P0957 Fault Code

ASM Mode Circuit Low

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

The P0957 fault code indicates an issue with the ASM (Automatic Shift Management) mode circuit, primarily signaling that the voltage level from the ASM circuit is lower than expected. This can lead to improper shifting and other transmission-related problems.

What are the symptoms of the P0957 code?

Symptoms you may observe include:

• Harsh, delayed, or sudden shifts when changing gears.
• The vehicle may enter 'limp mode', restricting performance.
• Warning lights on the dashboard, such as the check engine light.
• Erratic transmission behavior or difficulty in shifting.
• Complete transmission failure in severe cases.

What causes the P0957 code?

Common causes for the P0957 fault code include:

• Damaged or corroded wiring or connectors in the ASM circuit.
• A faulty ASM sensor or component.
• Electrical shorts or open circuits within the transmission control system.
• Problems with the vehicle's transmission control module (TCM).

How to fix P0957?

To resolve the P0957 fault code, the following steps should be considered:

• Inspect the wiring and connectors for damage or corrosion, and repair or replace as needed.
• Test the ASM sensor and replace it if it is found to be malfunctioning.
• Clear any stored fault codes after repairs and perform a test drive to ensure the issue is resolved.
• If problems persist, further diagnostics of the TCM and associated circuits may be necessary.