AutoCodes – Chevrolet – P2202 2014 Chevrolet Silverado

P2202 2014 Chevrolet Silverado 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 Chevrolet Silverado 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 465

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 Chevrolet Silverado 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 Chevrolet Silverado - NOx Sensor 1 Circuit Low Voltage - AutoCodes.com — P2202 2014 Chevrolet Silverado Code - NOx Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2202 2014 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

Need more information on how to fix the P2202 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 Chevrolet Silverado Code

1. What does the OBDII code P2202 mean on a 2014 Chevrolet Silverado?

P2202 indicates that the NOx Sensor 1 (Nitrogen Oxide Sensor) is reporting a low voltage issue, which could affect the vehicle's emissions system.

2. What are the common symptoms of a P2202 code?

Symptoms may include reduced fuel efficiency, illuminated check engine light, increased emissions, and possibly a reduction in engine performance.

3. What causes the P2202 code on a 2014 Chevrolet Silverado?

Common causes include a faulty NOx sensor, damaged wiring or connectors, exhaust system leaks, or software issues in the engine control module (ECM).

4. Can I drive my Silverado with a P2202 code?

While the truck may still be drivable, it is not recommended as the issue could lead to increased emissions and potential damage to the emissions system over time.

5. How do I diagnose the P2202 code?

Start by inspecting the NOx sensor and its wiring for damage or corrosion, then use a scan tool to monitor live data from the sensor and confirm if itâ€™s functioning correctly.

6. How do I fix a P2202 code?

Repairs may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, addressing any exhaust leaks, or updating the ECM software.

7. How much does it cost to fix a P2202 code?

Repair costs can vary, but replacing a NOx sensor typically ranges from $200 to $600, including parts and labor, depending on local rates.

8. Can a faulty NOx sensor damage the engine?

While it may not directly damage the engine, a malfunctioning NOx sensor can cause poor fuel efficiency and increased emissions, potentially harming other components over time.

9. Does the P2202 code mean my Silverado will fail an emissions test?

Yes, a P2202 code can cause your truck to fail an emissions test due to the impact on the emissions control system.

10. How can I prevent the P2202 code from recurring?

Regular maintenance, inspecting the exhaust system for leaks, and ensuring the NOx sensor is clean and functioning properly can help prevent this code from reappearing.