Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-1C04

Condition




The central electronic module (CEM) checks the 30-supply.
The diagnostic trouble code (DTC) is stored if the control module registers that the 30-supply exceeds 17 volts for at least 5 minutes.
The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute value
- None.

Possible source
- Damaged generator (GEN)
- Damaged charge regulator
- Damaged battery.

Fault symptom[s]
- The "Generator not charging" warning lamp is lit when the engine is running
- Alternator and charge regulator/Power supply problems
- The headlamp bulb blows
- The "Generator not charging" warning lamp does not light when the ignition is switched on
- Low rotation speed in the starter motor
- Starting/Engine does not start/Unsure when/at all times
- The electrolyte in battery boils with the engine running
- The battery discharges.