PSFA_a251 — Lateral Control Failed

Full alert identifier: PSFA_a251_lateralControlFailed

Alert description

Steering system unable to follow commands due to one or more conditions affecting functionality.

Potential impact

Vehicle is unable to drive or continue driving.

Set condition

Any condition affecting steering system functionality that will prevent operation / make the steering system unable to follow commands.

Clear condition

All conditions making steering system unable to respond to commands are resolved, and a new drive cycle starts.

Signals to check

These diagnostic fields are associated with PSFA_a251. Check the alert's Alert Log in Service Mode Plus for available values.

Signal	Unit
Communication Force Delegation Rx `PSFA_a251_communicationForceDelegationRx`	—
Communication Steering Command Rx `PSFA_a251_communicationSteeringCommandRx`	—
Communication Torque Delegation Rx `PSFA_a251_communicationTorqueDelegationRx`	—
Feedback Primary `PSFA_a251_feedbackPrimary`	—
Feedback Secondary `PSFA_a251_feedbackSecondary`	—
Handwheel Health `PSFA_a251_handwheelHealth` 0 FAULT 1 DEGRADED SECONDARY 2 DEGRADED PRIMARY 3 DEGRADED NO LV 4 HEALTHY	—
Handwheel Lv Redundancy Okay `PSFA_a251_handwheelLvRedundancyOkay`	—
Handwheel Torque Output Primary `PSFA_a251_handwheelTorqueOutputPrimary`	—

Show 24 more fields

Signal	Unit
Handwheel Torque Output Secondary `PSFA_a251_handwheelTorqueOutputSecondary`	—
Rack Center Known Primary `PSFA_a251_rackCenterKnownPrimary`	—
Rack Center Known Secondary `PSFA_a251_rackCenterKnownSecondary`	—
Rack Control Primary `PSFA_a251_rackControlPrimary`	—
Rack Control Secondary `PSFA_a251_rackControlSecondary`	—
Rack Force Output Primary `PSFA_a251_rackForceOutputPrimary`	—
Rack Force Output Secondary `PSFA_a251_rackForceOutputSecondary`	—
Rack Lv Redundancy Okay `PSFA_a251_rackLvRedundancyOkay`	—
Redundancy Healthy PEPS `PSFA_a251_redundancyHealthyPEPS`	—
Redundancy Healthy PSFA `PSFA_a251_redundancyHealthyPSFA`	—
Redundancy Healthy SEPS `PSFA_a251_redundancyHealthySEPS`	—
Roadwheel Health `PSFA_a251_roadwheelHealth` 0 FAULT 1 DEGRADED SECONDARY 2 DEGRADED PRIMARY 3 DEGRADED NO LV 4 HEALTHY	—
Roadwheel Healthy `PSFA_a251_roadwheelHealthy`	—
Steering Command Autopilot Primary `PSFA_a251_steeringCommandAutopilotPrimary`	—
Steering Command Autopilot Secondary `PSFA_a251_steeringCommandAutopilotSecondary`	—
Steering Command Primary `PSFA_a251_steeringCommandPrimary`	—
Steering Command Secondary `PSFA_a251_steeringCommandSecondary`	—
System State `PSFA_a251_systemState`	—
Vehicle Estimates PEPS `PSFA_a251_vehicleEstimatesPEPS`	—
Vehicle Estimates PSFA `PSFA_a251_vehicleEstimatesPSFA`	—
Vehicle In Motion `PSFA_a251_vehicleInMotion`	—
Vehicle Speed PEPS `PSFA_a251_vehicleSpeedPEPS`	—
Vehicle Speed PSFA `PSFA_a251_vehicleSpeedPSFA`	—
Vehicle Speed SEPS `PSFA_a251_vehicleSpeedSEPS`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of PSFA_a251.