VOLVO
SUM-0121 - Solenoid, suspension right front. 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)
What does this fault code mean?
The voltage to the solenoid at the right front wheel is too low. The solenoid sits on the strut, and the Four-C function is blocked.
Possible causes
- Contact resistance in the connections
- Ground fault in the supply wire to the solenoid
- Damaged solenoid
What you can do
- 1Check the connections at the solenoid on the right strut for loose or oxidised contacts
- 2Use a multimeter to check that the power supply to the solenoid at the right front has no contact with ground (the car body)
- 3Check that the solenoid on the right strut is correctly fitted
- 4Check that the suspension system fuses are intact; the owner's manual shows where they are
- 5Have a workshop measure the solenoid's resistance and replace it if it is damaged
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.