The P0699: Sensor Reference Voltage ‘C’ Circuit High code indicates that the control module has detected a higher-than-expected voltage in the sensor reference voltage ‘C’ circuit. This circuit provides a stable voltage reference to various sensors in the vehicle, ensuring their proper operation. A high voltage condition can cause sensors to malfunction, leading to inaccurate data being sent to the control module. This issue could result from a faulty sensor, wiring problems, or a malfunction in the control circuit.
P0699 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0699: Sensor Reference Voltage ‘C’ Circuit High |
| Is it serious? | Yes, as it can cause sensors to send incorrect data, affecting vehicle performance. |
| Possible causes | – High voltage in sensor reference voltage ‘C’ circuit – Faulty sensor – Wiring issue |
| How to diagnose? | – Test sensor reference voltage ‘C’ circuit for voltage – Inspect wiring and connectors – Replace sensor if necessary |
P0699 Meaning
The P0699 code indicates that the voltage in the sensor reference voltage ‘C’ circuit is higher than expected. This high voltage can affect the performance of the sensors relying on this reference voltage, leading to inaccurate readings and potential vehicle performance issues.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the sensors or electrical system that may provide more information about the issue. | OBD-II Scanner |
| Test the Sensor Reference Voltage ‘C’ Circuit for Voltage | Use a multimeter to measure the voltage in the sensor reference voltage ‘C’ circuit. Compare the voltage readings with manufacturer specifications to determine if the voltage is too high. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors in the sensor reference voltage ‘C’ circuit for signs of damage, corrosion, or loose connections that could cause high voltage. | Flashlight, Multimeter |
| Test the Sensors | Test the sensors using the reference voltage ‘C’ circuit to ensure they are functioning correctly and receiving the proper voltage. Replace any faulty sensors. | Diagnostic Tool, Multimeter |
| Replace the Sensor if Necessary | If one of the sensors in the sensor reference voltage ‘C’ circuit is faulty, replace it to restore proper operation. | Replacement Sensor, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure that the sensor reference voltage ‘C’ circuit is functioning correctly. | OBD-II Scanner, Vehicle Manual |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko