P0885 Fault Code

TCM Power Relay Control Circuit /Open

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

The P0885 fault code indicates an issue with the TCM (Transmission Control Module) Power Relay Control Circuit. This code typically signals a problem with the electrical circuit responsible for powering the TCM, which can result in various transmission-related issues.

• The TCM plays a crucial role in managing the vehicle's transmission system, determining the appropriate shifting points based on driving conditions.
• A malfunction in the power relay can lead to a loss of power to the TCM, resulting in performance degradation or complete failure of the transmission system.
• Understanding this code is essential for diagnosing potential problems within the transmission control circuit.

What are the symptoms of the P0885 code?

Drivers may experience the following symptoms when the P0885 code is triggered:

• Difficulty in shifting gears or abnormal shifting patterns.
• The check engine light being illuminated on the dashboard.
• Transmission slipping or failing to engage properly.
• Unresponsive or erratic transmission behavior, especially under load.
• Potential vehicle stalling or failing to start due to the control circuit malfunction.

What causes the P0885 code?

Several factors can contribute to the occurrence of the P0885 code, including:

• A faulty TCM power relay that is incapable of supplying power.
• Damaged wiring or poor connections in the power relay control circuit.
• A defective TCM that may internally fail, causing a disruption in the power relay operation.
• Corrosion or dirt buildup in connectors, preventing normal electrical flow.

How to fix P0885?

To resolve the P0885 code, consider the following steps:

• Inspect the TCM power relay for evidence of failure; replace it if necessary.
• Check the wiring and connectors in the TCM power relay circuit for damage, corrosion, or loose connections; repair or replace as needed.
• Test the TCM's functionality to ensure it operates correctly; if faulty, replacement may be required.
• Clear the fault code from the vehicle's computer system and monitor for reoccurrence during a test drive.