DTC P0121 Lincoln
Speedometer Circuit
Speedometer Circuit
Description
The IPC receives a serial data message from the ECM indicating that the vehicle speed is greater than 10 km h (6 mph). The ignition voltage is between 9-18 volts.
Cause and Solution
The IPC detects that the vehicle speed signal circuit does not match the vehicle speed from the serial data circuit.The condition above must be present for a minimum of 5 seconds.
Video Guide
Diagnostic Info
- DTC Code: P0121
- Brand: Lincoln