VOLVO
SUM-0081 - Supply, sensor. 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 supply voltage to several of the suspension sensors is too low. The group consists of the front suspension acceleration sensors, the right rear position sensor and the body acceleration sensors. They share a common supply from the control module, so the fault may be in one sensor or in the control module.
Possible causes
- Ground fault in the supply wire to one of the sensors
- Poor contact in the connections
- Defective acceleration or position sensor
- Defective control module
What you can do
- 1Read out the fault codes first, and repair and clear any codes for the acceleration or position sensors before you continue
- 2Check that the connections at the sensors are not loose or oxidised
- 3Use a multimeter to check that the power supply to the sensors has no contact with ground (the car body)
- 4Check that the suspension system fuses are intact; the owner's manual shows where they are
- 5If the wiring checks out, a sensor or the control module is probably defective. Have a workshop check this
Symptoms you may notice3
- The general warning lamp lights
- Message in the display
- Four-C does not work
What the fault can affect1
- Four-C control is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.