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2014 RAM 2500
6.7L I6 Cummins Diesel•4WD•AUTOMATIC•diesel•turbo
16 active safety recalls on this vehicle — view recalls🏆Sponsored by Anonymous Sponsor
Repairs436Labor517Torque1497Fluid10DTC1794Battery1Maintenance0Recalls16
P2681moderate severityPowertrain

Engine Coolant Bypass Valve Control Circuit/Open

on 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD

What this code means

The engine coolant bypass valve controls coolant flow to help manage engine temperature, and the PCM has detected an open or faulty control circuit. This can prevent proper coolant routing and affect warm-up and operating temperature.

Symptoms

  • Check engine light on
  • Slow engine warm-up
  • Erratic temperature gauge

Common causes

  • Faulty coolant bypass valve
  • Open or damaged wiring to valve
  • Corroded or loose connector
  • Failed PCM driver circuit

Diagnostic steps

  1. Scan and confirm P2681 with freeze frame
  2. Inspect bypass valve connector and wiring
  3. Test valve resistance and control circuit continuity
  4. Check PCM output signal and replace faulty parts
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