P0699
Sensor Reference Voltage C Circuit High
P0699 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage C Circuit High. Common causes: short circuit of reference line c to power line, faulty sensor with internal short to power. Estimated repair cost: $11–889.
Symptoms
- Check Engine Light
- Inflated readings from group C sensors
- Unstable engine operation
- Multiple sensor error codes
- Malfunction of engine control systems
Causes
- Short circuit of reference line C to power line
- Faulty sensor with internal short to power
- Internal fault of the ECU reference voltage stabilizer
- Wiring damage
- Extraneous voltage in the sensor circuit of group C
How to Fix
- Read all OBD-II codes and record the complete list
- Measure the voltage on reference line C (norm: 5 V, tolerance ±0.2 V)
- Identify all sensors of group C according to the electrical diagram
- Turn off the sensors one by one and monitor the voltage change
- Repair short to power or replace faulty sensor
- If the external circuits are in good condition, replace the ECU
Related codes
Error P0699 by Vehicle Brand
FAQ
What does the P0699 code mean?
P0699 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage C Circuit High
What causes a P0699 error code?
The most common causes of P0699 include: Short circuit of reference line C to power line; Faulty sensor with internal short to power; Internal fault of the ECU reference voltage stabilizer; Wiring damage.
How do I fix a P0699 diagnostic trouble code?
To fix P0699: Read all OBD-II codes and record the complete list. Measure the voltage on reference line C (norm: 5 V, tolerance ±0.2 V). Identify all sensors of group C according to the electrical diagram. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0699?
Do not drive — repair immediately
How much does it cost to fix P0699?
The estimated repair cost for P0699 is $11–889. Actual cost depends on your vehicle, location, and labor rates.
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