P0653 Fault Code

Sensor Reference Voltage B Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0653 fault code indicates an issue with the Sensor Reference Voltage B Circuit, specifically that the circuit is reading a high voltage. This could mean that there is a problem with the circuit itself, a sensor that is connected to it, or the engine control module (ECM) that monitors the circuit. The reference voltage provides a baseline signal for various sensors, and an abnormal reading can impact the performance of these sensors and the overall operation of the vehicle.

What are the symptoms of the P0653 code?

When the P0653 code is triggered, you may notice:

• Warning lights on the dashboard, often the check engine light.
• Poor engine performance or erratic behavior of the vehicle.
• Increased fuel consumption due to misreading sensor values.
• Difficulty in starting the vehicle or stalling.

What causes the P0653 code?

The high voltage in the Sensor Reference Voltage B Circuit can be caused by several factors:

• A short circuit in the wiring or connectors leading to the sensor.
• A fault in the sensor itself that is causing it to send incorrect readings.
• A failure or malfunction in the ECM which may be providing incorrect reference voltage.
• Corroded or loose connections that lead to inconsistent voltage readings.

How to fix P0653?

To resolve the P0653 fault code, follow these steps:

1. Inspect the wiring and connectors related to Sensor B for any signs of damage, corrosion, or loose connections and repair as necessary.
2. Test the sensor associated with the circuit for functionality and replace it if it's found to be defective.
3. Use a multimeter to check the voltage output from the ECM to ensure it is providing the correct reference voltage.
4. If everything checks out, a software update or reprogramming of the ECM may be required to ensure proper functioning.