AutoCodes – Buick – B1448 Buick

B1448 Buick Code - Accessory Power Relay Circuit

Quick Answer

The Body Control Module (BCM) supplies accessory voltage as required for the Rear Wiper Motor and controls the Rear wiper and washer relay through the accessory voltage circuit from BCM harness. Common causes include Faulty Accessory Power Relay, Accessory Power Relay harness is open or shorted, Accessory Power Relay circuit poor electrical connection. 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: B1448 Buick indicates Accessory Power Relay Circuit.
Common causes: Common causes include Faulty Accessory Power Relay, Accessory Power Relay harness is open or shorted, Accessory Power Relay circuit poor electrical connection.
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 1,042

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 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1448 Buick Description

The Body Control Module (BCM) supplies accessory voltage as required for the Rear Wiper Motor and controls the Rear wiper and washer relay through the accessory voltage circuit from BCM harness. The Diagnostic Trouble Code (DTC) will set only when the output is activated and there is a short to ground in the accessory voltage circuit.

OBDII Code B1448 Buick - Accessory Power Relay Circuit - AutoCodes.com — B1448 Buick Code - Accessory Power Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B1448 Buick?

Faulty Accessory Power Relay
Accessory Power Relay harness is open or shorted
Accessory Power Relay circuit poor electrical connection
Faulty Rear Wiper Motor
Faulty Body Control Module (BCM)

How to Fix the DTC B1448 Buick?

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 B1448 Buick 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.

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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 B1448 Buick Code

1. What does the OBDII code B1448 mean for a Buick?

The code B1448 indicates a fault in the Accessory Power Relay Circuit, which controls power delivery to certain accessories when the ignition is on.

2. What are common symptoms of code B1448 on a Buick?

Symptoms may include non-functional accessories like the radio, interior lights, or power outlets, as well as intermittent power issues.

3. What causes code B1448 to appear on a Buick?

Common causes include a faulty accessory power relay, damaged wiring or connectors, or an issue with the fuse related to the relay circuit.

4. How do you diagnose code B1448 in a Buick?

Diagnosis typically involves inspecting the accessory power relay, checking for damaged wiring or connectors, testing the circuit for continuity, and verifying the power supply to the relay.

5. Can a faulty accessory power relay trigger code B1448 on a Buick?

Yes, a faulty accessory power relay is one of the most common causes of this code.

6. How can code B1448 affect the functionality of a Buick?

This code can lead to certain accessories not working, which may reduce convenience and comfort for the driver and passengers.

7. Is code B1448 on a Buick a serious issue?

While it doesn't typically affect drivability, it can cause inconvenience by disabling certain accessories, and it should be addressed to prevent further electrical problems.

8. How do you fix code B1448 on a Buick?

Fixes include replacing the accessory power relay, repairing damaged wiring or connectors, and ensuring the fuse related to the circuit is intact.

9. Can clearing code B1448 solve the problem on a Buick?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.

10. How much does it cost to repair code B1448 on a Buick?

Repair costs can vary depending on the issue, ranging from $50-$150 for a replacement relay to higher costs if wiring or additional components need repair.