AutoCodes – Toyota – P1551 2018 Toyota RAV4

P1551 2018 Toyota RAV4 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 (Built into the Generator Control ECU Assembly), 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 2018 Toyota RAV4 indicates Battery Current Sensor Circuit Low Input.
Common causes: Common causes include Faulty Battery Current Sensor (Built into the Generator Control ECU Assembly), 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 235

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 06, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1551 2018 Toyota RAV4 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 built into the Generator Control Reassembly detects the amount of charge/discharge current. The Generator Control ECU assembly sends voltage generation instructions to the generator assembly based on this signal. The Diagnostic Trouble Code (DTC) will be set when the battery current sensor output value is abnormally low for 30 seconds or more with the ignition switch ON.

OBDII Code P1551 2018 Toyota RAV4 - Battery Current Sensor Circuit Low Input - AutoCodes.com — P1551 2018 Toyota RAV4 Code - Battery Current Sensor Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P1551 2018 Toyota RAV4?

Faulty Battery Current Sensor (Built into the Generator Control ECU Assembly)
Battery Current Sensor harness is open or shorted
Battery Current Sensor circuit poor electrical connection

How to Fix the DTC P1551 2018 Toyota RAV4?

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 2018 Toyota RAV4 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 2018 Toyota RAV4 code?

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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.

Frequently Asked Questions about P1551 2018 Toyota RAV4 Code

1. What does the OBDII code P1551 mean on a 2018 Toyota RAV4?

P1551 indicates a "Battery Current Sensor Circuit Low Input," meaning the vehicle's computer has detected an abnormally low signal from the battery current sensor.

2. What are the symptoms of code P1551 in a 2018 Toyota RAV4?

Symptoms may include the check engine light turning on, erratic charging system behavior, issues with battery charging, or difficulty starting the vehicle.

3. What causes the P1551 code in a 2018 Toyota RAV4?

Common causes include a faulty battery current sensor, damaged or corroded wiring, loose electrical connections, or a defective ECM.

4. Can a bad battery trigger the P1551 code on a Toyota RAV4?

While the code specifically relates to the battery current sensor, a failing or weak battery can contribute to electrical issues and influence the sensor's readings.

5. How do you fix the P1551 code on a 2018 Toyota RAV4?

Repairs may involve replacing the battery current sensor, repairing or replacing damaged wiring, cleaning electrical connections, or reprogramming the ECM if necessary.

6. Where is the battery current sensor located on a 2018 Toyota RAV4?

The battery current sensor is typically mounted on the negative battery cable or near the battery terminal.

7. Can I drive my 2018 Toyota RAV4 with the P1551 code?

Driving with the P1551 code is not recommended, as it may lead to charging system issues and potential battery drain, leaving you stranded.

8. How much does it cost to fix the P1551 code on a Toyota RAV4?

Repair costs vary but typically range from $100 to $300, depending on whether the sensor needs replacement or if additional wiring repairs are required.

9. How do you diagnose the P1551 code on a 2018 Toyota RAV4?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the battery current sensor, checking wiring and connections, and testing the charging system.

10. Can a software update fix the P1551 code in a Toyota RAV4?

In rare cases, a software update or ECM reprogramming may resolve the issue if it stems from a programming error, but typically the problem is hardware-related.