AutoCodes – GMC – P1019 GMC

P1019 GMC Code - Reductant Control Module Sensor Communication Voltage Supply Circuit High Voltage

Quick Answer

The Reductant Quality Sensor is located in the reductant tank and uses an ultrasonic signal to measure reductant fluid quality. Common causes include Faulty Reductant Control Module, Reductant Control Module harness is open or shorted, Reductant Control Module 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: P1019 GMC indicates Reductant Control Module Sensor Communication Voltage Supply Circuit High Voltage.
Common causes: Common causes include Faulty Reductant Control Module, Reductant Control Module harness is open or shorted, Reductant Control Module 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 426

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 Jul 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1019 GMC Description

The Reductant Quality Sensor is located in the reductant tank and uses an ultrasonic signal to measure reductant fluid quality. The Reductant Quality Sensor includes an integrated temperature sensor to measure reductant fluid temperature. The Reductant Quality Sensor communicates with the Reductant Control Module using serial data. The Diagnostic Trouble Code (DTC) will be set if the reductant control module detects a short to voltage on the 5 V reference circuit for greater than 1 s

OBDII Code P1019 GMC - Reductant Control Module Sensor Communication Voltage Supply Circuit High Voltage - AutoCodes.com — P1019 GMC Code - Reductant Control Module Sensor Communication Voltage Supply Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1019 GMC?

Faulty Reductant Control Module
Reductant Control Module harness is open or shorted
Reductant Control Module circuit poor electrical connection
Faulty Reductant Quality Sensor

How to Fix the DTC P1019 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 P1019 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 P1019 GMC code?

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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 P1019 GMC Code

1. What are the common symptoms of OBDII code P1019 GMC?

- Common symptoms include the Check Engine Light (CEL) illuminating, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What causes the OBDII code P1019 GMC to trigger?

- This code is typically triggered by a high voltage supply circuit issue within the reductant control module sensor communication.

3. How serious is the P1019 GMC code?

- While the severity can vary, it's important to address this code promptly as it can lead to poor engine performance and potential emissions-related problems.

4. Can I continue driving my vehicle with the P1019 GMC code?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage and potential emissions issues.

5. How can I diagnose the P1019 GMC code?

- Diagnosis usually involves using an OBDII scanner to read the code, inspecting the reductant control module sensor communication circuit, and checking for any loose connections or damaged wiring.

6. What repairs are typically needed for the P1019 GMC code?

- Repairs may involve repairing or replacing damaged wiring, connectors, or the reductant control module itself, depending on the specific issue detected.

7. Are there any DIY fixes for the P1019 GMC code?

- DIY fixes may be possible if the issue is related to a loose connection or damaged wire, but more complex repairs may require professional assistance.

8. How much does it cost to repair the P1019 GMC code?

- Repair costs can vary depending on the extent of the issue and whether any components need to be replaced, but it's advisable to get a professional diagnosis for an accurate estimate.

9. Can the P1019 GMC code be related to other codes or issues?

- Yes, this code may be related to other codes indicating issues with the vehicle's emissions system, so it's important to address any related codes as well.

10. How can I prevent the P1019 GMC code from recurring?

- Regular maintenance, such as checking and replacing faulty components in the emissions system, can help prevent the recurrence of the P1019 GMC code.