P0953 Fault Code

ASM Control Circuit High

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

The P0953 fault code indicates a problem with the ASM (Automated Manual Transmission) control circuit, specifically a high voltage condition. This can lead to improper shifting or transmission performance issues. It's essential to address this issue to ensure smooth vehicle operation and prevent further damage to the transmission system.

What are the symptoms of the P0953 code?

You may experience several symptoms when encountering a P0953 fault code, such as:

• Harsh or erratic shifting of the transmission
• Transmission may go into 'limp mode', restricting performance
• Warning lights illuminated on the dashboard (e.g., check engine light)
• Difficulty in engaging gears, leading to potential stalling

What causes the P0953 code?

Potential causes of the P0953 fault code include:

• Damaged or corroded wiring in the ASM control circuit
• Faulty ASM control module or electronic control unit (ECU)
• Short circuits or open circuits within the transmission control system
• Defective sensors providing erroneous readings to the ECU
• Electrical issues, such as poor connections or ground faults

How to fix P0953?

To resolve the P0953 fault code, follow these steps:

• Inspect the ASM control circuit wiring for any signs of damage, wear, or corrosion.
• Test the voltage at the ASM control module to ensure it is within specifications.
• Check for any related fault codes and perform thorough diagnostics.
• If wiring and connections are intact, consider testing or replacing the ASM control module as needed.
• Clear the fault code using an OBD-II scanner and perform a road test to see if the issue reoccurs.