P0698 Sensor Reference Voltage C Circuit Low 2

OBD-II Code: P0698

Description: Sensor Reference Voltage C Circuit Low 2

Definition: This code indicates that the powertrain control module (PCM) has detected a low voltage condition in the sensor reference voltage circuit designated as “C”. The PCM provides a reference voltage to various sensors, and if this voltage falls below a specified threshold, it triggers the P0698 code.

p0698 – Sensor Reference Voltage C Circuit Low

Typical severity: Moderate

Common Causes

P0698 – Sensor Reference Voltage C Circuit Low

• Open or short circuit in the wiring harness
• Faulty sensor reference voltage circuit
• Defective Engine Control Module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0698

Description: Sensor Reference Voltage C Circuit Low 2

Common Misdiagnosis: Replacing the sensor without checking the wiring or connectors for damage or corrosion.

 

Common Diagnostic Steps

OBD2 Code: P0698

Description: Sensor Reference Voltage C Circuit Low 2

• Check the vehicle’s battery voltage and charging system to ensure proper power supply.
• Inspect the wiring and connectors associated with the sensor reference voltage circuit for damage, corrosion, or disconnection.
• Test the sensor reference voltage at the ECM/PCM connector to verify it is within specifications.
• Examine related sensors that use the same reference voltage for faults or malfunctions.
• Use a scan tool to monitor live data and check for any additional trouble codes that may provide more context.
• If applicable, update or reflash the ECM/PCM software as per manufacturer recommendations.
• If all else fails, consider replacing the ECM/PCM if it is determined to be faulty after thorough diagnostics.