P1551 Code - Battery Current Sensor Circuit Low Input
Quick Answer
The P1551 code indicates a problem with the battery current sensor circuit, specifically a low input signal. Common causes include Faulty Battery Current Sensor: The sensor itself may be faulty and not providing accurate readings, Damaged Wiring: Wiring or connectors in the sensor circuit may be damaged or corroded, leading to a weak connection, Weak Battery: A weak or failing battery can also trigger the P1551 code, as it may not be able to hold a charge properly. 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
- P1551 indicates Battery Current Sensor Circuit Low Input.
- Common causes
- Common causes include Faulty Battery Current Sensor: The sensor itself may be faulty and not providing accurate readings, Damaged Wiring: Wiring or connectors in the sensor circuit may be damaged or corroded, leading to a weak connection, Weak Battery: A weak or failing battery can also trigger the P1551 code, as it may not be able to hold a charge properly.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1551 Description
The P1551 code indicates a problem with the battery current sensor circuit, specifically a low input signal. The battery current sensor is responsible for monitoring the flow of electrical current into and out of the battery. When the sensor detects a low input signal, it means that the current flowing into the battery is lower than expected, which can indicate issues with the charging system or battery health.
Common Causes of P1551
- Faulty Battery Current Sensor: The sensor itself may be faulty and not providing accurate readings.
- Damaged Wiring: Wiring or connectors in the sensor circuit may be damaged or corroded, leading to a weak connection.
- Weak Battery: A weak or failing battery can also trigger the P1551 code, as it may not be able to hold a charge properly.
- Charging System Issues: Problems with the vehicle's charging system, such as a failing alternator, can also contribute to this code.
Symptoms of P1551
- Check Engine Light: The most obvious symptom of the P1551 code is the illumination of the check engine light on the dashboard.
- Poor Fuel Efficiency: A malfunctioning battery current sensor can lead to inaccurate charging of the battery, resulting in poor fuel efficiency.
- Difficulty Starting: If the battery is not receiving the correct amount of charge, it may struggle to start the engine.
- Electrical Issues: Problems with the battery current sensor can cause issues with the vehicle's electrical system, such as dim lights or malfunctioning accessories.
How to Fix P1551
- Diagnose the Issue: Use a diagnostic tool to read the code and determine the exact cause of the problem.
- Inspect Wiring and Connectors: Check for any damaged or corroded wiring and connectors in the battery current sensor circuit.
- Test the Battery: Verify the health of the battery to ensure it is holding a charge properly.
- Replace the Battery Current Sensor: If the sensor is faulty, it will need to be replaced with a new one.
- Check the Charging System: Inspect the alternator and other components of the charging system to ensure they are functioning correctly.
Cost to Fix P1551
The cost of repairing a P1551 code can vary depending on the specific cause of the issue. In general, the cost of replacing a battery current sensor can range from $100 to $300, including parts and labor. If additional repairs are needed for the charging system or battery, the total cost can increase. It's important to factor in diagnostic time and labor rates, which can vary but typically range from $80 to $150 per hour at most auto repair shops. Be sure to get a detailed estimate from a qualified mechanic before proceeding with any repairs.
Need more information about the P1551 code?
Need more information on how to fix the P1551 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1551 code diagnosed by a professional: Find a repair shop in your area
Code P1551 Information for Specific Makes
- P1551 Audi — Barometric Pressure Sensor Circuit Short to B+
- P1551 BMW — Camshaft Position Actuator 'A' Control Open Circuit Bank 1
- P1551 Infiniti — Battery Current Sensor Circuit Low Input
- P1551 Land Rover — Idle Air Control Valve Closing Circuit
- P1551 Lexus — Battery Current Sensor Circuit Low Input
- P1551 MINI — Camshaft Position Actuator 'A' Control Open Circuit Bank 1
- P1551 Nissan — Battery Current Sensor Circuit Low Input
- P1551 Scion — Battery Current Sensor Circuit Low Input
- P1551 Suzuki — Throttle Valve Rest Position Not Reached During Learn
- P1551 Toyota — Battery Current Sensor Circuit Low Input
- P1551 Volkswagen — Barometric Pressure Sensor Circuit Short to B+
- P1551 Volvo — Vehicle Speed Signal
Frequently Asked Questions about P1551 Code
No Frequently Asked Questions about P1551 Code found.
Discuss the causes and fixes for P1551 OBDII Code
Code P1551 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.