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 CHARTSTCM CODES (TRANSMISSION CONTROL MODULE)TCM-001FSIGNAL MISSING. INTERMITTENT FAULTAW55-50/51SN / AW50/51 TRANSMISSION
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294T
AW55-50/51SN / AW50/51 Transmission
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294TSECTION AW55-50/51SN / AW50/51 Transmission
Signal missing. Intermittent fault
Intermittent fault
- Ignition off.
Check the control module and transmission output speed sensor connectors. Check for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the power supply cable between transmission control module (TCM) terminal #57 (#A57) and transmission output speed sensor connector terminal #A4. Check for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the signal cable between transmission control module (TCM) terminal #39 (#A39) and transmission output speed sensor connector terminal #A3. Check for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box, B5254T2 Connecting the Test Box
- To disconnect the transmission control module (TCM), see Transmission control module (TCM), replacing, B5254T2, AW50/51 AWD, B5254T2, AW55-50/51SN Service and Repair
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting
- To check and replace the transmission output speed sensor, see Input speed sensor/output speed sensor, replacing Input Speed Sensor/Output Speed Sensor, Replacing
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN, AW50/51 AWD Signal Description. Transmission Control Module (TCM).
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - Exit fault-tracing
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Attempt New Test - Intermittent fault
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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.