The P0699 OBD-II code refers to a problem with the sensor reference voltage circuit, specifically the “C” circuit. This code indicates that the engine control module (PCM) has detected a high voltage condition in this circuit, which can affect various engine sensors that rely on a steady 5-volt reference signal.
What Does the P0699 Code Mean?
When the P0699 code is triggered, it means that the PCM has identified an issue with the sensor reference voltage “C” circuit. The PCM sends out a standard 5-volt reference signal to engine sensors, and a high voltage in this circuit suggests that there is a malfunction that needs to be addressed.
What Causes the P0699 Code?
- Engine sensor failure
- Powertrain Control Module (PCM) failure
- Wiring issues or short circuits in the sensor reference circuit
What Are the Symptoms of the P0699 Code?
- Engine may not start
- Illuminated check engine light
How Serious Is the P0699 Code?
The severity of the P0699 code is considered moderate. While it might not pose an immediate threat to your vehicle’s safety or functionality, it is advisable to get it diagnosed and repaired within a reasonable timeframe to prevent further complications.
How to Diagnose the P0699 Code
To accurately diagnose the P0699 code, a professional mechanic will typically perform the following steps:
- Use an OBD-II scanner to confirm the presence of the P0699 code and check for any related codes.
- Inspect the wiring and connectors associated with the sensor reference voltage circuit.
- Test the voltage output from the PCM to ensure it is within specifications.
- Check the functionality of the engine sensors that utilize the reference voltage.
Common Repairs for the P0699 Code
Common repairs to resolve the P0699 code may include:
- Repairing or replacing damaged wiring or connectors in the reference voltage circuit.
- Replacing faulty engine sensors.
- Replacing or reprogramming the Powertrain Control Module (PCM) if it is found to be defective.
How Much Does It Cost to Fix the P0699 Code?
The cost of fixing the P0699 code can vary widely depending on the underlying cause. Simple wiring repairs may cost under $100, while replacing a PCM can cost several hundred dollars, including parts and labor.
Can I Fix the P0699 Code Myself?
If you have some automotive repair experience and access to the necessary tools, you may be able to diagnose and repair minor issues related to the P0699 code, such as inspecting wiring and connectors. However, for more complex problems, especially those involving the PCM or engine sensors, it’s best to consult a professional mechanic.
