B1517 Battery Voltage Low or High

OBD2 Code: B1517

Description: Battery voltage low or high.

Definition: The B1517 code indicates that the vehicle’s onboard diagnostic system has detected a problem with the battery voltage being either too low or too high. This can affect the vehicle’s electrical systems and may lead to performance issues.

B1517 – Battery Voltage Low

Typical Severity: Moderate

B1518 – Battery Voltage High

Typical Severity: Moderate

Common Causes

B1517 – Battery Voltage Low or High

Common Causes:

• Faulty battery
• Loose or corroded battery connections
• Faulty alternator
• Short circuit in the charging system
• Excessive electrical load on the vehicle’s system

Common Misdiagnosis

OBD2 Code: B1517
Description: Battery Voltage Low or High
Common Misdiagnosis: Replacing the battery without checking for alternator issues or wiring problems.

Common Diagnostic Steps

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OBD2 Code: B1517 – Battery Voltage Low or High

Description: This code indicates that the battery voltage is either too low or too high.

Common Diagnostic Steps:

• Check the battery terminals for corrosion and ensure they are clean and tight.
• Measure the battery voltage with a multimeter. It should be around 12.6 volts when the engine is off and between 13.7 to 14.7 volts when running.
• Inspect the alternator belt for wear or looseness, as it can affect charging performance.
• Test the alternator output to ensure it is charging correctly.
• Examine all related fuses and relays for any signs of damage or failure.
• Inspect wiring harnesses connected to the battery and alternator for any signs of damage, fraying, or disconnection.
• If equipped, check for proper operation of any aftermarket electrical accessories that may draw excessive power from the system.

If these steps do not resolve the issue, further diagnosis by a professional technician may be required to identify more complex electrical problems within the vehicle’s charging system.