2022 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

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DTC U2300:55 (AUTO LEVELING CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 VERIFY ALL SYSTEM DTCs
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Switch the ignition ON (engine off or on) and wait for 30 s or more.
  • Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION .)
  • Are there any modules other than the auto leveling control module displaying DTC U2300:55?
 Yes Perform the body control module (BCM) configuration, then go to the next step.
(See CONFIGURATION .)
No Go to repair completion verification 1.
2 VERIFY ALL SYSTEM DTCs AGAIN
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Switch the ignition ON (engine off or on) and wait for 30 s or more.
  • Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION .)
  • Are there any modules other than the auto leveling control module displaying DTC U2300:55?
 Yes Replace the body control module (BCM) and perform the repair completion verification.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION .)
No Go to the next step.
Repair completion verification 1 VERIFY THAT VEHICLE IS REPAIRED
  • Install/connect the part removed/disconnected during the troubleshooting procedure.
  • Clear the DTC recorded in the memory. (See CLEARING DTC .)
  • Switch the ignition ON (engine off or on) and wait for 30 s or more.
  • Perform the DTC inspection for the auto leveling control module.

    (See DTC INSPECTION .)

  • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW (US) .)
If the CAN communication is normal, perform the diagnosis from Step 1.
  • If the malfunction recurs, replace the auto leveling control module, then go to the next step.
No Go to the next step.
Repair completion verification 2 VERIFY IF OTHER DTC IS DISPLAYED
  • Perform the DTC inspection. (See DTC INSPECTION .)
  • Are any other DTCs displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
No DTC troubleshooting completed.
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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.