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2015 FORD F-150
5.0L V8 Coyote•RWD•AUTOMATIC•gas
14 active safety recalls on this vehicle — view recalls
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Repairs420Labor1001Torque8720Fluid18DTC3688Battery2Maintenance0Recalls14
P0598moderate severityPowertrain

Thermostat Heater Control Circuit Low

on 2015 Ford F-150 5.0L V8 Coyote · RWD

What this code means

The thermostat heater control circuit voltage is too low. A short to ground or failed heater element is the likely cause.

Symptoms

  • Check engine light illuminated
  • Poor engine temperature control
  • Reduced fuel economy

Common causes

  • Short to ground in heater circuit
  • Faulty heated thermostat
  • Damaged wiring harness
  • PCM output fault

Diagnostic steps

  1. Read thermostat heater codes
  2. Check circuit for short to ground
  3. Inspect harness near thermostat
  4. Measure control voltage during operation
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