AutoCodes – GMC – P2202 2014 GMC Sierra

P2202 2014 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 2014 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 265

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 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 P2202 2014 GMC Sierra - NOx Sensor 1 Circuit Low Voltage - AutoCodes.com — P2202 2014 GMC Sierra Code - NOx Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2202 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 P2202 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 P2202 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 P2202 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 P2202 2014 GMC Sierra Code

1. What are common symptoms of an OBDII code P2202 in a 2014 GMC Sierra related to the NOx Sensor 1 Circuit Low Voltage?

The common symptoms include the Check Engine light illuminating, reduced engine performance, and potential failed emissions testing.

2. What are the possible causes of the OBDII code P2202 indicating NOx Sensor 1 Circuit Low Voltage in a 2014 GMC Sierra?

Potential causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, software issues, or problems with the vehicle's ECM.

3. How can I diagnose the OBDII code P2202 on my 2014 GMC Sierra related to the NOx Sensor 1 Circuit Low Voltage?

Diagnosing this code typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the NOx sensor and its connections, and checking for any visible signs of damage.

4. Is it safe to continue driving my 2014 GMC Sierra with the OBDII code P2202 for NOx Sensor 1 Circuit Low Voltage?

It is generally not recommended to drive the vehicle with this fault code present, as it may lead to reduced performance, increased emissions, and potential damage to other engine components.

5. Can I reset the OBDII code P2202 related to the NOx Sensor 1 Circuit Low Voltage in my 2014 GMC Sierra?

While you can clear the code using an OBDII scanner, it is important to diagnose and address the underlying issue causing the fault code to prevent it from reoccurring.

6. How much does it typically cost to repair the OBDII code P2202 for NOx Sensor 1 Circuit Low Voltage in a 2014 GMC Sierra?

The cost of repair can vary depending on the specific cause of the issue, but it may involve replacing the NOx sensor, repairing damaged wiring, or addressing ECM software issues.

7. Are there any DIY tips for addressing the OBDII code P2202 related to the NOx Sensor 1 Circuit Low Voltage in a 2014 GMC Sierra?

While some basic inspections and checks can be done by DIY enthusiasts, diagnosing and repairing this code often requires specialized tools and expertise, so it is advisable to consult a professional mechanic.

8. How does the NOx sensor work in a 2014 GMC Sierra, and why is it important for emissions control?

The NOx sensor measures the levels of nitrogen oxide in the exhaust gases and helps the vehicle's ECM optimize the air-fuel mixture for efficient combustion and reduced emissions, contributing to cleaner air quality.

9. Can extreme weather conditions or driving habits contribute to triggering the OBDII code P2202 for NOx Sensor 1 Circuit Low Voltage in a 2014 GMC Sierra?

Yes, extreme temperatures, prolonged idling, or aggressive driving can potentially affect the performance of the NOx sensor and contribute to triggering this fault code.

10. How often should the NOx sensor be inspected or replaced in a 2014 GMC Sierra to prevent the occurrence of the OBDII code P2202 for NOx Sensor 1 Circuit Low Voltage?

It is recommended to follow the manufacturer's maintenance schedule for regular inspections of the NOx sensor and its components to ensure proper functioning and prevent issues like the P2202 fault code from occurring.