AutoCodes – GMC – B1527 2016 GMC Sierra

B1527 2016 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 2016 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 207

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 2016 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 2016 GMC Sierra - Parasitic Load - AutoCodes.com — B1527 2016 GMC Sierra Code - Parasitic Load

What does this mean?

What are the Possible Causes of the DTC B1527 2016 GMC Sierra?

Faulty Battery
Low Battery Charge
Charging System

How to Fix the DTC B1527 2016 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 2016 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 2016 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 2016 GMC Sierra Code

What does the OBDII code B1527 mean on a 2016 GMC Sierra?

1. Code B1527 indicates a "Parasitic Load," meaning there is an electrical drain on the vehicle's battery when it should be at rest. 2.

What are the common symptoms of the B1527 code in a 2016 GMC Sierra?

Symptoms may include a dead or weakened battery, difficulty starting the vehicle, and potential warning lights on the dashboard. 3.

What causes the B1527 code to appear in a 2016 GMC Sierra?

The code is often caused by faulty electrical components, a malfunctioning module, or wiring issues that result in excessive battery drain when the vehicle is off. 4.

How can I diagnose the cause of the B1527 code in my GMC Sierra?

Start by checking the battery and alternator, use a multimeter to measure parasitic draw, and inspect wiring and electrical components for faults or damage. 5.

Can a faulty battery trigger the B1527 code in a 2016 GMC Sierra?

Yes, a weak or failing battery can contribute to parasitic load issues and may trigger the code. 6.

How do I fix the B1527 code in my 2016 GMC Sierra?

Repairs may include replacing a faulty module, repairing damaged wiring, or addressing malfunctioning electrical components causing the drain. 7.

Is it safe to drive with the B1527 code active in my GMC Sierra?

While it may not immediately impact driveability, prolonged battery drain can leave you stranded if the vehicle fails to start. Itâ€™s best to address the issue promptly. 8.

How much parasitic draw is considered normal for a 2016 GMC Sierra?

A normal parasitic draw should typically be below 50 milliamps (0.05 amps) when the vehicle is off. 9.

Can leaving accessories plugged in cause the B1527 code in a GMC Sierra?

Yes, leaving accessories like phone chargers or dash cams plugged in can contribute to parasitic draw and potentially trigger the code. 10.

Do I need a professional mechanic to fix the B1527 code in my 2016 GMC Sierra?

While basic checks like testing the battery or alternator can be done at home, diagnosing and fixing wiring or module failures may require professional tools and expertise.