Encountering the P287A diagnostic trouble code on your Ford Focus indicates an issue within the transmission control system, specifically related to clutch "B" performance. Ignoring this can lead to transmission slippage or failure. Follow these targeted steps to diagnose:
Primary Causes & Immediate Checks
- Low/Fouled Transmission Fluid: Check fluid level and condition using the dipstick. Look for burning smell or metallic particles.
- Faulty Solenoids: Inspect shift solenoid "B" (SSB) electrical connectors for corrosion or damage. Test resistance with a multimeter (typically 15-20 Ohms).
- Worn Clutch Components: Listen for grinding noises during gear shifts, indicating mechanical wear.
- TCM/PCM Software Glitches: Recent battery disconnections or software updates may corrupt module programming.
Critical Troubleshooting Protocol
- Read freeze frame data via OBD-II scanner to identify RPM/load conditions triggering the code.
- Perform clutch adaptive learning reset using Ford IDS or compatible scan tool.
- Pressure-test transmission hydraulic circuits. Specification range: 55-85 PSI at idle.
- Road-test while monitoring solenoid activation percentages and clutch slip RPM delta (over 250 RPM indicates failure).
Recommended Interventions
- DIY-Friendly: Fluid flush with Motorcraft Mercon LV fluid (double-check fill procedure). Replace solenoid if resistance tests abnormal.
- Shop Required: Internal clutch inspection (requires transmission removal), TCM reprogramming via Ford FDRS system, or wiring harness repair.
Pro Tip: Never drive with illuminated transmission warnings. Have professional diagnostics if basic checks don't resolve P287A—incorrect repairs risk cascading transmission damage.