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Home >> Jeep >> 2005 >> Wrangler X, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Powertrain Diagnostic Procedures - DRIVEABILITY - NGC Symptoms & Diagnostic Tests (DTCS P0016 To P0563)) >> DRIVEABILITY - NGC - Diagnostic Tests >> P0128-Thermostat Rationality (Gas - NGC) >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. GOOD TRIP EQUAL TO ZERO
  2. LOW COOLANT LEVEL
  3. THERMOSTAT OPERATION
  4. SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
  5. TEMPERATURE SENSOR
  6. SIGNAL CIRCUIT OPEN
  7. (K900) SENSOR GROUND CIRCUIT OPEN
  8. SIGNAL CIRCUIT SHORTED TO GROUND
  9. SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND
  10. OTHER POSSIBLE CAUSES
  11. PCM
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