AutoCodes – Generic – B305E

B305E Code - Interruptible RAP Relay Circuit

Quick Answer

The Keyless Entry Control Module controls the retained accessory power relays through the control circuit by applying voltage to the interruptible retained accessory power relay coil control circuit. Common causes include Faulty Retained Accessory Power Relay, Retained Accessory Power Relay harness is open or shorted, Retained 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: B305E indicates Interruptible RAP Relay Circuit.
Common causes: Common causes include Faulty Retained Accessory Power Relay, Retained Accessory Power Relay harness is open or shorted, Retained 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 2,198

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 Mar 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B305E Description

The Keyless Entry Control Module controls the retained accessory power relays through the control circuit by applying voltage to the interruptible retained accessory power relay coil control circuit. The Retained Accessory Power Relays are energized when the ignition is in the ACCESSORY or the ON position. The relays are also energized for approximately 10 min after shutting the ignition OFF, providing no door is opened.

OBDII Code B305E - Interruptible RAP Relay Circuit - AutoCodes.com — B305E Code - Interruptible RAP Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B305E?

Faulty Retained Accessory Power Relay
Retained Accessory Power Relay harness is open or shorted
Retained Accessory Power Relay circuit poor electrical connection
Faulty Keyless Entry Control Module

How to Fix the DTC B305E?

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 B305E 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 B305E code?

Need more information on how to fix the B305E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B305E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B305E Buick — Interruptible RAP Relay Circuit
B305E Cadillac — Interruptible RAP Relay Circuit
B305E Chevrolet — Interruptible RAP Relay Circuit
B305E GMC — Interruptible RAP Relay Circuit

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 B305E Code

1. What does the OBDII code B305E mean?

B305E indicates an issue with the Interruptible Retained Accessory Power (RAP) Relay Circuit, often related to power supply problems for retained accessory systems.

2. What are the common symptoms of code B305E?

Symptoms include accessories like the radio, power windows, or sunroof not functioning after the ignition is turned off, or they may shut off unexpectedly.

3. What causes the B305E code?

Common causes include a faulty RAP relay, damaged wiring or connectors in the RAP circuit, or a problem with the Body Control Module (BCM).

4. Can a weak battery cause the B305E code?

Yes, a weak or failing battery can disrupt the RAP system's operation and potentially trigger the B305E code.

5. How do you diagnose the B305E code?

Diagnosis involves inspecting the RAP relay, checking for damaged or corroded wiring, testing the BCM, and verifying system voltages.

6. Can the B305E code cause other electrical issues?

Yes, it may lead to broader issues with retained accessory systems or intermittent electrical malfunctions in the vehicle.

7. How can I fix the B305E code?

Repairs may include replacing the RAP relay, repairing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the Body Control Module.

8. Is it safe to drive with the B305E code?

Generally, the vehicle can still be driven, but you may experience inconvenience due to non-functional accessories. Prompt repair is recommended.

9. How much does it cost to fix the B305E code?

Repair costs vary but typically range from $50 to $250, depending on whether the problem is with the relay, wiring, or BCM.

10. Can a DIYer fix the B305E code?

Yes, if you have basic tools and electrical knowledge, you can check the relay and wiring. However, BCM-related issues may require professional assistance.