P0898 Fault Code

Transmission Control System MIL Request Circuit Low

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

The P0898 fault code refers to a problem in the Transmission Control System MIL Request Circuit Low. This code is often triggered when the Transmission Control Module (TCM) detects a voltage signal that is lower than expected from the malfunction indicator lamp (MIL) request circuit. This circuit is crucial for indicating when the transmission is experiencing issues, and any irregularities can lead to performance problems or unsafe driving conditions.

What are the symptoms of the P0898 code?

Symptoms associated with the P0898 fault code may include:

• Warning lights on the dashboard related to transmission or engine performance.
• Transmission may enter limp mode, limiting performance.
• Delayed or harsh shifting of the transmission.
• Reduced fuel efficiency due to transmission issues.
• Unusual noises or vibrations during vehicle operation.

What causes the P0898 code?

Common causes of the P0898 code include:

• Short circuits or open circuits in the MIL request circuit.
• Faulty transmission control module (TCM).
• Wiring issues such as corrosion or damage in the electrical connectors.
• Poor connections or grounding problems.
• Malfunctioning engine control module (ECM) affecting the TCM communication.

How to fix P0898?

To resolve the P0898 fault code, follow these steps:

• Inspect the MIL request circuit for any visible damage, shorts, or disconnections.
• Test the TCM for proper functionality and replace if found defective.
• Check all related wiring and connectors for corrosion or poor connections.
• Clear the fault codes after repairs and perform a test drive to ensure the issue is resolved.
• If the problem persists, consider checking the ECM and its compatibility with the TCM.