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ME9 / U0122 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Cruise control not working. Message appears in display.

  U0122 00


ESP Missing on BUS

Fault symptom

Cruise control not working.

Message appears in display.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.
Battery voltage must be between 10 - 18 V.

Fault criteria:

No communication with ESP

Dependent:

None

Fault handling:

Type III
(See section Fault handling III, "Other emission-related components and functions" for more information.)

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Electrical fault on bus leads or in the component.
See fault diagnosis for the TCS/ESP DTC in question and bus fault diagnosis.

Functions in the diagnostic tool related to the fault:

Response test, under "All/Bus" menu.
Read / Reset Bus Configuration
Read / Clear Bus Off Counter