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.
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HOMESERVICE MANUALSVOLVO2004V70 L5-2.4L VIN 64 B5244S6REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-A03BFAULTY SIGNAL
2004 Volvo V70 L5-2.4L VIN 64 B5244S6
Faulty Signal
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Faulty Signal
Faulty signal
Checking the control area network (CAN) and central electronic module (CEM)
The engine control module (ECM) has registered a fault in the communication with the central electronic module (CEM). The fault is caused either by a problem with controller area network (CAN) communication or an internal fault in the central electronic module (CEM).
For further fault-tracing, check if there are diagnostic trouble codes (DTCs) stored in the central electronic module (CEM).
Remedy as necessary.
Other information:
- To access or replace the central electronic module (CEM), see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing.
Continue - Fault-tracing information
FAULT FOUND
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Fault-tracing information
Information
Fault-tracing information
In case of this defect, troubleshooting is not followed by verification.
The information can be displayed again or the fault-tracing for this fault can be interrupted.
Do you want to view the information again?
Yes - Attempt New Test
No - Fault Found
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Attempt New Test - Checking the control area network (CAN) and central electronic module (CEM)
FAULT FOUND - Fault Found
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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.