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Engine-Codes – GMC – B1325 2018 GMC Sierra

B1325 2018 GMC Sierra Code - Device Power Circuit Voltage

Quick Answer

The B1325 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Device Power Circuit Voltage. Common causes include Faulty Wiring: Damaged or corroded wiring can disrupt the voltage supply to the device, Failing Voltage Regulator: A failing voltage regulator can lead to fluctuations in the power supply, Weak Battery: A weak or failing battery may not provide sufficient power to the device. 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
B1325 2018 GMC Sierra indicates Device Power Circuit Voltage.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring can disrupt the voltage supply to the device, Failing Voltage Regulator: A failing voltage regulator can lead to fluctuations in the power supply, Weak Battery: A weak or failing battery may not provide sufficient power to the device.
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 16, 2024
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Code B1325 2018 GMC Sierra Description

The B1325 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Device Power Circuit Voltage. This code indicates that there is an issue with the voltage supply to a specific device or system within the vehicle. In modern vehicles like the GMC Sierra, various electronic components and systems rely on a stable power supply to function correctly. When the voltage supply to a particular device falls outside the expected range, it can lead to malfunctions, erratic behavior, or complete failure of that component.

OBDII Code B1325 2018 GMC Sierra - Device Power Circuit Voltage
B1325 2018 GMC Sierra Code - Device Power Circuit Voltage

Common Causes of B1325 2018 GMC Sierra

  1. Faulty Wiring: Damaged or corroded wiring can disrupt the voltage supply to the device.
  2. Failing Voltage Regulator: A failing voltage regulator can lead to fluctuations in the power supply.
  3. Weak Battery: A weak or failing battery may not provide sufficient power to the device.
  4. Alternator Issues: Problems with the alternator, such as a faulty diode or worn-out brushes, can impact the voltage supply.

Symptoms of B1325 2018 GMC Sierra

  1. Check Engine Light: The illumination of the check engine light is a common symptom associated with the B1325 DTC.
  2. Erratic Behavior: The affected device may exhibit erratic behavior, such as intermittent operation or sudden failure.
  3. Electrical Malfunctions: Other electrical components in the vehicle may start malfunctioning, indicating a broader power supply issue.
  4. Poor Performance: The vehicle may experience reduced performance, fuel efficiency, or drivability issues.

How to Fix B1325 2018 GMC Sierra

  1. Diagnostic Testing: Use a multimeter to test the voltage supply to the affected device and identify the source of the issue.
  2. Inspect Wiring and Connectors: Check the wiring harness and connectors for any damage, corrosion, or loose connections.
  3. Test Battery and Alternator: Verify the condition of the battery and alternator to ensure they are functioning correctly.
  4. Replace Faulty Components: Replace any faulty wiring, connectors, voltage regulator, battery, or alternator as needed.
  5. Clear Codes and Test: Clear the DTC from the vehicle's computer after repairs are completed and test the affected device to ensure proper operation.

Cost to Fix B1325 2018 GMC Sierra

The cost of repairing a Device Power Circuit Voltage issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the repair costs for this type of issue can range from $100 to $500, including parts and labor. However, it's important to note that the actual cost can be higher if more extensive repairs are required or if specialized components need to be replaced. Additionally, the diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to consult with a trusted mechanic or dealership to get a more accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for B1325 2018 GMC Sierra

- B1325 03: Control Module Power Circuit Low Voltage

- B1325 07: Control Module Power Circuit High Voltage

- B1325 4A Device Power Circuit Checksum Error

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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 B1325 2018 GMC Sierra Code

1. What does the OBDII code B1325 mean for a 2018 GMC Sierra?

Code B1325 refers to an issue with the "Device Power Circuit Voltage," indicating a problem with the power supply to a module or component.

2. What are the common symptoms of code B1325 in a 2018 GMC Sierra?

Symptoms may include warning lights on the dashboard, erratic electrical behavior, or intermittent functionality of certain modules like the body control module (BCM).

3. What causes the B1325 code in a 2018 GMC Sierra?

Common causes include a weak or failing vehicle battery, loose or corroded battery terminals, wiring issues, or a faulty ground connection.

4. Can a low battery trigger the B1325 code in a GMC Sierra?

Yes, a low or weak battery can cause voltage irregularities, which may trigger the B1325 code.

5. How do I diagnose the B1325 code on my 2018 GMC Sierra?

Start by checking the battery voltage and connections, inspect wiring harnesses for damage, and test the ground connections to ensure they are secure and free of corrosion.

6. Is the B1325 code serious on a 2018 GMC Sierra?

While not critical, it can lead to electrical issues or module malfunctions if not addressed promptly, which may affect vehicle functionality.

7. How is the B1325 code fixed on a 2018 GMC Sierra?

Repairs may include charging or replacing the battery, cleaning and tightening battery terminals, repairing or replacing damaged wiring, or re-establishing proper ground connections.

8. Can a failing alternator cause the B1325 code in a GMC Sierra?

Yes, a failing alternator can cause inconsistent voltage supply, potentially triggering the B1325 code.

9. Does clearing the B1325 code fix the problem on a GMC Sierra?

Clearing the code may turn off the warning temporarily, but the underlying issue must be addressed to prevent the code from returning.

10. Can a professional scan tool provide more insight into the B1325 code in a GMC Sierra?

Yes, a professional scan tool can check for related codes, monitor voltage data in real-time, and help pinpoint the root cause of the issue.

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