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Engine-Codes – GMC – B1385 GMC

B1385 GMC Code - Device Ignition START Circuit

Quick Answer

The B1385 diagnostic trouble code (DTC) for GMC vehicles refers to an issue with the Device Ignition START Circuit. Common causes include Faulty ignition switch, Defective starter relay, Damaged wiring or connectors in the ignition circuit. 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, Defective starter relay, Damaged wiring or connectors in the ignition circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B1385 GMC Description

The B1385 diagnostic trouble code (DTC) for GMC vehicles refers to an issue with the Device Ignition START Circuit. This code indicates that there is a malfunction in the circuit responsible for initiating the ignition process when starting the vehicle. The ignition system plays a crucial role in starting the engine by providing the necessary spark to ignite the air-fuel mixture in the combustion chambers. When this circuit fails to function properly, it can lead to starting issues, engine misfires, and overall poor performance.

OBDII Code B1385 GMC - Device Ignition START Circuit
B1385 GMC Code - Device Ignition START Circuit

Common Causes of B1385 GMC

  1. Faulty ignition switch
  2. Defective starter relay
  3. Damaged wiring or connectors in the ignition circuit
  4. Failed ignition coil
  5. Ignition system component failure

Symptoms of B1385 GMC

  1. Engine cranks but does not start
  2. Intermittent starting problems
  3. Engine misfires or rough idling
  4. Check Engine Light illuminated
  5. Loss of power or acceleration

How to Fix B1385 GMC

  1. Diagnose the issue by using a scan tool to retrieve the DTC and inspecting the ignition system components for any visible damage.
  2. Test the ignition switch, starter relay, and ignition coil for proper functionality using a multimeter.
  3. Check the wiring and connectors in the ignition circuit for any signs of wear, corrosion, or loose connections.
  4. Replace any faulty components, such as the ignition switch, starter relay, ignition coil, or damaged wiring.
  5. Clear the DTC and test the vehicle to ensure that the issue has been resolved.

Cost to Fix B1385 GMC

The cost of repairing the Device Ignition START Circuit can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair cost for this type of issue can range from $150 to $500. However, it's important to note that the actual cost may be higher or lower based on the location, vehicle make and model, and the rates charged by the auto repair shop. Diagnostic time and labor rates can also impact the overall cost, with rates typically ranging from $80 to $150 per hour. It's recommended to obtain quotes from local auto repair shops to get a more accurate estimate for the repair.

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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.

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