ecm-640a
Moderate
Volvo · SUVs
Engine Control Module - Communication Bus Error
Quick Answer
Error code ECM-640A on your Volvo SUVs means: Engine Control Module - Communication Bus Error. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Inspect CAN bus wiring
2
Check CAN connectors for looseness
3
Test CAN bus voltage
4
Verify CAN terminator resistors
5
Replace ECM if faulty
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
CAN bus cable
CAN connectors
ECM module
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