 GMC Sierra?

Diagnosis involves using an OBDII scanner to retrieve the trouble code, inspecting the NOx sensor and related wiring for damage, checking the fuse, and testing the sensor's resistance and heater circuit.

4. Can I continue driving my 2018 GMC Sierra with OBDII code P2205 related to the NOx Sensor 1 Heater Control Circuit?

While the vehicle may still be operable, prolonged driving with this issue can lead to reduced fuel efficiency and potential damage to the catalytic converter. It is recommended to address the problem promptly.

5. How can I repair OBDII code P2205 in my 2018 GMC Sierra caused by the NOx Sensor 1 Heater Control Circuit?

Repair options include replacing the faulty NOx sensor, repairing damaged wiring or connectors, checking and replacing the fuse if necessary, and resetting the ECM after completing the repairs.

6. Are there any DIY tips for fixing OBDII code P2205 in a 2018 GMC Sierra associated with the NOx Sensor 1 Heater Control Circuit?

While some basic troubleshooting like checking fuses and visually inspecting wiring can be done by DIY enthusiasts, replacing the NOx sensor or addressing complex wiring issues may require professional assistance.

7. How much does it typically cost to repair OBDII code P2205 in a 2018 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit?

The repair costs can vary depending on the exact cause of the issue, but budgeting for sensor replacement, wiring repairs, and labor could range from $200 to $500 or more at a dealership or repair shop.

8. Will resetting the OBDII code P2205 related to the NOx Sensor 1 Heater Control Circuit in my 2018 GMC Sierra make the issue go away permanently?

Resetting the code without addressing the underlying problem will only temporarily clear the CEL. The issue causing the code will persist and likely trigger the code again until properly repaired.

9. Can extreme weather conditions or environmental factors trigger OBDII code P2205 in a 2018 GMC Sierra due to the NOx Sensor 1 Heater Control Circuit?

Extreme cold or heat can potentially affect the operation of the NOx sensor's heater circuit, leading to the triggering of this code. However, the root cause is often related to sensor or circuit failure rather than just environmental conditions.

10. Is it necessary to visit a GMC dealership for diagnosing and repairing OBDII code P2205 in a 2018 GMC Sierra related to the NOx Sensor 1 Heater Control Circuit?

While a dealership may have specialized knowledge and equipment, independent auto repair shops with experience in GMC vehicles can also effectively diagnose and repair this issue, potentially offering more cost-effective solutions.