VOLVO
SUM-0201 - Control module. Signal too low
System
Suspension Module (SUM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007)
Show models by year and engine (7)
What does this fault code mean?
The battery voltage measured by the suspension control module is too low. The fault may be caused by a weak battery or charging system, poor contact in the connections, a fault in the power supply to the control module, or a defective control module. The Four-C function is blocked.
Possible causes
- Battery voltage too low
- Poor contact in the connections
- A break, or a ground fault, in the supply wire to the suspension control module
- Defective suspension control module
What you can do
- 1Check that the battery is fully charged and that the battery terminals are secure
- 2Use a multimeter to check that the battery voltage is normal with the engine idling. If it is too low, have a workshop check the charging system
- 3Check the connector to the suspension control module for contact resistance and oxidation
- 4Check the power supply wire to the control module and its fuse in the engine compartment
- 5If the voltage and connectors are in order, have a workshop check the control module
Symptoms you may notice3
- The general warning lamp lights
- Message in the display
- Four-C does not work
What the fault can affect1
- The Four-C function is blocked
General guidance for car owners. Diagnosis on the car can point to a different cause.