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2005 RAM 1500
5.7L V8•4WD•gas•HEMI
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Repairs0Labor517Torque141Fluid11DTC1809Battery1Maintenance0Recalls0
P0842moderate severityPowertrain

Transmission Fluid Pressure Sensor/Switch A Circuit Low

on 2005 Ram 1500 5.7L V8 · 4WD

What this code means

The PCM detected a voltage lower than expected in the transmission pressure sensor A circuit. This may indicate a short to ground or a failed sensor.

Symptoms

  • Poor shift quality
  • Transmission slipping
  • Warning light illuminated

Common causes

  • Short to ground in wiring
  • Faulty pressure sensor
  • Corroded connector
  • Low line pressure

Diagnostic steps

  1. Scan and record fault codes
  2. Inspect wiring for shorts to ground
  3. Check connector for corrosion
  4. Measure sensor signal voltage
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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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