AutoCodes – GMC – P2203 2016 GMC Sierra

P2203 2016 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 2016 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 192

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 P2203 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 P2203 2016 GMC Sierra - NOx Sensor 1 Circuit High Voltage - AutoCodes.com — P2203 2016 GMC Sierra Code - NOx Sensor 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2203 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 P2203 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 P2203 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 P2203 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 P2203 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2203 (NOx Sensor 1 Circuit High Voltage)?

The common symptoms include the Check Engine Light turning on, reduced engine performance, failed emissions test, and potential fuel efficiency issues.

2. What are the possible causes of OBDII code P2203 in a 2016 GMC Sierra?

Potential causes of P2203 include a faulty NOx sensor, wiring issues in the sensor circuit, electrical problems, or a malfunctioning powertrain control module (PCM).

3. How serious is the P2203 error code in a 2016 GMC Sierra?

While the vehicle may still be drivable with this code, it is important to address it promptly to prevent potential damage to the engine or emissions system.

4. Can I continue driving my GMC Sierra with the P2203 code present?

It is generally not recommended to drive the vehicle extensively with this code active, as it may lead to decreased engine performance and potential long-term damage if left unresolved.

5. How can I diagnose the NOx Sensor 1 Circuit High Voltage issue in my 2016 GMC Sierra?

Diagnosing this issue typically involves using an OBDII scanner to read the code, checking the sensor's wiring and connections, and testing the sensor's functionality.

6. Is it possible to reset the P2203 code in a GMC Sierra without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is crucial to address the root cause of the problem, as simply resetting the code will not resolve the underlying issue causing the high voltage.

7. Can a DIY enthusiast repair the P2203 NOx Sensor 1 Circuit High Voltage code in a GMC Sierra?

Depending on your skill level and access to tools, you may be able to address this code yourself by checking the sensor, wiring, and connections. However, seeking professional help is recommended for complex electrical issues.

8. How much does it typically cost to repair the P2203 code related to the NOx sensor in a 2016 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue. It may range from a few hundred dollars for sensor replacement to more significant costs if wiring or PCM issues are involved.

9. Are there any preventive measures to avoid the recurrence of the P2203 code in a GMC Sierra?

Regular maintenance, such as checking the NOx sensor and its connections during routine service intervals, can help prevent the reoccurrence of the P2203 code.

10. Will the P2203 code in a 2016 GMC Sierra affect the vehicle's emissions compliance?

Yes, the presence of the P2203 code indicates a potential issue with the NOx sensor, which is crucial for emissions control. It is advisable to address this code promptly to ensure compliance with emissions regulations.