DTC Advanced Diagnostics: P0521
DTC P0521: Rocker Arm Oil Pressure Sensor Out of Range
General Description
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
| Execution | Continuous |
| Sequence | None |
| Duration | 6 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
The rocker arm oil pressure sensor output voltage [ROCKER ARM OIL PRESSURE SENSOR] is 0.46 V or less for at least 6 seconds.
[ ]: HDS Parameter
Possible Cause
- rRocker 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, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
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, the freeze data, and the on-board snapshot can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.