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2020 MAZDA MAZDA3
2.5L Skyactiv-G I4 (186 hp)•AWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor987Torque6478Fluid16DTC2264Battery2Maintenance0Recalls2
P1512low severityPowertrain

VTCS Fault

on 2020 Mazda Mazda3 2.5L Skyactiv-G I4 (186 hp) · AWD

What this code means

The PCM has detected a fault in the Variable Tumble Control System. The VTCS controls intake air tumble by opening and closing runner valves to improve combustion efficiency at various engine speeds.

Symptoms

  • Check Engine Light
  • Slight loss of performance at certain RPMs
  • Minor fuel economy reduction

Common causes

  • VTCS solenoid valve failure
  • VTCS actuator stuck from carbon
  • Wiring issue in VTCS circuit
  • VTCS vacuum supply leak
  • Connector corrosion

Diagnostic steps

  1. Test VTCS solenoid resistance
  2. Command VTCS with scan tool and verify actuator movement
  3. Inspect VTCS actuator for carbon binding
  4. Check vacuum supply to VTCS
  5. Inspect wiring and connector

Repair notes

Replace the VTCS solenoid or clean the VTCS actuator if stuck from carbon.

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