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Home >> Dodge and Ram >> 2001 >> Durango 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0125: Closed Loop Temp Not Reached >> Testing

DTC P0125: Closed Loop Temp Not Reached: Testing

  1. Turn ignition on, engine off. Using scan tool, read DTCs. If GOOD TRIP counter for DTC P0125 is displayed and displayed count is "0", go to next step. If GOOD TRIP counter for DTC P0125 is not displayed or displayed count is not "0", go to step  5.
    2. NOTE: Diagnose ECT sensor DTC(s) prior to performing following steps. Before performing the following diagnostic steps, engine must be cold soaked overnight.
    NOTE: Extremely low ambient temperatures may cause DTC P0125 to be stored in PCM.
  2. Check ECT and Powertrain Control Module (PCM) connectors and terminals for corrosion or damage. Ensure coolant level is in good condition and at proper level. Repair connectors or terminals as necessary. Replace or top off coolant as necessary. If coolant condition and level is okay and no concerns with connectors or terminals are present, go to next step.
  3. Turn ignition on, engine off. Using scan tool, read ENG COOLANT TMP DEG value. If engine was allowed to sit overnight, scan tool temperature value should be near ambient air temperature. If engine coolant temperature is more than 180°F (82°C), allow engine coolant temperature to cool down to 150°F (66°C) before proceeding. If engine coolant temperature is 150°F (65°C) or less, start engine. Using scan tool, monitor ENG COOLANT TMP DEG value until engine coolant temperature reaches 180°F (82°C). Temperature value should increase smoothly from start-up to normal operating temperature. If ENG COOLANT TMP DEG value increased smoothly and reaches 180°F (82°C), go to next step. If ENG COOLANT TMP DEG value does not increase smoothly or does not reach 180°F (82°C), replace ECT sensor.
    4. NOTE: The following procedure works best when engine is allowed to cold soak overnight.
    WARNING: Never remove radiator cap when engine is hot. Cooling system is under pressure and extreme burns may occur. Allow engine to cool prior to opening cooling system.
  4. Turn ignition on, engine off. Using scan tool, read ENG COOLANT TMP DEG value. If engine was allowed to sit overnight, scan tool temperature value should be near ambient air temperature. If engine coolant temperature is more than 180°F (82°C), allow engine coolant temperature to cool down to 150°F (66°C) before proceeding. If engine coolant temperature has reached 150°F (65°C) or less, place thermometer in cooling system so that actual coolant temperature can be monitored. Start engine and allow it to idle. Using scan tool, monitor ENG COOLANT TMP DEG until engine coolant temperature reaches 180°F (82°C). Scan tool temperature value and actual coolant temperature should be relatively close and should increase smoothly from start-up to normal operating temperature. Monitor coolant temperature and note when thermostat opens. Thermostat should open at about 195°F (90°C). Replace thermostat as necessary. If thermostat opens as specified, go to next step.
  5. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Check for any related Technical Service Bulletins (TSBs) that may apply. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors. Start engine. Wiggle ECT sensor connector and wiring harness while monitoring scan tool display. If GOOD TRIP counter display changes to "0", repair connector or wiring harness where wiggling caused display to change. If GOOD TRIP counter display does not change to "0", no problem is indicated at this time and test is complete.
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