P0955 Fault Code

ASM Mode Circuit [Perf / Winter / Sport / etc]

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

• The P0955 fault code relates to issues with the ASM (Automated Sports Mode) circuit in your vehicle. This can affect various driving modes such as performance, winter, or sport depending on the specific vehicle configuration.
• The ASM system is designed to optimize vehicle performance based on the selected driving mode, adjusting parameters like throttle response and transmission settings for an enhanced driving experience.

What are the symptoms of the P0955 code?

• Symptoms that may accompany the P0955 code can include:
  • Check Engine Light illuminated on the dashboard
  • Inability to switch between driving modes smoothly
  • Poor acceleration or unusual transmission behavior
  • Transmission slipping or harsh shifting
  • Unexpected engine performance impacts or reduced fuel efficiency

What causes the P0955 code?

• Common causes of the P0955 code include:
  • Faulty ASM switch or sensor
  • Wiring issues or short circuits in the ASM circuit
  • Defective transmission control module (TCM)
  • Low transmission fluid levels or poor fluid quality
  • Software glitches in the vehicle's control system

How to fix P0955?

• To resolve the P0955 fault code, consider the following steps:
  • Inspect and test the ASM switch and associated wiring for damage or faults.
  • Check transmission fluid levels and condition; replace fluid if necessary.
  • Scan the vehicle for additional fault codes that may provide insight into the issue.
  • Clear the codes and test drive the vehicle to see if the problem persists; if it does, further diagnostic testing may be required.
  • In some cases, updating the vehicle's software may rectify the issue.