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-0094CONTROL MODULESIGNAL MISSING
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294T
Signal Missing
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294TSECTION Signal Missing
Signal missing
Checking communication
- Ignition on.
Press the brake pedal. Move the gear selector to different positions.
Check that the gear position is updated in the display in the combined instrument panel.
Is the gear position updated?
Yes - Intermittent fault
No - Checking the wiring and component
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Checking the wiring and component
- Ignition off.
Check ground terminal 31/6 at the A-post. Check for contact resistance and oxidation. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the communication cable between gear selector control module terminal #2 and transmission control module (TCM) terminal #B21 (#B31). Check for an open-circuit. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the 6-pin connector and connector 54/3RF (passenger compartment cable harness - engine compartment cable harness). Check for damage to the terminals and pins.
Check the cable between the gear selector module (GSM) terminal #6 and ground terminal 31/6. Check for an open-circuit. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Replace the circuit board in the top panel if no fault is found in the wiring or connectors.
Other information:
- To connect the breakout box, see Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM)
- To replace the circuit board in the top panel (standard), see Printed circuit board gear selector assembly / top panel, replacing Printed Circuit Board Gear Selector Assembly/Top Panel, Replacing
- To replace the circuit board in the top panel (Geartronic), see Printed circuit board gear selector assembly / top panel Geartronic, replacing Printed Circuit Board Gear Selector Assembly/Top Panel Geartronic, Replacing
- For information about signals, Signal Description. Transmission Control Module (TCM).
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition on.
Depress the brake pedal. Move the gear shift selector to different positions. Check that the gear position is updated in the display in the combined instrument panel.
Is the gear position updated?
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 communication
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Intermittent fault
Check ground terminal 31/6 at the A-post. Check for contact resistance and oxidation. See Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the communication cable between gear selector control module terminal #2 and transmission control module (TCM) terminal #B21 (#B31). Check for an open-circuit. See Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the 6-pin connector and connector 54/3RF (passenger compartment cable harness - engine compartment cable harness). Check for damage to the terminals and pins.
Check the cable between the gear selector module (GSM) terminal #6 and ground terminal 31/6. Check for an open-circuit. See Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM)
- For information about signals, 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 - Checking communication
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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.