P0697 Fault Code

Sensor Reference Voltage C Circuit / Open

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

The P0697 fault code indicates an issue with the reference voltage for the sensor circuit, specifically that there is an open circuit or malfunction in the wiring. This typically means that the Engine Control Module (ECM) is unable to detect the sensor's signal due to a lack of voltage, resulting in potential performance issues.

What are the symptoms of the P0697 code?

• Illuminated check engine light on the dashboard.
• Possible decrease in engine performance or efficiency.
• Erratic operation of vehicle systems that rely on sensor feedback.
• Incorrect readings from other sensors that depend on the reference voltage.

What causes the P0697 code?

• Damaged wiring or connectors in the reference voltage circuit.
• Failed sensor responsible for providing feedback to the ECM.
• Malfunction within the ECM itself.
• Poor ground connections or corroded terminals affecting the voltage supply.

How to fix P0697?

• Inspect the wiring and connectors for any visible damage or corrosion, repairing as necessary.
• Test the sensor’s functionality and replace it if found faulty.
• Check and clean ground connections to ensure proper voltage supply.
• If wiring and sensors are in good condition, consider testing or replacing the ECM.