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 MANUALSVOLVO2004S80 L6-2.9L TURBO VIN 91 B6294TREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSBCM CODES (BRAKE CONTROL MODULE)BCM-0074FAULTY SIGNAL
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294T
Faulty Signal
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294TSECTION Faulty Signal
Faulty signal
Checking the function of the hydraulic valves
- Ignition off
- Check the brake control module (BCM) connector. Check for contact resistance and oxidation
- Reconnect the components, connectors etc.
- Ignition on.
Try to activate the hydraulic valves.
There should be a "ticking" noise.
Other information
- To disconnect the control module, see Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box
- Checking wiring and terminals Checking Wiring And Terminals
Can the valves be activated?
Yes - FAULT FOUND
No - Replacing the control module and programming
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Replacing the control module and programming
Caution! A new control module is delivered without software. The control module must be programmed in order to function after replacement.
For further information about programming and replacing the control module, see Brake Control Module (BCM), replacing Brake Control Module (BCM), Replacing.
Continue - FAULT FOUND
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RENDER: 1.0x
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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.