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Home >> Mazda >> 2021 >> CX-5 Signature >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (On-Board Diagnostics [Dynamic Stability Control]) >> DTC U0420-00: Abnormal Message From EPS Control Module >> Diagnostic procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic procedure

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
STEP INSPECTION ACTION
1 INSPECT FOR EPS CONTROL MODULE MALFUNCTION  Yes Go to applicable DTC inspection.
(See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS [ELECTRIC POWER STEERING (EPS)] .)
No Go to the next step.
2 VERIFY THAT THE SAME DTC IS NOT PRESENT  Yes Repeat the inspection from Step 1.
If the malfunction recurs, replace the EPS Control Module, then go to the next step.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
No Go to the next step.
3 VERIFY THAT NO OTHER DTCS ARE PRESENT 
  • Are any other DTCs output?
Yes Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .)
No DTC troubleshooting completed.