P0887 Fault Code

TCM Power Relay Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0887 fault code refers to a malfunction in the Transmission Control Module (TCM) Power Relay Control Circuit, specifically indicating that the control circuit is operating at a higher than expected voltage level. This issue can potentially disrupt the transmission's electronic functions, affecting overall vehicle performance.

What are the symptoms of the P0887 code?

When a P0887 code is present, you may experience one or more of the following symptoms:

• Transmission slipping or erratic shifting
• Delayed engagement when shifting from park to drive or reverse
• Transmission warning light illuminated on the dashboard
• Reduced fuel efficiency
• In some cases, the vehicle may enter 'limp' mode, restricting performance to prevent further damage.

What causes the P0887 code?

Several factors can lead to a P0887 code, including:

• Faulty TCM Power Relay
• Damaged wiring or connectors in the power relay circuit
• Short circuits or grounding issues within the circuit
• Malfunctioning Transmission Control Module (TCM) itself
• External electrical interference affecting the relay's operation.

How to fix P0887?

To resolve a P0887 fault code, follow these steps:

• Perform a detailed inspection of the TCM Power Relay and its circuit for any visible damage or corrosion.
• Use a multimeter to test the voltage and ensure it is within the manufacturer's specifications.
• Repair or replace any damaged wiring or connectors as necessary.
• If the relay itself is faulty, replacing it can often rectify the issue.
• If the problem persists, further diagnostics may be required to check the TCM for faults or failures.