AutoCodes – GMC – B1527 2015 GMC Sierra

B1527 2015 GMC Sierra Code - Parasitic Load

Quick Answer

The components most likely to cause a parasitic draw on the battery of the vehicle are switches, relays, and control modules. Common causes include Faulty Battery, Low Battery Charge, Charging System. 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: B1527 2015 GMC Sierra indicates Parasitic Load.
Common causes: Common causes include Faulty Battery, Low Battery Charge, Charging System.
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 157

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 Apr 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1527 2015 GMC Sierra Description

The components most likely to cause a parasitic draw on the battery of the vehicle are switches, relays, and control modules. After the ignition is turned OFF the control modules will begin to go to sleep (shut OFF). All control modules do not go to sleep at the same time, some, like the Heating, Ventilation, and Air-Conditioning (HVAC) and body control modules, may take up to 30 min or longer after turning the ignition off before going to sleep. Others such as the ON Star and keyless entry control modules may periodically wake up then go back to sleep. These are all normal conditions. The Body Control Module (BCM) monitors the state of charge of the electrical system. If the BCM senses that the state of charge at ignition On is 30% lower than what it was when the engine was running.

OBDII Code B1527 2015 GMC Sierra - Parasitic Load - AutoCodes.com — B1527 2015 GMC Sierra Code - Parasitic Load

What does this mean?

What are the Possible Causes of the DTC B1527 2015 GMC Sierra?

Faulty Battery
Low Battery Charge
Charging System

How to Fix the DTC B1527 2015 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 B1527 2015 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 B1527 2015 GMC Sierra 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 B1527 2015 GMC Sierra Code

1. What does the OBDII code B1527 indicate on a 2015 GMC Sierra?

The code B1527 on a 2015 GMC Sierra indicates an issue with the vehicleâ€™s electrical system, specifically pointing towards a "Parasitic Load" which drains the battery even when the vehicle is off.

2. What are common symptoms of code B1527 in a 2015 GMC Sierra?

Common symptoms include a battery that frequently drains, needing frequent jump-starts, dimming headlights and interior lights, and possible issues with electrical components not functioning properly when the vehicle is off.

3. What can cause the B1527 code to appear on a 2015 GMC Sierra?

The B1527 code can be triggered by several issues such as a faulty alternator, defective battery, poor battery connections, or electrical shorts in the system that continue to draw power.

4. How can I diagnose the cause of a B1527 code in a 2015 GMC Sierra?

To diagnose, start by checking the batteryâ€™s health and connections. Use a multimeter to check for any unusual drain or draw from the battery when the vehicle is turned off. Inspect the alternator and wiring for any visible signs of wear or damage.

5. What are the steps to fix the B1527 code on a 2015 GMC Sierra?

To fix the B1527 code, identify and resolve the source of the parasitic drain. This may involve replacing a faulty alternator, securing loose connections, replacing the battery if it is old or damaged, or repairing any electrical shorts found in the system.

6. How urgent is it to address the B1527 code on a 2015 GMC Sierra?

It is quite urgent to address the B1527 code, as a parasitic drain can lead to the battery being completely drained, potentially leaving you stranded and unable to start the vehicle.

7. Can ignoring the B1527 code lead to further vehicle damage?

Yes, ignoring the B1527 code can lead to further damage such as battery failure, alternator overwork, and potential damage to the vehicleâ€™s electrical system components due to low voltage or frequent power drains.

8. What tools are necessary to diagnose a B1527 code on a 2015 GMC Sierra?

Diagnosing a B1527 code typically requires a digital multimeter to measure battery drain, and a diagnostic scanner to read and clear OBDII codes. Additionally, a test light might be helpful for checking connection integrity.

9. Is it possible for a B1527 code to clear on its own on a 2015 GMC Sierra?

No, a B1527 code will not clear on its own. The underlying issue causing the parasitic drain must be addressed and resolved, and then the code needs to be manually cleared using an OBDII scanner.