AutoCodes – GMC – B1527 2017 GMC Sierra

B1527 2017 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 2017 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 188

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 2017 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 2017 GMC Sierra - Parasitic Load - AutoCodes.com — B1527 2017 GMC Sierra Code - Parasitic Load

What does this mean?

What are the Possible Causes of the DTC B1527 2017 GMC Sierra?

Faulty Battery
Low Battery Charge
Charging System

How to Fix the DTC B1527 2017 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 2017 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 2017 GMC Sierra code?

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Need Help with the 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 2017 GMC Sierra Code

1. What does the OBDII code B1527 mean on a 2017 GMC Sierra?

B1527 indicates a "Parasitic Load" fault, meaning the vehicle has detected excessive electrical current draw while the vehicle is off.

2. What are the common symptoms of the B1527 code on a 2017 GMC Sierra?

Symptoms include a drained or dead battery, difficulty starting the vehicle, or electrical malfunctions when the vehicle is off.

3. What causes the B1527 code to appear on a 2017 GMC Sierra?

Common causes include a faulty module, a short circuit, an accessory left on, or a malfunctioning electrical component such as a relay or switch.

4. Can a weak battery trigger the B1527 code on a 2017 GMC Sierra?

Yes, a weak or failing battery can contribute to the code if it struggles to hold a charge and mimics the effects of a parasitic load.

5. How is the B1527 code diagnosed on a 2017 GMC Sierra?

A technician will use a multimeter to measure current draw, inspect circuits, and test individual components to identify the source of the parasitic drain.

6. Can I drive my 2017 GMC Sierra with the B1527 code active?

While the vehicle may still operate, driving with this code can lead to a drained battery and potential starting issues, so itâ€™s best to address it promptly.

7. How can I fix the B1527 code on my 2017 GMC Sierra?

Repairs may include replacing a faulty module, repairing a short circuit, or disconnecting accessories causing the parasitic draw.

8. Does the B1527 code always require professional repair?

Not always. If the issue is caused by an accessory being left on, such as a phone charger, you can resolve it yourself by unplugging the device.

9. How much does it cost to fix the B1527 code on a 2017 GMC Sierra?

Repair costs vary depending on the cause but typically range from $100 to $500, with higher costs for module replacements or extensive wiring repairs.

10. How can I prevent the B1527 code from recurring on my 2017 GMC Sierra?

Regularly check for devices or accessories left plugged in, maintain the battery's health, and inspect wiring for damage or corrosion.