4E87

What the Code Means

4E87 logs an electrical fault in solenoid valve 4, which controls the shift-lock function — the mechanical lock on the automatic transmission selector. Normally this solenoid holds the lever in Park with the ignition off and releases it when the ignition is on. An open or short in the circuit keeps the solenoid from releasing the lock, and the lever stays stuck.

Symptoms

• Selector lever locked in Park, gears can't be changed;
• transmission fault indicator lamp on the instrument cluster;
• engine won't start.

Diagnosis and Repair

1. Check solenoid valve 4 resistance with a multimeter. Spec is 4–6 ohms. A reading outside that range means the solenoid is bad.
2. Inspect the wiring in the solenoid circuit for damage — opens, chafing, corroded contacts.
3. If solenoid resistance is out of spec, replace the valve.
4. Clear the codes and check shift-lock operation after the repair.

Secondary Problems

• If the solenoid fails, the lever can stay locked in Park — you'll need to release the lock manually or have the car towed.