VSA DTC 25-21, 26-21, 28-21, 28-22

DTC 25-21  : Yaw Rate Sensor Output Signal Malfunction

DTC 26-21  : Lateral Acceleration Sensor Output Signal Malfunction

DTC 28-21  : Longitudinal Acceleration Sensor Output Signal Malfunction

DTC 28-22  : Longitudinal Acceleration Sensor Stuck

NOTE: 

• Before you troubleshoot, review the how to troubleshoot the VSA system - Refer to:

  How to Troubleshoot the VSA System (2014 2015 2016) or

  How to Troubleshoot the VSA System (2017 2018 2019 2020) .

• The yaw rate-acceleration sensor is built into the VSA modulator-control unit.
• Before troubleshooting, check the VSA modulator-control unit for proper mounting. If not properly installed the VSA modulator-control unit may set these codes.

DTCs (VSA)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Test-drive the vehicle at 31 mph (50 km/h) or more.

   NOTE:  Drive the vehicle on the road, not on a lift.

   - 5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   25-21 Yaw Rate Sensor Output Signal Malfunction
   26-21 Lateral Acceleration Sensor Output Signal Malfunction
   28-21 Longitudinal Acceleration Sensor Output Signal Malfunction
   28-22 Longitudinal Acceleration Sensor Stuck

   Is DTC 25-21, 26-21, 28-21, or 28-22 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting - Refer to:

   How to Troubleshoot the VSA System (2014 2015 2016) or

   How to Troubleshoot the VSA System (2017 2018 2019 2020) .

   If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. VSA modulator-control unit check (update)

   - 1. Update the VSA modulator-control unit if it does not have the latest software.

   - 2. Turn the vehicle to the OFF (LOCK) mode.

   - 3. Test-drive the vehicle at 31 mph (50 km/h) or more.

   NOTE:  Drive the vehicle on the road, not on a lift.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame

   Is DTC 25-21, 26-21, 28-21, or 28-22 indicated?

   YES 

   Check for loose terminals in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit .

   NO 

   Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.