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2022 S90 T6 "Transmission Service Required" Warning

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David L. · rep 0 · May 22, 5:10 AM · 1 replies · solved · Question

Vehicle: 2022 Volvo S90 T6 Inscription

My 2022 Volvo S90 T6 Inscription just popped up with a "Transmission Service Required" message on the dash. The car has about 30,000 miles on it. I haven't noticed any harsh shifting or strange noises from the transmission, but I'm definitely concerned.

The message appeared suddenly, and it hasn't gone away. I tried turning the car off and on, but it's still there. Is this a common issue with these newer Volvos? What could trigger such a warning without any obvious symptoms?

Should I be worried about driving it? I'm planning to call the dealer, but I'd like to have some idea of what I might be facing.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:10 AM

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ClearTheCode admin answer:

The "Transmission Service Required" message on your 2022 Volvo S90 T6 Inscription, even without noticeable symptoms, is a critical warning that should be addressed promptly. Modern Volvo transmissions are highly sophisticated and rely on numerous sensors and complex control units.

Possible Causes:

  1. Transmission Control Module (TCM) Fault: The TCM might be experiencing an internal fault or a communication error with other vehicle modules.
  2. Sensor Malfunction: A faulty speed sensor (input or output), temperature sensor, or pressure sensor within the transmission can trigger this warning.
  3. Low Transmission Fluid: While less common on sealed units, a leak leading to low fluid levels can cause warnings.
  4. Software Glitch: Sometimes, a temporary software anomaly can trigger a false warning.
  5. Valve Body Issues: Problems within the transmission's valve body, which controls fluid flow, can lead to warnings even before physical symptoms appear.
  6. Wiring or Connector Issues: Damaged wiring or a loose connector to the TCM or transmission sensors can cause intermittent or persistent warnings.

Troubleshooting Steps (Limited for user):

  1. Check for External Leaks: Visually inspect the area under the transmission for any signs of fluid leaks.
  2. Battery Check: Ensure your 12V battery is in good health. Low voltage can sometimes cause spurious electronic warnings.

When to See a Shop:

  • Immediately: A "Transmission Service Required" message is a serious warning. While you might not feel symptoms yet, continuing to drive could potentially exacerbate an underlying issue and lead to more severe damage.
  • Professional Diagnosis: A Volvo dealership or a specialized independent Volvo shop is essential. They have the proprietary diagnostic tools (VIDA system) to read specific transmission fault codes (which are often manufacturer-specific and not generic OBD-II codes). These codes will pinpoint the exact sensor, module, or hydraulic issue.
  • Do not ignore: Even if the message disappears temporarily, it's crucial to have it diagnosed. Early intervention can often prevent more costly repairs down the line.
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