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 MANUALSVOLVO2010XC70 AWD L6-3.2L VIN 96 B6324S2REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONU CODE CHARTSU0401U040181 (HEADLAMP CONTROL MODULE - HCM)DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION
2010 Volvo XC70 AWD L6-3.2L VIN 96 B6324S2
Diagnostic Trouble Code (DTC) Information
2010 Volvo XC70 AWD L6-3.2L VIN 96 B6324S2SECTION Diagnostic Trouble Code (DTC) Information
Diagnostic trouble code (DTC) information HCM-U040181
Condition
The control module is continuously supplied with information about current outdoor temperature from Engine control module (ECM) via CAN-communication. The control module checks the quality of the information from the Engine control module (ECM).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Information from Engine control module (ECM) is incorrect/unreasonable.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.
Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.
Substitute value
- None.
Possible source
- Faulty outside temperature sensor.
- Fault-trace in transmitting control module.
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.