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P0B35 OBD2: High Voltage Service Disconnect Circuit Low

P0B35 OBD2: High Voltage Service Disconnect Circuit Low

What Does the P0B35 Code Mean?

The P0B35 code pertains to the high voltage service disconnect circuit being low. This code is stored when the Battery Energy Control Module (BECM) cannot accurately determine whether the service disconnect plug is connected or not. This situation can prevent the high voltage system from operating correctly.

What Causes the P0B35 Code?

Several factors can trigger the P0B35 code, including:

  • Failure of the Battery Energy Control Module (BECM)
  • Damaged service disconnect plug
  • Improper connection of the service disconnect plug
  • Wiring issues related to the high voltage system

What Are the Symptoms of the P0B35 Code?

When the P0B35 code is present, you may notice that the high voltage system may not operate correctly. This can lead to various performance issues in hybrid or electric vehicles.

How Serious Is the P0B35 Code?

The P0B35 code is categorized as urgent. Immediate action is necessary to address this code because it can indicate a significant malfunction that could potentially cause severe damage to the vehicle or pose a risk to the driver and passengers.

How to Diagnose the P0B35 Code

To diagnose the P0B35 code, follow these steps:

  1. Use an OBD-II scanner to confirm the presence of the P0B35 code.
  2. Inspect the service disconnect plug for any visible damage or improper connection.
  3. Check the wiring associated with the high voltage system for any signs of wear or damage.
  4. Test the functionality of the Battery Energy Control Module (BECM) to ensure it is operating correctly.

Common Repairs for the P0B35 Code

Depending on the diagnosis, common repairs for the P0B35 code may include:

  • Replacing a faulty Battery Energy Control Module (BECM)
  • Repairing or replacing a damaged service disconnect plug
  • Ensuring the service disconnect plug is securely connected
  • Addressing any wiring issues found during the inspection

How Much Does It Cost to Fix the P0B35 Code?

The cost to fix the P0B35 code can vary widely based on the underlying issue. Minor repairs, such as reconnecting a loose plug, may cost less than $100, while replacing a Battery Energy Control Module can range from $500 to $1,500, depending on the vehicle make and model.

Can I Fix the P0B35 Code Myself?

While some DIY enthusiasts may be able to address minor issues, such as ensuring the service disconnect plug is connected correctly, diagnosing and repairing components like the BECM typically requires professional expertise and specialized equipment. It is advisable to consult a professional mechanic to ensure a proper and safe repair.

About JC Landry

JC is the Senior Editor at eManualOnline.com, GarageSpot.com, and Drive-My.com, as well as the Webmaster of TheMechanicDoctor.com, only to name a few. He's been a certified Master Mechanic for 15 years, working for various car dealers and specialized repair shops before turning towards blogging about cars and EVs in the hope of helping the next generation of automotive technicians. He also loves cats, Johnny Cash and Subarus.

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