Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Volvo V70 T-5, StandardFACTORY OEM SERVICE PROCEDURE
Central Electronic Module (CEM) Diagnostic Trouble Codes - 3 Of 12
- CEM-1A5F: Communication With The Brake Control Module, Signal Missing (2002-2004)
- CEM-1A61: Communication With The Transmission Control Module (TCM), Signal Missing (Aw50/51 AWD; W55-50/51SN; 2001)
- CEM-1A61: Communication With The Transmission Control Module (TCM), Signal Missing (Aw50/51 AWD; Aw55-50/51SN; 2002-2004)
- CEM-1A61: Communication With The Transmission Control Module (TCM), Signal Missing (Aw50/51 AWD; Aw55-50/51SN; 2005-2007)
- Diagnostic trouble code (DTC) information CEM-1A61
- Signal missing
- Checking the power supply and ground for the transmission control module (TCM)
- Checking the communication with the transmission control module (TCM)
- Checking the transmission control module (TCM)
- Signal missing
- General information
- Checking resistance in CAN-net
- Checking the traffic load on the CAN cables
- Identifying a control module in the CAN network
- Verification
- Checking short-circuiting to ground/voltage in CAN-net
- Checking voltage-drop in cable for CAN-H and CAN-L, respectively
- Checking the power supply and ground for the transmission control module (TCM)
- Checking the communication with the transmission control module (TCM)
- Checking the communication with the transmission control module (TCM) (continued)
- Checking the transmission control module (TCM)
- Fault-tracing information
- Information
- CEM-1A62: Communication With The Engine Control Module (ECM), Signal Missing (2001)
- Diagnostic trouble code (DTC) information CEM-1A62
- Signal missing
- CEM-1A62: Communication With The Engine Control Module (ECM), Signal Missing (2002-2004)
- Diagnostic trouble code (DTC) information CEM-1A62
- Signal missing
- Checking the engine type
- Checking the power supply and ground for the engine control module (ECM)
- Checking communication with the engine control module (ECM)
- Checking the engine control module (ECM)
- Signal missing
- General information
- Checking the resistance of the control area network (CAN) cables
- Checking a short-circuit in CAN cables
- Checking the traffic load on the CAN cables
- Identifying fault causes in the CAN network
- Identifying a control module in the CAN network
- Verification
- Checking the power supply and ground for the engine control module (ECM)
- Checking communication with the engine control module (ECM)
- Checking the engine control module (ECM)
- Information - intermittent fault
- Information
- Signal description. MSA 15.8
- CEM-1A62: Communication With The Engine Control Module (ECM), Signal Missing (2005-2007)
- CEM-1A62: Communication With The Engine Control Module (ECM), Signal Missing (B5244S; 2005-2007)
- CEM-1A62: Communication With The Engine Control Module (ECM), Signal Missing (B5244S6; 2005-2006)
- CEM-1A62: Communication With The Engine Control Module (ECM), Signal Missing (B5244T5; B5254T2; B5254T4; 2005-2007)
- CEM-1A63: Communication With The Accessory Electronic Module (AEM), Signal Missing (2005-2007)
- CEM-1A63: Communication With The Accessory Electronic Module, Signal Missing (2002-2004)
- Diagnostic trouble code (DTC) information CEM-1A63
- Signal missing
- CEM-1A64: Communication With The Differential Electronic Module (DEM), Signal Missing (2003-2004)
- Diagnostic trouble code (DTC) information CEM-1A64
- Signal missing
- CEM-1A64: Communication With The Differential Electronic Module (DEM), Signal Missing (2005-2007)
- Diagnostic trouble code (DTC) information CEM-1A64
- Signal missing
- Checking the power supply and ground for the differential electronic module (DEM)
- Checking communication with the differential electronic module (DEM)
- Checking the differential electronic module (DEM)
- Signal missing
- General information
- Checking resistance in CAN-net
- Checking the traffic load on the CAN cables
- Identifying a control module in the CAN network
- Verification
- Checking short-circuiting to ground/voltage in CAN-net
- Checking voltage-drop in cable for CAN-H and CAN-L, respectively
- Checking the power supply and ground for the differential electronic module (DEM)
- Checking communication with the differential electronic module (DEM)
- Checking communication with the differential electronic module (DEM) (continued)
- Checking the differential electronic module (DEM)
- Fault-tracing information
- Information
- CEM-1A65: Communication With The Suspension Module (Sum), Signal Missing (2005-2007)
- CEM-1A65: Communication With The Suspension Module (Sum), Signal Missing (2004)
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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