AutoCodes – GMC – P2202 2015 GMC Sierra

P2202 2015 GMC Sierra Code - NOx Sensor 1 Circuit Low 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 Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P2202 2015 GMC Sierra indicates NOx Sensor 1 Circuit Low 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: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 221

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 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 P2202 2015 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 P2202 2015 GMC Sierra - NOx Sensor 1 Circuit Low Voltage - AutoCodes.com — P2202 2015 GMC Sierra Code - NOx Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2202 2015 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 P2202 2015 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 P2202 2015 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 P2202 2015 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 P2202 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2202 in a 2015 GMC Sierra related to the NOx Sensor 1 Circuit Low Voltage?

The common symptoms include reduced engine performance, increased fuel consumption, and the illumination of the check engine light.

2. What are the possible causes of the NOx Sensor 1 Circuit Low Voltage code (P2202) in a 2015 GMC Sierra?

Potential causes may include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning NOx sensor module, or issues with the vehicle's powertrain control module (PCM).

3. How can I diagnose the NOx Sensor 1 Circuit Low Voltage issue (P2202) in my 2015 GMC Sierra?

Diagnosis typically involves using an OBDII scanner to retrieve the trouble code, inspecting the NOx sensor and related wiring for damage, and testing the sensor's voltage output using a multimeter.

4. Can I continue driving my 2015 GMC Sierra with the P2202 code related to the NOx Sensor 1 Circuit Low Voltage?

It is not recommended to drive the vehicle with this code present, as it can lead to potential emissions issues and affect overall engine performance. It's best to address the problem promptly.

5. How can I repair the NOx Sensor 1 Circuit Low Voltage issue (P2202) in my 2015 GMC Sierra?

Repair options may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, resetting the PCM, or seeking professional assistance for further diagnosis and repair.

6. Are there any DIY tips for fixing the P2202 code related to the NOx Sensor 1 Circuit Low Voltage in a 2015 GMC Sierra?

While some basic checks and visual inspections can be done by DIY enthusiasts, resolving the underlying issue may require specialized tools and expertise. It's advisable to consult a professional mechanic for proper diagnosis and repair.

7. How much does it cost to repair the NOx Sensor 1 Circuit Low Voltage problem (P2202) in a 2015 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue, the parts needed, and labor charges. It's recommended to obtain quotes from different repair shops for an accurate estimate.

8. Can a bad NOx sensor cause other problems in a 2015 GMC Sierra besides triggering the P2202 code?

Yes, a malfunctioning NOx sensor can lead to increased emissions, poor fuel efficiency, and potential damage to other engine components if left unresolved. It's essential to address the issue promptly.

9. How long does it typically take to repair the NOx Sensor 1 Circuit Low Voltage issue (P2202) in a 2015 GMC Sierra?

The repair time can vary depending on the exact cause of the problem and the complexity of the repair. In some cases, it may be a relatively quick fix, while in others, it could take longer for thorough diagnosis and repair.

10. Can resetting the check engine light resolve the P2202 code related to the NOx Sensor 1 Circuit Low Voltage in a 2015 GMC Sierra?

Simply resetting the check engine light may temporarily clear the code, but it won't fix the underlying issue causing the fault code. It's crucial to diagnose and repair the problem to prevent it from reoccurring.