Fuse Block Circuit Breakers

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What does a fuse block circuit breaker do?

Fuse block circuit breakers protect the vehicle’s battery and starter motor. Here’s how: as the electrical current flowing through them increases, the circuit breaker heats until a threshold is reached. When the threshold current and corresponding temperature is reached, an internal connector melts to break the circuit.

Where are fuse block circuit breakers located?

They're typically mounted on the battery post. Note: no special tools are required to remove and replace. 

What are the common causes of failure?

The main cause of premature failure is excessive heat from the engine or electrical short. 

Will faulty circuit breakers illuminate the check engine light?

Yes, a failing circuit breaker can illuminate the Advance Track or MIL with DTCs P0230, P025A, P0627, P0201, P0202, P0203, P0204, P0205, P0207, and P0208.

Signs of malfunctioning fuse block circuit breaker:

• Engine doesn’t start
• Sudden engine stalls
• Battery light ON
• Failure for electrical equipment such as window switches, wipers, etc.