AutoCodes – GMC – P2203 2017 GMC Sierra

P2203 2017 GMC Sierra Code - NOx Sensor 1 Circuit High Voltage

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: P2203 2017 GMC Sierra indicates NOx Sensor 1 Circuit High Voltage.
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 160

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 P2203 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 P2203 2017 GMC Sierra - NOx Sensor 1 Circuit High Voltage - AutoCodes.com — P2203 2017 GMC Sierra Code - NOx Sensor 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2203 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 P2203 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 P2203 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 P2203 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 P2203 2017 GMC Sierra Code

1. What does OBDII code P2203 mean for a 2017 GMC Sierra?

- OBDII code P2203 on a 2017 GMC Sierra indicates a problem with the NOx Sensor 1 Circuit High Voltage.

2. What are the common symptoms of OBDII code P2203 in a 2017 GMC Sierra?

- Common symptoms of OBDII code P2203 in a 2017 GMC Sierra may include reduced engine performance, increased fuel consumption, and the illumination of the check engine light.

3. What are the possible causes of OBDII code P2203 in a 2017 GMC Sierra?

- Possible causes of OBDII code P2203 in a 2017 GMC Sierra include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

4. How can I diagnose OBDII code P2203 in a 2017 GMC Sierra?

- Diagnosing OBDII code P2203 in a 2017 GMC Sierra involves using an OBDII scanner to retrieve the code, inspecting the NOx sensor and its connections, and testing the sensor's voltage output.

5. Can I continue driving my 2017 GMC Sierra with OBDII code P2203?

- It is not recommended to continue driving a 2017 GMC Sierra with OBDII code P2203, as the issue can affect engine performance and emissions control. It's best to address the problem promptly.

6. How can I repair OBDII code P2203 in a 2017 GMC Sierra?

- Repairing OBDII code P2203 in a 2017 GMC Sierra may involve replacing the faulty NOx sensor, repairing damaged wiring or connectors, or reprogramming the engine control module.

7. Is it possible to reset OBDII code P2203 in a 2017 GMC Sierra without repairing the issue?

- Resetting OBDII code P2203 in a 2017 GMC Sierra without addressing the underlying problem will only temporarily clear the code. The check engine light is likely to reappear until the issue is resolved.

8. Are there any preventive measures to avoid OBDII code P2203 in a 2017 GMC Sierra?

- Regular maintenance, such as checking and replacing sensors as recommended by the manufacturer, can help prevent OBDII code P2203 in a 2017 GMC Sierra. Keeping up with scheduled servicing is key.

9. Can a DIY enthusiast fix OBDII code P2203 in a 2017 GMC Sierra?

- While some may attempt to fix OBDII code P2203 in a 2017 GMC Sierra themselves, it's recommended to have the issue diagnosed and repaired by a qualified mechanic to ensure proper resolution.

10. How much can I expect to pay for repairing OBDII code P2203 in a 2017 GMC Sierra?

- The cost of repairing OBDII code P2203 in a 2017 GMC Sierra can vary based on the root cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.