AutoCodes – GMC – P30D5 2014 GMC Sierra

P30D5 2014 GMC Sierra Code - NOx Sensor 3 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 3, NOx Sensor 3 harness is open or shorted, NOx Sensor 3 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: P30D5 2014 GMC Sierra indicates NOx Sensor 3 Signal Message Counter Incorrect.
Common causes: Common causes include Faulty NOx Sensor 3, NOx Sensor 3 harness is open or shorted, NOx Sensor 3 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 156

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 P30D5 2014 GMC Sierra 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 3 Signal Message Counter is Incorrect.

OBDII Code P30D5 2014 GMC Sierra - NOx Sensor 3 Signal Message Counter Incorrect - AutoCodes.com — P30D5 2014 GMC Sierra Code - NOx Sensor 3 Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P30D5 2014 GMC Sierra?

Faulty NOx Sensor 3
NOx Sensor 3 harness is open or shorted
NOx Sensor 3 circuit poor electrical connection

How to Fix the DTC P30D5 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 P30D5 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 P30D5 2014 GMC Sierra code?

Need more information on how to fix the P30D5 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P30D5 2014 GMC Sierra Code

1. What does the OBDII code P30D5 mean on a 2014 GMC Sierra?

The P30D5 code indicates that the third NOx (Nitrogen Oxide) sensor has detected an issue with its signal message counter, meaning the data from the sensor is either inconsistent or invalid.

2. What are common symptoms of the P30D5 code on a GMC Sierra?

Common symptoms include the check engine light turning on, reduced fuel efficiency, possible limp mode activation, and issues with emission system performance.

3. What causes the P30D5 code to appear?

The code can be triggered by a faulty NOx sensor, wiring or connector issues, a software glitch in the engine control module (ECM), or excessive soot buildup affecting sensor readings.

4. Can I drive my 2014 GMC Sierra with the P30D5 code?

Itâ€™s possible to drive with this code, but itâ€™s not recommended as it may lead to reduced performance, higher emissions, and potential damage to the exhaust system over time.

5. How do you diagnose the P30D5 code on a GMC Sierra?

Diagnosis includes scanning for additional codes, inspecting the NOx sensor and wiring for damage, checking the ECM for updates, and performing live data analysis to verify sensor functionality.

6. How do you fix the P30D5 code on a 2014 GMC Sierra?

Repairs may involve replacing the faulty NOx sensor, repairing or replacing damaged wiring or connectors, updating the ECM software, or cleaning soot buildup in the exhaust system.

7. How much does it cost to repair the P30D5 code on a GMC Sierra?

The cost can vary, but replacing a NOx sensor typically ranges from $300 to $600, depending on labor rates and parts pricing.

8. Does the P30D5 code affect emissions tests?

Yes, this code can cause your vehicle to fail an emissions test because it impacts the accuracy of NOx monitoring in the exhaust system.

9. Can a software update resolve the P30D5 code on a GMC Sierra?

In some cases, a software update to the ECM can fix communication or calibration issues causing the P30D5 code.

10. How can I prevent the P30D5 code from recurring?

Regular maintenance, including monitoring the exhaust system, keeping sensors clean, and addressing ECM updates promptly, can help prevent this code from recurring.