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2021 HONDA CIVIC
1.5L I4 Turbo•FWD•CVT•gas•turbo
4 active safety recalls on this vehicle — view recalls
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Repairs403Labor504Torque3392Fluid7DTC1173Battery1Maintenance0Recalls4
P1630high severityPowertrain

IMA Motor Rotational Sensor Signal Malfunction

on 2021 Honda Civic 1.5L I4 Turbo · FWD

What this code means

The Integrated Motor Assist (IMA) rotational sensor is sending a faulty signal to the motor control unit. This is a Honda manufacturer-specific code with no direct generic OBD-II equivalent.

Symptoms

  • IMA warning light on
  • Reduced hybrid assist
  • Poor fuel economy

Common causes

  • Faulty IMA motor rotational sensor
  • Damaged sensor wiring/connector
  • Motor control module fault
  • Charging/discharging system issue

Diagnostic steps

  1. Scan for IMA/hybrid codes
  2. Inspect rotational sensor wiring and connectors
  3. Test sensor signal output
  4. Check motor control module operation
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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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