VOLVO
SUM-0151 - Keypad. 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 signal from the keypad in the car is too low. The keypad sends its signal to the suspension control module, and the Four-C function is blocked.
Possible causes
- Contact resistance in the connections
- Ground fault in the supply wire to the keypad
- Defective keypad
What you can do
- 1Check the connectors at the keypad and at the control module for contact resistance and oxidation
- 2Use a multimeter to check that the power supply wire to the keypad has no contact with ground (the car body)
- 3If you have a diagnostic tool: read live data for the keypad and see whether the value changes when you press the buttons
- 4Check that the suspension system fuses are intact; the owner's manual shows where they are
- 5If the wiring is intact, have a workshop replace the keypad
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.