P0699 Fault Code

Sensor Reference Voltage C Circuit High

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

The P0699 fault code indicates an issue with the Reference Voltage C Circuit. This sensor is responsible for providing a stable voltage level to various engine components, ensuring proper operation. When the circuit detects a high voltage condition, it triggers this fault code.

What are the symptoms of the P0699 code?

Common symptoms associated with the P0699 code may include:

• Malfunction Indicator Lamp (MIL) illuminated on the dashboard.
• Poor engine performance or irregular engine behavior.
• Reduced fuel efficiency due to engine management issues.
• Potential stalling or difficulty starting the engine.

What causes the P0699 code?

Possible causes for a P0699 code may include:

• Short circuit in the wiring harness related to the reference voltage C.
• Faulty sensors that are drawing too much voltage.
• Open circuit or damaged wiring that leads to excess voltage.
• Issues with the Engine Control Module (ECM) or Powertrain Control Module (PCM).

How to fix P0699?

To resolve the P0699 fault code, take the following steps:

1. Inspect the wiring and connectors related to the sensor for any visible damage or corrosion.
2. Use a multimeter to test the voltage at the reference voltage C circuit to confirm if it is higher than expected.
3. Remove and test the sensors connected to the circuit for faults; replace any defective parts.
4. Check the ECM/PCM functionality and reprogram or replace if necessary.
5. Clear any fault codes and perform a test drive to ensure the issue is resolved.