Jeep Code P258B

Jeep owners may encounter the code P258B “Electric Vacuum Pump Performance”. This code can be generated when the Electric Vacuum Pump (EVP) system installed in Jeep vehicles is not performing as intended. The EVP system is connected to the engine and the brake booster through a series of hoses and one-way flow check valves. It is designed to provide supplemental vacuum to the brake booster when the engine vacuum supply is low. Unfortunately, a wide range of factors can cause the EVP to malfunction, leading to the generation of the Jeep code P258B. Understanding this code’s potential causes and solutions is essential for Jeep owners, as it offers insight into addressing and resolving the issue quickly and effectively.

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Causes and Solutions for Jeep Code P258B

Fused B+ Circuit Open

The Fused B+ circuit supplies power to the Electric Vacuum Pump (EVP). When it is open, the EVP will not receive the necessary power to function properly, leading to the generation of the P258B code. Jeep owners must replace the fuse with a new one to fix this issue.

Vacuum Pump Relay Control Circuit

This circuit controls the operation of the EVP. When the circuit is open or has high resistance, the EVP will not receive the necessary operating signal, resulting in the P258B code. To resolve this issue, Jeep owners must check the wiring for any damage or breakage and repair/replace it if needed.

Vacuum Pump Relay Output Circuit

The Vacuum Pump Relay Output Circuit signals the EVP’s operation. When the circuit is open or has high resistance, the EVP will not receive the necessary operating signal, resulting in the P258B code. To resolve this issue, Jeep owners must check the wiring for any damage or breakage and repair/replace it if needed.

Electric Vacuum Pump Ground Circuit

The Electric Vacuum Pump Ground Circuit provides the EVP with ground power. When the circuit is open, the EVP will not receive the necessary ground power to function properly, leading to the generation of the P258B code. Jeep owners must check the wiring for any damage or breakage to fix this issue and repair/replace it if needed.

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Pinched, Cut, or Open Vacuum Supply Line

The Vacuum Supply Line is responsible for carrying the EVP-generated vacuum to the brake booster. When the line is pinched, cut, or open, the EVP cannot supply the necessary vacuum to the brake booster, resulting in the P258B code. Jeep owners must repair or replace the supply line to resolve this issue.

Vacuum Pressure Sensor

The Vacuum Pressure Sensor is responsible for monitoring the pressure of the vacuum generated by the EVP. When the sensor fails, the EVP cannot cause the necessary vacuum, resulting in the P258B code. Jeep owners must check and replace the sensor if needed to resolve this issue.

Brake Vacuum Booster

The Brake Vacuum Booster provides supplemental vacuum to the brake booster. When the booster fails, the EVP cannot generate the necessary vacuum, resulting in the P258B code. Jeep owners must check and replace the booster if needed to resolve this issue.

Brake Vacuum Booster Check Valve

The Brake Vacuum Booster Check Valve prevents backflow of the vacuum generated by the EVP. When the valve fails, the EVP cannot cause the necessary vacuum, resulting in the P258B code. To resolve this issue, Jeep owners must check and replace the valve if needed.

Electric Vacuum Pump

The Electric Vacuum Pump generates the vacuum necessary for the brake booster. When the pump fails, the EVP cannot cause the required vacuum, resulting in the P258B code. To resolve this issue, Jeep owners must check and replace the pump if needed.

Power Distribution Center

The Power Distribution Center is responsible for providing power to the EVP. When the center fails, the EVP will not receive the necessary power to function properly, leading to the generation of the P258B code. Jeep owners must check the center and replace it if needed to fix this issue.

Anti-Lock Brake System (ABS) Module

The ABS Module is responsible for controlling the operation of the EVP. When the module fails, the EVP will not receive the necessary signal to operate, resulting in the P258B code. Jeep owners must check and replace the module if needed to resolve this issue.

💥See also: Jeep Code P0507

Conclusion: Knowing How to Address Jeep Code P258B

Jeep owners may encounter the code P258B ‘Electric Vacuum Pump Performance’ when the Electric Vacuum Pump (EVP) system installed in their vehicles is not performing as intended. Fortunately, there are a variety of potential causes and solutions for the Jeep Code P258B. Understanding these causes and solutions is essential for Jeep owners, as it offers insight into addressing and resolving the issue quickly and effectively.