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Engine-Codes – GMC – P1015 GMC

P1015 GMC Code - Reductant Control Module Sensor Serial Communication Circuit Low Voltage

Quick Answer

The P1015 GMC code indicates a problem with the Reductant Control Module Sensor Serial Communication Circuit, specifically detecting low voltage. Common causes include Faulty Reductant Control Module Sensor: A malfunctioning sensor can lead to low voltage communication with the module, Wiring Issues: Damaged or corroded wiring connecting the sensor to the module can cause low voltage readings, Poor Electrical Connection: Loose or poor electrical connections can disrupt the communication circuit, resulting in low voltage. 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
P1015 GMC indicates Reductant Control Module Sensor Serial Communication Circuit Low Voltage.
Common causes
Common causes include Faulty Reductant Control Module Sensor: A malfunctioning sensor can lead to low voltage communication with the module, Wiring Issues: Damaged or corroded wiring connecting the sensor to the module can cause low voltage readings, Poor Electrical Connection: Loose or poor electrical connections can disrupt the communication circuit, resulting in low voltage.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1015 GMC Description

The P1015 GMC code indicates a problem with the Reductant Control Module Sensor Serial Communication Circuit, specifically detecting low voltage. The Reductant Control Module is a crucial component in the vehicle's emissions system, responsible for monitoring and controlling the level of urea solution (AdBlue) injected into the exhaust stream to reduce harmful emissions. The sensor communicates with the module to ensure that the proper amount of urea is injected to effectively treat the exhaust gases.

OBDII Code P1015 GMC - Reductant Control Module Sensor Serial Communication Circuit Low Voltage
P1015 GMC Code - Reductant Control Module Sensor Serial Communication Circuit Low Voltage

Common Causes of P1015 GMC

  1. Faulty Reductant Control Module Sensor: A malfunctioning sensor can lead to low voltage communication with the module.
  2. Wiring Issues: Damaged or corroded wiring connecting the sensor to the module can cause low voltage readings.
  3. Poor Electrical Connection: Loose or poor electrical connections can disrupt the communication circuit, resulting in low voltage.
  4. Software/Programming Issues: Sometimes, software glitches or programming errors can cause communication problems within the emissions system.

Symptoms of P1015 GMC

  1. Check Engine Light: The most common symptom associated with the P1015 code is the illumination of the check engine light on the dashboard.
  2. Reduced Fuel Efficiency: A decrease in fuel efficiency may be noticed due to improper urea injection into the exhaust stream.
  3. Engine Misfires: The engine may experience misfires or hesitation during acceleration due to the faulty communication circuit.
  4. Failed Emissions Test: If the issue is not addressed, it can lead to increased emissions output, causing the vehicle to fail emissions tests.

How to Fix P1015 GMC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific fault code and identify the root cause of the low voltage communication.
  2. Check Wiring and Connections: Inspect the wiring harness and connections between the sensor and module for any damage or corrosion. Repair or replace as necessary.
  3. Test Sensor Functionality: Test the Reductant Control Module Sensor to ensure it is functioning properly. Replace the sensor if it is faulty.
  4. Clear Fault Codes: Clear the fault codes with the diagnostic scanner after completing the repairs to reset the check engine light.
  5. Perform Emissions System Reset: After repairing the issue, perform an emissions system reset to ensure proper functionality.

Cost to Fix P1015 GMC

The typical repair costs for addressing the P1015 GMC code can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair costs for this issue can range from $200 to $500. However, it's important to note that the diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local auto repair shops for a more accurate estimate based on your specific vehicle.

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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 P1015 GMC Code

1. What does the OBDII code P1015 mean on a GMC vehicle?

Code P1015 indicates a low voltage issue in the serial communication circuit of the Reductant Control Module Sensor, which is part of the diesel exhaust aftertreatment system.

2. What are the common symptoms of a P1015 code?

Symptoms may include the Check Engine Light turning on, reduced engine performance, warnings for the diesel exhaust fluid (DEF) system, or potential issues with emissions compliance.

3. What causes the P1015 code on a GMC?

Common causes include a faulty Reductant Control Module, damaged wiring or connectors in the communication circuit, low system voltage, or issues with the Powertrain Control Module (PCM).

4. Can I drive my GMC with a P1015 code?

Driving with a P1015 code may lead to reduced performance or emissions-related failures. It's best to address the issue promptly to avoid further damage.

5. How do you diagnose a P1015 code?

Diagnosis involves scanning for additional codes, inspecting the wiring and connectors for damage or corrosion, checking the Reductant Control Module, and verifying proper voltage supply to the circuit.

6. How is the P1015 code typically fixed?

Repairs may include replacing damaged wiring or connectors, repairing or replacing the Reductant Control Module, or updating the PCM software if needed.

7. Does the P1015 code require replacing the Reductant Control Module?

Not always. The issue could be caused by faulty wiring or insufficient voltage, so a thorough diagnosis is essential before replacing the module.

8. Can a weak battery cause the P1015 code on a GMC?

Yes, a weak or failing battery can lead to low voltage in the circuit, potentially triggering the P1015 code.

9. Is a dealership required to fix the P1015 code?

While a dealership has specialized tools and knowledge, an experienced mechanic with proper diagnostic equipment can also address the issue.

10. Will clearing the P1015 code with a scan tool fix the problem?

Clearing the code may temporarily turn off the Check Engine Light, but the underlying issue must be resolved to prevent the code from returning.

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