P0951 Fault Code

ASM Control Circuit Range/Performance

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

The P0951 fault code indicates a problem with the ASM (Automatic Shifter Module) control circuit, which is responsible for the proper functioning of the automatic transmission system in a vehicle. When this code is triggered, it signifies that the ASM control circuit is experiencing range or performance issues, potentially affecting the vehicle's ability to shift gears smoothly. This can lead to a range of driving complications if not addressed promptly.

What are the symptoms of the P0951 code?

Symptoms associated with the P0951 error code can manifest as:

• Difficulty in shifting gears or slipping transmission
• Warning lights illuminated on the dashboard, such as the check engine light
• Unusual noises during shifting or operation of the transmission
• Vehicle may enter 'limp mode' to prevent further damage
• Potential increase in fuel consumption and reduced acceleration performance

What causes the P0951 code?

Common causes of a P0951 fault code include:

• Faulty ASM control module or wiring
• Poor connections or corroded terminals in the circuit
• Malfunctioning transmission range sensor
• Issues with the vehicle's battery or electrical system affecting the control circuit
• Software glitches within the engine control unit (ECU)

How to fix P0951?

To resolve the P0951 fault code, follow these steps:

• Inspect and repair any damaged wiring or connectors related to the ASM control circuit.
• Test the transmission range sensor for proper operation and replace if needed.
• Check for voltage and grounding issues within the circuit.
• Update or reprogram the engine control unit (ECU) software if applicable.
• Clear the fault code and perform a test drive to ensure the issue is resolved.