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-4801PERMANENT FAULT
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294T
Permanent Fault
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294TSECTION Permanent Fault
Permanent fault
Checking for air leakage in the intake system
Check for air leakage. See Check for air leaks in the intake system Air Leaks in the Intake System, Checking.
Remedy as necessary.
Was there any air leakage?
Yes - Verification
No - Checking for air leakage in the exhaust system
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Checking for air leakage in the exhaust system
Check for air leakage. See Checking for air leakage in the exhaust system Air Leakage Exhaust System, Check.
Remedy as necessary.
Was there any air leakage?
Yes - Verification
No - Checking fuel and residual pressures
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Checking fuel and residual pressures
Check the fuel pressure and residual pressure. Checking Fuel and Residual Pressures.
Was the pressure OK?
Yes - Checking the compression
No - Verification
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Checking the compression
Test the compression. Compression Test
Remedy as necessary.
Is the compression OK?
Yes - Replacing the component
No - Verification
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Replacing the component
- Try a new three-way catalytic converter (TWC). Replace according to Three-way catalytic converter (TWC), replacing Service and Repair.
Select "Continue" when the fault has been remedied.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows:
- Ignition off.
- Replace connector, components etc.
- Test drive car according to Verifying repairs Verifying Repairs.
Note! After test driving the engine should not be turned off. Information in the control module is erased.
- Connect VCT 2000 to the data link connector (DLC).
- Read off the status of the diagnostic trouble code (DTC). The text NOT READY is displayed if the diagnosis is still on-going. This indicates that the test drive was too short.
Is FAULT NOT REGISTERED displayed?
Yes - Verification completed
No - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit Fault-Tracing
No - Attempt New Test
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Attempt New Test - Checking for air leakage in the intake system
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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.