VOLVO
SRS-0021 - Passenger airbag, stage 1. Signal too low. Intermittent fault
System
Supplemental Restraint System (SRS)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
The SRS control module has registered that the voltage in the ignition cable to passenger airbag stage 1 has been too low for a longer period. The fault is intermittent: it has occurred at some point but may not be present right now. The cause is a short circuit to ground, either in the cable or the connectors or in the airbag itself.
Possible causes
- Short circuit to ground in the ignition cable or in the connectors between the passenger airbag and the SRS control module
- Short circuit to ground in the airbag
What you can do
- 1Read and note the code, clear it and road test the car to see whether it returns
- 2Have a workshop check that the connectors to the passenger airbag and the control module are fully engaged and not oxidised or damaged
- 3Have a workshop check that the cable to the passenger airbag is not chafed or pinched
- 4If the code returns: have a workshop check the cable to ground with diagnostic equipment
- 5Do not work on the airbag system yourself; the passenger airbag and its wiring are handled by a workshop
Symptoms you may notice1
- The SRS warning lamp is lit
General guidance for car owners. Diagnosis on the car can point to a different cause.