VOLVO
CEM-1A62 - Communication with the engine control module (ECM). Signal missing
System
Sentral elektronikk (CEM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
5 modellerS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Hva betyr feilkoden?
The central electronic module (CEM) has lost communication with the engine control module (ECM) and sets this code. The fault lies in the communication, not in the CEM, so the CEM should not be replaced. Without contact with the engine control module, the engine may stall, feel sluggish or fail to start even though the starter motor turns.
Mulige årsaker
- The ECM is not getting power
- The ground wire to the ECM is broken
- Contact resistance in the connections
- Broken CAN wiring to the ECM
- Wrong ECM for this car, for example a used module with different software or hardware
- A common CAN network fault if several communication faults are stored at the same time
Hva du kan gjøre
- 1Check the ECM fuse. If it has blown, replace it once. If it blows again, use a multimeter to check the wire after it has no contact with ground.
- 2Check that the connectors to the engine control module are seated and free of corrosion, chafing or damage. Check that the ground point on the engine is clean and tight
- 3Use a multimeter to check the power supply and ground leads to the ECM for breaks. The fault may be intermittent if a lead has play
- 4Check first which engine variant the car has, since the signals differ between petrol and diesel engines
- 5After the work, clear the code, start the engine and check that the code does not return
Symptomer du kan merke5
- The starter cranks but the engine will not start
- The engine stalls, including while driving
- The engine feels sluggish
- The malfunction indicator lamp (MIL) is lit
- A message appears in the display
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