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2017 AUDI S5
3.0L Supercharged V6•AWD•AUTOMATIC•gas•CGWD•supercharged
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Repairs0Labor496Torque3149Fluid9DTC1896Battery1Maintenance0Recalls0
P0890high severityPowertrain

TCM Power Relay Sense Circuit Signal Stuck On

on 2017 Audi S5 3.0L Supercharged V6 · AWD

What this code means

The transmission control module sees the power relay sense signal stuck in the on state. The relay is not de-energizing when commanded off.

Symptoms

  • Transmission warning light on
  • Relay stays powered after key off
  • Shifting problems

Common causes

  • Stuck TCM power relay
  • Wiring short to power
  • Corroded relay contacts
  • Faulty transmission control module

Diagnostic steps

  1. Scan for related transmission codes
  2. Test relay for stuck contacts
  3. Measure sense voltage during key off
  4. Inspect wiring for short to power
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