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2003 TOYOTA TACOMA
2.7L I4•RWD•AUTOMATIC•gas•3RZ-FE
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor1066Torque2197Fluid17DTC3480Battery2Maintenance0Recalls5
P0594low severityPowertrain

Cruise Control Servo Control Circuit/Open

on 2003 Toyota Tacoma 2.7L I4 · RWD

What this code means

The PCM detected an open in the cruise control servo control circuit. The servo that adjusts throttle for cruise cannot be controlled properly.

Symptoms

  • Cruise control does not maintain speed
  • Cruise control fails to engage
  • Speed drifts when cruise set

Common causes

  • Open in servo control wiring
  • Faulty cruise control servo
  • Poor servo connector contact
  • PCM driver circuit fault

Diagnostic steps

  1. Scan for cruise servo codes
  2. Check servo control circuit continuity
  3. Inspect servo connector and pins
  4. Test servo actuation with scan tool
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