Nissan Altima P1550 Battery Current Sensor

Understanding DTC P1550 in Nissan: Causes, Diagnosis, and Solutions

Causes of DTC P1550 Nissan

1. Faulty Battery Current Sensor

The heart of the issue often lies with a faulty Battery Current Sensor. This sensor, attached to the battery cable at the negative terminal, measures the charging and discharging current of the battery.

2. Battery Current Sensor Harness Issues

Issues with the harness can also trigger the DTC P1550 code. This includes an open or shorted circuit in the Battery Current Sensor harness or poor electrical connections.

Diagnosis and Solutions

Visual Inspection and Checks

To identify the root cause, follow these steps:

  1. Visually inspect the related wiring harness and connectors for any damage.
  2. Check for broken, bent, pushed out, or corroded connector pins.

DTC P1550 Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

Understanding the P1550 Nissan Code

The power generation voltage variable control plays a crucial role in reducing fuel consumption by managing the engine load caused by the generator’s power generation. The Battery Current Sensor, installed on the battery cable, provides essential data to the Engine Control Module (ECM).

When the power generation voltage variable control is initiated, the ECM calculates the target power generation voltage based on the sensor signal. The calculated value is then sent as the power generation command value to the Intelligent Power Distribution Module Engine Room (IPDM E/R).

Cost of Diagnosing P1550 Nissan Code

The diagnosis typically requires 1.0 hour of labor. Keep in mind that labor rates vary depending on factors like location, vehicle make and model, and engine type. Auto repair shops generally charge between $75 and $150 per hour.

Specific Nissan Models Affected by P1550

For specific information related to your Nissan model, consult the following:

  • 2008 Nissan Altima Sedan
  • 2009 Nissan Altima Sedan
  • 2010 Nissan Altima Sedan
  • 2011 Nissan Altima Sedan
  • 2012 Nissan Altima Sedan
  • 2005-2012 Nissan Pathfinder

Nissan Altima 2007-2012 Service Manual Insights


The service manual provides in-depth insights into the power generation voltage variable control and the role of the Battery Current Sensor. It emphasizes the importance of avoiding direct connections to the battery terminal to prevent malfunctions.

DTC Logic

The article details the logic behind DTC P1550 detection, with a cautionary note about potential connections leading to battery discharge.

Diagnosis Procedure

  1. Check Ground Connection: Ensure the ground connection is intact.
  2. Check Battery Current Sensor Power Supply Circuit: Verify the voltage between the sensor harness connector and ground.
  3. Check Battery Current Sensor Ground Circuit: Examine the continuity between the sensor harness connector and ECM harness connector.
  4. Check Battery Current Sensor Input Signal Circuit: Confirm continuity and check for short circuits.
  5. Check Battery Current Sensor: Conduct a thorough inspection as per EC-380.

Leave a Reply

Your email address will not be published. Required fields are marked *