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 ECM-201A
Condition
During the engine warm-up phase, the way the temperature increases is checked. This is compared with the expected temperature increase, calculated for example according to load conditions and starting temperature.
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the measured engine coolant temperature (ECT) deviates too much from a calculated temperature.
The diagnostic trouble code (DTC) can be diagnosed with the engine running and at operating temperature, after the engine has first been allowed to cool from operating temperature for at least 8 hours.
Substitute value
- None.
Possible source
- Damaged thermostat.
Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- The engine does not become warm.
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.