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 CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-9400DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294T
Diagnostic Trouble Code (DTC) Information
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294TSECTION Diagnostic Trouble Code (DTC) Information
Diagnostic trouble code (DTC) information
Condition
If the engine control module (ECM), with engine running, registers a malfunction on the brake pedal sensor's circuit, the brake light switch circuit, or on the CAN-communication between the brake control module (BCM) and the engine control module (ECM), the diagnostic trouble code is generated.
Substitute value
Cruise control switched off.
Possible source
Signal too high:
- Look for the cause of the malfunction in the brake control module (BCM) and in the central electronic module (CEM).
Incorrect signal:
- Malfunction in brake control module (BCM) or in central electronic module (CEM).
- Contact resistance or oxidation in the connections between the engine control module (ECM) and the brake light switch.
- Open circuit in the voltage feed to the brake light switch.
- Open circuit or short-circuit to ground or voltage in the cable for the brake light switch.
- Incorrectly installed brake light switch.
- Incorrectly adjusted brake light switch.
- Water in the connectors.
- Damaged brake light switch.
Signal missing:
- Look for the cause of the malfunction in the brake control module (BCM) and in the central electronic module (CEM).
Fault symptom[s]
- Cruise control does not function at all.
- Brake light constantly on.
- Message in information display
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.