P1550 - FAULT CODE - OBD2

P1550 Code failures by brands

P1550 INFINITI, LEXUS, NISSAN, SCION, TOYOTA: BATTERY CURRENT SENSOR CIRCUIT RANGE/PERFORMANCE

Description of DTC code P1550

The variable voltage control of power generation decreases fuel consumption. To do this, it reduces the engine load resulting from the power output of the generator.

The Battery Current Sensor is placed on the battery cable, specifically on the negative terminal. It measures the charge and discharge of the battery. Regarding the signal from this sensor, the ECM (Engine Control Module) can determine whether or not to perform the variable power generation control. Therefore, the ECM calculates the target power generation voltage, taking into account the sensor signal. The ECM in response sends the calculated value as the value of power generation command to IPDM E/R.

The OBDII fault code P1550 is stored by the ECM when range problems are detected in the Battery Current Sensor circuit. The voltages received from the Battery Current Sensor do not match the allowable parameters.

Symptoms of fault code P1550

The Check Engine light turns on.

Causes of OBD2 P1550

Reasons to set the P1550 OBD2 DTC:

The Battery Current Sensor circuit wires or connectors may be damaged.
The Battery current sensor may have poor electrical connections, causing an open or short circuit.
The Battery Current Sensor may be faulty.

Possible solutions of the DTC code P1550

To troubleshoot the P1550 OBDII diagnostic code, try this:

Consult the Technical Service Bulletins.
Check the wiring and connectors belonging to the Battery Current Sensor circuit for common deficiencies such as burns, wear, or corrosion. Make repairs as necessary.
Take readings of the battery current sensor circuit voltages and check that they match the manufacturer's specifications. If you find an out-of-range voltage, make corrections.
Check the integrity of the Battery Current Sensor. Follow the manufacturer's recommendations to diagnose the sensor. If you determine it is in poor condition, replace it.