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.
Diagnostic Trouble Code (DTC) Information
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Diagnostic Trouble Code (DTC) Information
Diagnostic trouble code (DTC) information
Condition
After the ignition has been switch off, the engine control module (ECM) carries out internal checks. When the checks are complete, after approximately 2 minutes, the engine control module (ECM) interrupts the activation of the system relay coil. Diagnostic trouble code (DTC) ECM-820A is stored in the engine control module (ECM) if the system relay is active when the engine control module (ECM) has interrupted the activation of the system relay coil.
Substitute value
None.
Possible source
Faulty signal:
- short-circuit to ground in signal cable
- defective system relay
- short-circuit to supply voltage in the power cable.
Fault symptom[s]
None.
RENDER: 1.0x
NO RELATED
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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.