Conditions Which Generate This Code:
The ECM detects the following conditions:
• The vehicle speed signal changes more than 5 MPH on eight consecutive readings in three
• The engine speed is greater than the programmed “VSL Protection” minus 100 rpm.
• The “VSL Protection” parameter is programmed to a value that is less than 2120 rpm.
Note: If the ABS is the source of the vehicle speed, the ABS must not be active.
“DIAG” will be displayed next to the status for “Vehicle Speed” on the electronic service tool. The check engine lamp will illuminate.
Possible Performance Effect:
Engine rpm is limited to the programmed “VSL Protection” for eight seconds.
Perform the following diagnostic procedure: “Vehicle Speed and Speedometer Circuit – Test”
• OK – STOP.