AutoCodes – Lexus – P1550 Lexus

P1550 Lexus Code - Battery Current Sensor Circuit Range/Performance

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
P1550 Lexus indicates Battery Current Sensor Circuit Range/Performance.
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 8,124
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Apr 06, 2024
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Code P1550 Lexus 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 ECU assembly 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 difference between the maximum and minimum current values of the battery current sensor is less than 1 A for 10 seconds or more with the ignition switch ON.
OBDII Code P1550 Lexus - Battery Current Sensor Circuit Range/Performance - AutoCodes.com
P1550 Lexus Code - Battery Current Sensor Circuit Range/Performance

What are the Possible Causes of the DTC P1550 Lexus?

  • 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 P1550 Lexus?

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 P1550 Lexus 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 P1550 Lexus code?

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Need Help with the 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 P1550 Lexus Code

1. What does the OBDII code P1550 mean for a Lexus?

P1550 indicates a problem with the Battery Current Sensor Circuit, specifically its range or performance.

2. What are common symptoms of the P1550 code on a Lexus?

Symptoms may include poor battery charging, erratic voltage readings, illuminated warning lights, or difficulty starting the vehicle.

3. What causes the P1550 code to appear on a Lexus?

Common causes include a faulty battery current sensor, damaged wiring or connectors, or a malfunctioning alternator.

4. Can a weak battery trigger the P1550 code?

Yes, a weak or failing battery can cause abnormal readings from the battery current sensor, resulting in the P1550 code.

5. How can I diagnose the P1550 code on a Lexus?

Use a diagnostic scanner to confirm the code, visually inspect the battery current sensor and wiring, and test the alternator and battery performance.

6. Is the P1550 code dangerous to drive with?

Driving with the P1550 code may lead to battery charging issues, impacting vehicle performance or causing unexpected breakdowns.

7. How do I fix the P1550 code on a Lexus?

Repairs may involve replacing the battery current sensor, repairing damaged wiring, or addressing alternator or battery issues.

8. How much does it cost to repair the P1550 code on a Lexus?

Repair costs vary depending on the exact issue but may range from $150 to $500, depending on parts and labor.

9. Can I reset the P1550 code without fixing the problem?

While you can clear the code temporarily with a scanner, the underlying issue must be resolved to prevent the code from reappearing.

10. Does the P1550 code affect fuel efficiency?

Indirectly, yes. Improper battery charging may cause electrical system inefficiencies, potentially impacting fuel consumption.

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