AutoCodes – GMC – P30D5 GMC

P30D5 GMC 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 GMC 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 302

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

What does this mean?

What are the Possible Causes of the DTC P30D5 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the P30D5 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P30D5 2014 GMC Sierra — NOx Sensor 3 Signal Message Counter Incorrect
P30D5 2015 GMC Sierra — NOx Sensor 3 Signal Message Counter Incorrect
P30D5 2016 GMC Sierra — NOx Sensor 3 Signal Message Counter Incorrect
P30D5 2017 GMC Sierra — NOx Sensor 3 Signal Message Counter Incorrect
P30D5 2018 GMC Sierra — NOx Sensor 3 Signal Message Counter Incorrect

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 GMC Code

1. What are the common symptoms of OBDII code P30D5 GMC (NOx Sensor 3 Signal Message Counter Incorrect)?

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

2. What can cause the OBDII code P30D5 GMC to trigger?

- The code can be triggered by issues such as a faulty NOx sensor, wiring problems, or a malfunction in the engine control module.

3. How serious is the OBDII code P30D5 GMC?

- While the code may not cause immediate harm to the vehicle, it can lead to increased emissions and potential long-term damage if left unresolved.

4. How can I diagnose the source of the OBDII code P30D5 GMC?

- Proper diagnosis typically involves using a diagnostic scanner to read the code, inspecting the NOx sensor wiring, and testing the sensor itself for proper functionality.

5. Can I still drive my vehicle with the OBDII code P30D5 GMC present?

- It is generally not recommended to drive the vehicle with this code active, as it can affect engine performance and emissions.

6. What are some repair tips for addressing the OBDII code P30D5 GMC?

- Repair tips may include checking and repairing any damaged wiring, replacing the NOx sensor if necessary, and resetting the engine control module.

7. How much does it cost to repair the OBDII code P30D5 GMC?

- Repair costs can vary depending on the specific issue causing the code, but it is advisable to consult with a professional mechanic for an accurate estimate.

8. Can I reset the OBDII code P30D5 GMC without fixing the underlying issue?

- While you can clear the code temporarily, it is essential to address the root cause to prevent it from reoccurring and potentially causing further damage.

9. Are there any recalls or technical service bulletins related to the OBDII code P30D5 GMC?

- It is advisable to check with your vehicle manufacturer or a reliable automotive source for any relevant recalls or bulletins related to this code.

10. How can I prevent the OBDII code P30D5 GMC from coming back in the future?

- Regular maintenance, such as checking and replacing sensors as needed, keeping up with vehicle inspections, and addressing any engine-related issues promptly, can help prevent the code from reoccurring.