AutoCodes – Chevrolet – P30B5 2018 Chevrolet Silverado

P30B5 2018 Chevrolet Silverado Code - NOx Sensor 2 Signal Message Counter Incorrect

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty NOx Sensor 2, NOx Sensor 2 harness is open or shorted, NOx Sensor 2 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: P30B5 2018 Chevrolet Silverado indicates NOx Sensor 2 Signal Message Counter Incorrect.
Common causes: Common causes include Faulty NOx Sensor 2, NOx Sensor 2 harness is open or shorted, NOx Sensor 2 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 279

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P30B5 2018 Chevrolet Silverado Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the NOx Sensor 2 Signal Message Counter is Incorrect.

OBDII Code P30B5 2018 Chevrolet Silverado - NOx Sensor 2 Signal Message Counter Incorrect - AutoCodes.com — P30B5 2018 Chevrolet Silverado Code - NOx Sensor 2 Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P30B5 2018 Chevrolet Silverado?

Faulty NOx Sensor 2
NOx Sensor 2 harness is open or shorted
NOx Sensor 2 circuit poor electrical connection

How to Fix the DTC P30B5 2018 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 P30B5 2018 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 P30B5 2018 Chevrolet Silverado code?

Need more information on how to fix the P30B5 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P30B5 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P30B5 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P30B5 on a 2018 Chevrolet Silverado?

The common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P30B5 indicate on a 2018 Chevrolet Silverado?

The code P30B5 indicates that the NOx Sensor 2 Signal Message Counter is reporting an incorrect value.

3. What are the possible causes of OBDII code P30B5 on a 2018 Chevrolet Silverado?

Possible causes include a faulty NOx sensor, wiring issues, a software glitch, or a problem with the engine control module.

4. How can I diagnose the OBDII code P30B5 on my 2018 Chevrolet Silverado?

Diagnosing this code typically involves using a diagnostic scanner to read the code, checking the wiring and connections to the NOx sensor, and testing the sensor itself.

5. Can I continue driving my 2018 Chevrolet Silverado with the OBDII code P30B5?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potentially affect the vehicle's emissions.

6. How can I repair OBDII code P30B5 on a 2018 Chevrolet Silverado?

Repairing this code may involve replacing the NOx sensor, repairing any damaged wiring, updating the engine control module software, or resetting the fault code after fixing any underlying issues.

7. Will resetting the OBDII code P30B5 on my 2018 Chevrolet Silverado solve the problem?

Simply resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the fault code to appear.

8. Can a DIY enthusiast fix the OBDII code P30B5 on a 2018 Chevrolet Silverado?

While some basic troubleshooting like checking connections and wiring can be done by a DIY enthusiast, diagnosing and repairing the root cause of the code may require professional expertise and specialized tools.

9. How much does it typically cost to repair OBDII code P30B5 on a 2018 Chevrolet Silverado?

The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Is the OBDII code P30B5 a common issue on 2018 Chevrolet Silverado vehicles?

While the prevalence of this specific code may vary, NOx sensor-related issues are not uncommon in modern vehicles with emissions control systems like the 2018 Chevrolet Silverado.