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2000 TOYOTA MR2
1.8L I4•RWD•AUTOMATIC•gas•1ZZ-FE
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Repairs0Labor492Torque2151Fluid7DTC1697Battery1Maintenance0Recalls0
P0899moderate severityPowertrain

Transmission Control System MIL Request Circuit High

on 2000 Toyota MR2 1.8L I4 · RWD

What this code means

The transmission control module MIL request circuit is reading higher voltage than expected. This usually points to an open circuit or wiring fault between modules.

Symptoms

  • MIL operation abnormal
  • Transmission warning light
  • Possible limp mode

Common causes

  • Open or high resistance in MIL request circuit
  • Faulty transmission control module
  • Corroded or loose connectors
  • PCM/TCM communication fault

Diagnostic steps

  1. Check MIL request circuit for opens or high resistance
  2. Inspect connectors for corrosion
  3. Verify communication between PCM and TCM
  4. Test module supply voltage and grounds
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