AutoCodes – GMC – B1527 GMC

B1527 GMC 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 GMC 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 2,429

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 GMC 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 GMC - Parasitic Load - AutoCodes.com — B1527 GMC Code - Parasitic Load

What does this mean?

What are the Possible Causes of the DTC B1527 GMC?

Faulty Battery
Low Battery Charge
Charging System

How to Fix the DTC B1527 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 B1527 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 B1527 GMC code?

Need more information on how to fix the B1527 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1527 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

B1527 2014 GMC Sierra — Parasitic Load
B1527 2015 GMC Sierra — Parasitic Load
B1527 2016 GMC Sierra — Parasitic Load
B1527 2017 GMC Sierra — Parasitic Load
B1527 2018 GMC Sierra — Parasitic Load

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 GMC Code

1. What are the common symptoms of OBDII code B1527 GMC (Parasitic Load)?

Common symptoms include a drained battery, difficulty starting the vehicle, and flickering or dimming lights.

2. What can cause the OBDII code B1527 GMC (Parasitic Load) to trigger?

The code is typically triggered by excessive or abnormal electrical current draw when the vehicle is turned off.

3. How can I diagnose the source of a parasitic load causing the B1527 code?

To diagnose a parasitic load issue, you can use a multimeter to measure the current draw when the vehicle is off, systematically checking each electrical component to find the culprit.

4. Are there any common culprits for parasitic loads in GMC vehicles?

Common culprits for parasitic loads in GMC vehicles include malfunctioning interior lights, aftermarket accessories, faulty control modules, and wiring issues.

5. Can a bad battery cause the B1527 code to appear?

Yes, a weak or failing battery can contribute to a parasitic load issue, potentially triggering the B1527 code.

6. How can I repair a parasitic load issue related to the B1527 code?

Repairing a parasitic load issue may involve replacing faulty components, repairing damaged wiring, disconnecting aftermarket accessories, or resetting control modules.

7. Are there any preventive measures to avoid encountering the B1527 code?

Regularly checking the electrical system, ensuring all accessories are properly installed, and addressing any warning signs promptly can help prevent issues leading to the B1527 code.

8. Can a DIY enthusiast fix a parasitic load issue causing the B1527 code?

While diagnosing and fixing a parasitic load issue can be challenging, DIY enthusiasts with electrical knowledge and the right tools can attempt to troubleshoot and repair the problem.

9. Is it safe to continue driving with the B1527 code present?

It is not recommended to continue driving with the B1527 code present, as a parasitic load issue can drain the battery and potentially leave you stranded.

10. Will resetting the OBDII code B1527 GMC resolve the parasitic load issue?

Resetting the code may temporarily clear the warning, but it will not fix the underlying parasitic load issue causing the code to appear. It is essential to address the root cause to prevent future occurrences.