Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0522, P0523 (K20C1) (2017 2018 2019)
DTC P0522: Rocker Arm Oil Pressure Sensor Circuit Low Voltage
DTC P0523: Rocker Arm Oil Pressure Sensor Circuit High Voltage
General Description
The rocker arm oil pressure sensor detects engine oil pressure in the system. When the voltage from the rocker arm oil pressure sensor is a set value for a specified time, the powertrain control module (PCM) detects a malfunction and stores a DTC
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 0.5 second or more |
| DTC Type | Two drive cycles, MIL off |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
DTC: P0522
The rocker arm oil pressure sensor output voltage [Rocker Arm Oil Pressure Sensor] is under 0 V for at least 0.5 second.
DTC: P0523
The rocker arm oil pressure sensor output voltage [Rocker Arm Oil Pressure Sensor] is over 5 V for at least 0.5 second.
[ ]: HDS Parameter
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P0522
- Rocker arm oil pressure sensor OPSEN line short to ground
- Rocker arm oil pressure sensor VCC line open
DTC: P0523
- Rocker arm oil pressure sensor OPSEN line open
- Rocker arm oil pressure sensor SG line open
Common
- Rocker arm oil pressure sensor failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.