AutoCodes – GMC – B1385 GMC

B1385 GMC Code - Device Ignition START Circuit

Quick Answer

The Body Control Module (BCM), monitors the ignition inputs OFF, ignition 3, crank and ignition 1 supplied from the ignition switch. Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch 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: B1385 GMC indicates Device Ignition START Circuit.
Common causes: Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch 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 993

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 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1385 GMC Description

The Body Control Module (BCM), monitors the ignition inputs OFF, ignition 3, crank and ignition 1 supplied from the ignition switch. The BCM uses the sequence that the signals appear and their voltage levels to determine the power mode called for by the vehicle operator using the ignition switch. A 12-volt reference voltage is supplied by the BCM to the ignition switch over a discrete circuit. The ignition switch uses this voltage for power mode signal discrimination. When the operator places the Ignition switch in the Start position, the Crank circuit delivers the signal to the BCM.

OBDII Code B1385 GMC - Device Ignition START Circuit - AutoCodes.com — B1385 GMC Code - Device Ignition START Circuit

What does this mean?

What are the Possible Causes of the DTC B1385 GMC?

Faulty Ignition Switch
Ignition Switch harness is open or shorted
Ignition Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1385 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 B1385 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 B1385 GMC code?

Need more information on how to fix the B1385 GMC code? Get Access to Factory Service Manuals

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 B1385 GMC Code

1. What are common symptoms of OBDII code B1385 GMC Device Ignition START Circuit?

- Common symptoms include difficulty starting the vehicle, intermittent starting problems, and potential engine stalling.

2. What are the possible causes of OBDII code B1385 GMC Device Ignition START Circuit?

- Possible causes may include issues with the ignition switch, wiring or connection problems in the START circuit, faulty ignition lock cylinder, or a defective starter motor.

3. How can I diagnose the OBDII code B1385 GMC Device Ignition START Circuit?

- Diagnosis usually involves checking the ignition system components for proper operation, inspecting wiring for damages or loose connections, and testing the starter motor for functionality.

4. Can a DIY enthusiast repair the OBDII code B1385 GMC Device Ignition START Circuit?

- While some basic troubleshooting like checking connections and fuses can be done by DIY enthusiasts, diagnosing and repairing advanced electrical issues may require professional help.

5. Are there any quick tips to troubleshoot OBDII code B1385 GMC Device Ignition START Circuit?

- Quick tips include checking the battery for proper voltage, inspecting the ignition switch for signs of wear, and ensuring all connections related to the START circuit are secure.

6. Is it safe to continue driving with OBDII code B1385 GMC Device Ignition START Circuit?

- It is not recommended to drive with this code present, as it can lead to potential starting or stalling issues, which can be unsafe and may cause further damage to the vehicle.

7. How much does it typically cost to repair OBDII code B1385 GMC Device Ignition START Circuit?

- Repair costs can vary depending on the root cause of the issue, but on average, it may range from $100 to $500, including parts and labor.

8. Can a faulty ignition switch trigger OBDII code B1385 GMC Device Ignition START Circuit?

- Yes, a faulty ignition switch can disrupt the START circuit operation and trigger the B1385 trouble code, leading to starting problems.

9. Will resetting the OBDII code B1385 GMC Device Ignition START Circuit clear the issue permanently?

- Resetting the code may temporarily clear the issue, but if the root cause is not addressed, the problem is likely to recur. It is essential to diagnose and repair the underlying problem.

10. How long does it take to repair OBDII code B1385 GMC Device Ignition START Circuit?

- The repair time can vary based on the specific issue causing the code. Simple fixes like replacing a fuse may take minutes, while more complex repairs involving the starter motor or wiring could take several hours.