Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Normal Operation
The PSCM runs a self test when the ignition is set to ON and the module is receiving at least 6 volts.
The self test compares the software in the module to the steering gear hardware. If the 2 items are not compatible, the EPAS enters a manual steering mode and sends a request to instrument cluster message center to alert the vehicle occupants and sends an EPAS_FAILURE message to other modules on the CAN.
This test generates a RVC for a new PSCM when directed to do so from pinpoint test.
- Z1: REFLASH AND VERIFY THE PSCM DTC
Using a diagnostic scan tool, make sure the PSCM is programmed (flashed) to the latest level of software. Follow all diagnostic scan tool instructions.
Clear the PSCM DTCs.
Ignition OFF.
Wait at least 90 seconds for the modules to completely shut off.
Ignition ON, engine OFF.
Press Read Vehicle Information button to retrieve DTCs from the vehicle.
NOTE: DTCs may be displayed from previous diagnostic actions.Does the DTC return?
Yes No Go to Z2. The condition causing the DTC is not present at this time. - Z2: OBTAIN PSCM RVC
Obtain the PSCM RVC.
INSTALL a new PSCM.
REFER to Steering Gear .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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