P0954 Fault Code

ASM Control Circuit Intermittent

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

The P0954 fault code indicates an intermittent issue with the ASM (Automatic Shifting Manual) control circuit. This can impact the shifting performance of the transmission and may hinder proper vehicle operation. Intermittent issues can make diagnosis challenging, as the problem may not be consistently present.

What are the symptoms of the P0954 code?

Symptoms associated with the P0954 fault code may include:

• Erratic shifting behavior or delays in gear changes.
• Check Engine Light (CEL) illumination.
• Transmission entering limp mode to prevent further damage.
• Unusual noises during shifting or operation.
• Difficulty in selecting gears or an inability to shift manually.

What causes the P0954 code?

Common causes for the P0954 code can include:

• Loose or damaged wiring in the ASM control circuit.
• Faulty ASM control module.
• Corroded connectors or terminals affecting electrical continuity.
• A malfunctioning transmission component that interacts with the ASM system.
• Software issues within the transmission control module (TCM).

How to fix P0954?

To resolve the P0954 code, consider the following steps:

• Inspect the wiring and connectors for any signs of damage or corrosion, and repair as necessary.
• Use a multimeter to test for proper voltage and continuity in the ASM control circuit.
• Replace any faulty components in the ASM system, including the control module if needed.
• Update the TCM software if applicable, or reset the system to check if the error persists.
• Clear the fault code and conduct a test drive to ensure the problem is resolved.