VOLVO
AEM-6C56 - Alarm output S1. Signal too low. Intermittent fault
System
Accessory Electronic Module (AEM)
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?
At some point the AEM registered a signal that was too low on the S1 alarm output wire while that output was activated. The fault is intermittent and may not be present now. Output S1 is disabled until the next ignition cycle, and the alarm does not work in the meantime.
Possible causes
- Signal cable for alarm output S1 shorted to ground
- Damaged alarm
What you can do
- 1Follow the S1 alarm output wire and look for intermittent chafing or shorts to ground
- 2Check the alarm connectors for oxidation and loose connections
- 3Clear the code and check whether it returns
- 4If the fault returns, have a workshop check the alarm
Symptoms you may notice1
- The alarm does not work at all
What the fault can affect1
- Output S1 is disabled until the next ignition cycle
General guidance for car owners. Diagnosis on the car can point to a different cause.