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Diagnostic Trouble Code (DTC) Information
Diagnostic trouble code (DTC) information
Condition
Diagnostic trouble code (DTC) SUM-0203 is stored if the suspension module (SUM) registers that the difference in voltage between the central electronic module (CEM) and the suspension module (SUM) is greater than 2 V.
Note! The test is carried out every other operating cycle. The Suspension module (SUM) defines an operating cycle as ignition on and ignition off.
Substitute value
- Four-C control is switched off.
Possible source
- Contact resistance or oxidation in the connectors on the suspension module (SUM) or central electronic module (CEM)
- Internal fault in the control module.
Fault symptom[s]
- General warning lamp lit
- Message in the display
- Four-C does not work.