AutoCodes – GMC – P2202 2018 GMC Sierra

P2202 2018 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 2018 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 172

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 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 P2202 2018 GMC Sierra - NOx Sensor 1 Circuit Low Voltage - AutoCodes.com — P2202 2018 GMC Sierra Code - NOx Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2202 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 P2202 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 P2202 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 P2202 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 P2202 2018 GMC Sierra Code

What does the OBDII code P2202 mean on a 2018 GMC Sierra?

Code P2202 indicates that the NOx Sensor 1 (Nitrogen Oxide Sensor) is experiencing low voltage in its circuit, which suggests an issue with the sensor or its wiring.

What symptoms might occur with code P2202 on a 2018 GMC Sierra?

Common symptoms include reduced engine performance, increased fuel consumption, and the check engine light illuminating.

What causes the P2202 code on a 2018 GMC Sierra?

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

Can driving with code P2202 damage my 2018 GMC Sierra?

Driving with this code may increase emissions and reduce fuel efficiency, but immediate damage is unlikely. However, prolonged driving without addressing the issue can lead to more severe problems.

How do I diagnose the P2202 code on a 2018 GMC Sierra?

Diagnosis involves inspecting the NOx sensor, checking for damaged wires or connectors, and using a scan tool to monitor sensor voltage readings.

How do I fix the P2202 code on a 2018 GMC Sierra?

Common fixes include replacing the NOx sensor, repairing or replacing damaged wiring, or updating the ECM software if needed.

How much does it cost to repair code P2202 on a 2018 GMC Sierra?

Repair costs vary but typically range from $300 to $600 for a NOx sensor replacement, depending on labor and parts pricing.

Can I clear the P2202 code without fixing the issue?

You can clear the code temporarily, but it will likely return until the underlying problem is resolved.

Is the NOx sensor covered under warranty for a 2018 GMC Sierra?

Depending on your vehicle's warranty and mileage, emissions-related components like the NOx sensor may still be covered. Check with your dealership.

Can a dirty DEF system cause code P2202 on a 2018 GMC Sierra?

Yes, contamination or improper DEF fluid can affect the NOx sensor's readings and lead to this code. Ensure the DEF system is clean and the fluid meets specifications.