Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a part of the car's computer system is getting too much power, which can cause problems with how the car runs.
The Electronic Control Module (ECM) is detecting a higher than expected voltage level in the Sensor Supply B circuit.
The P1574 code indicates that the ECM has detected a voltage level above the specified limit for the Sensor Supply B circuit. This could be due to a short to voltage, a faulty sensor, or an ECM issue. The ECM uses this sensor supply to power various sensors, and an incorrect voltage can lead to inaccurate sensor readings.
• Check Engine Light is on
• Poor engine performance
• Erratic vehicle behavior
• Short to voltage in the Sensor Supply B circuit
• Faulty sensor drawing excessive power
• Defective ECM
ECM: Electronic Control Module
OBD-II: On-Board Diagnostics II
• Use a multimeter to check the voltage in the Sensor Supply B circuit.
• Inspect the wiring and connectors for damage or corrosion.
• Test the sensors connected to the Sensor Supply B circuit for faults.
• Repair or replace damaged wiring or connectors.
• Replace faulty sensors.
• Replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $1000 depending on the specific issue
Moderate
• Nissan Altima
• Infiniti G35
• Chevrolet Silverado
• Regularly inspect and maintain vehicle wiring.
• Ensure sensors are functioning properly.
• Avoid exposure of electronic components to moisture.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid driving the vehicle if it shows signs of erratic behavior.
Check with your vehicle manufacturer for warranty coverage on ECM and sensors.
This code has been reported in various models due to wiring issues and faulty sensors.
Moderate – It should be addressed soon to prevent further issues.
Driving with a malfunctioning ECM can lead to unsafe driving conditions.
• Engine running
• Sensors connected
The ECM is typically located in the engine compartment or under the dashboard.
Q: Can I drive with a P1574 code?
A: It's not recommended to drive with this code, as it can lead to engine performance issues.
Q: How do I clear a P1574 code?
A: After fixing the issue, use an OBD-II scanner to clear the code.
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