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 P0523
DTC P0523:Â Rocker Arm Oil Pressure Sensor Circuit High Voltage
General DescriptionÂ
The rocker arm oil pressure sensor detects engine oil pressure in the valve pause 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, OBD StatusÂ
| Execution | Continuous |
| Sequence | None |
| Duration | 2.0 seconds or more |
| DTC Type | One drive cycle, MIL on |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
Enable ConditionsÂ
| Condition | Minimum | Maximum |
|---|---|---|
| Engine coolant temperature [ECT SENSOR 1] | 104 deg. F (40 deg. C) | - |
| Engine speed[ENGINE SPEED] | - | 6, 000 rpm |
| No active DTCs set (prevents monitor from running) | P0117, P0118, P0522 | |
[ ]: HDS Parameter
Malfunction ThresholdÂ
The rocker arm oil pressure sensor output voltage [ROCKER ARM OIL PRESSURE SENSOR] is 4.79 V or more for at least 2.0 seconds.
Possible CauseÂ
NOTE:Â The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Rocker arm oil pressure sensor POIL line open
- Rocker arm oil pressure sensor SG line open
- Rocker arm oil pressure sensor failure
- PCM internal circuit failure
Diagnosis DetailsÂ
Conditions for setting the DTCÂ
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.
Conditions for clearing the DTCÂ
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.
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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.