AutoCodes – Generic – P1551

P1551 Code - Battery Current Sensor Circuit Low Input

Quick Answer

The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the power generation of the generator. Common causes include Faulty Battery Current Sensor, Battery Current Sensor harness is open or shorted, Battery Current Sensor circuit poor electrical connection. 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, Battery Current Sensor harness is open or shorted, Battery Current Sensor circuit poor electrical connection.
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.

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Code Popularity 23,157

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1551 Description

The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the power generation of the generator. The battery current sensor is installed to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the battery. Based on the sensor signal, Engine Control Module (ECM) judges whether or not the power generation voltage variable control is performed. When performing the power generation voltage variable control, ECM calculates the target power generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation command value to IPDM E/R.

OBDII Code P1551 - Battery Current Sensor Circuit Low Input - AutoCodes.com — P1551 Code - Battery Current Sensor Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P1551?

Faulty Battery Current Sensor
Battery Current Sensor harness is open or shorted
Battery Current Sensor circuit poor electrical connection

How to Fix the DTC P1551?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1551 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1551 code?

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Need Help with the Code?

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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

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.