SCP
Your vehicle's Secondary Clutch Pressure (SCP) system isn't maintaining proper hydraulic pressure, similar to a water pump failing to build adequate pressure in a cooling system. The transmission control module detected that the clutch pressure is either too low or unstable during operation.
The ECM monitors hydraulic pressure in the secondary clutch circuit via a pressure sensor during gear changes. It compares actual pressure against expected values based on throttle position, gear demand, and engine load. A failure occurs when measured pressure deviates significantly from the calibrated threshold during clutch apply events.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Secondary Clutch Pressure | 150-350 PSI during engagement | Below 100 PSI or unable to reach target during shift |
| Pressure Response Time | Builds within 200-500ms of command | Delayed response or no pressure rise |
Code P1487 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1487 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.