Fault codeP0954

MODERATE

ASM Control Circuit Intermittent

What this code means

ASM Control Circuit Intermittent.

P0954 is a generic code: it means the same thing on every make. P0954 belongs to family P09xx — Transmission and controls. Its page explains how to read a code and groups all its codes by part.

Type of fault

The signal drops out or jumps from time to time. This is typical of a poor contact: a loose or corroded connector, or a chafed wire that touches intermittently, often triggered by vibration or heat. The fault may disappear and come back; checking the wiring with the engine running is often revealing.

Automated gearbox actuators

Automated manual gearboxes are manual gearboxes whose clutch and gear changes are operated by actuators, hydraulic or electric. Sensors measure the clutch position and the selector position, and the control unit learns these positions.

What you notice

Jerky starts, a slipping clutch, a gear that will not engage, a gearbox stuck in neutral.

How to check it

Check the hydraulic fluid level if the system uses one, the actuators' connectors and the battery voltage, since these gearboxes are sensitive to it. After any repair or a battery disconnection, a relearn of the positions with a suitable tool is often required.

What to do

Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.

Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →

How to read this code

PPowertrain
0standardised code
9Transmission and controls
54P0954