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DTC P0125: Closed Loop Temp. Not Reached

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Closed loop operation is monitored after engine has been running for 10 minutes. DTC may be stored in Powertrain Control Module (PCM) if engine temperature does not increase more than 50°F (10°C) in 13 minutes after engine is started for 2 consecutive trips. Possible causes are: defective thermostat, defective Engine Coolant Temperature (ECT) sensor, defective PCM, or defective connectors or wiring.
  1. Turn ignition on with engine off. Using scan tool, read FREEZE FRAME data while attempting to duplicate the condition that caused DTC. Using scan tool, check for DTCs. If this DTC is not reset, go to next step. If this DTC is reset, go to step  3 .
  2. At this time, conditions for closed loop temperature not reached does not exist or is an intermittent problem. Ensure proper coolant level exists, cooling system is operating properly and no coolant leaks exist. If proper coolant level exists, cooling system is operating properly and no coolant leaks exist, test is complete. If improper coolant level exists, cooling system is not operating properly or coolant leaks exist, repair as necessary. Perform TEST VER-5A  .
  3. Turn ignition off. Disconnect ECT sensor connector. ECT is located near thermostat housing and contains Black/Light Blue wire and Tan/Black wire in the connector.
  4. Inspect ECT sensor connector for corroded, pushed out, miswired or damaged terminals. If terminals are not corroded, pushed out, miswired or damaged, go to next step. If terminals are corroded, pushed out, miswired or damaged, repair connector as necessary. Perform TEST VER-5A  .
  5. Ensure ignition is off. Disconnect PCM connectors. PCM is located between driver's side front fender and power distribution center, near battery.
  6. Inspect PCM connectors for corroded, pushed out, miswired or damaged terminals. If terminals are not corroded, pushed out, miswired or damaged, go to next step. If terminals are corroded, pushed out, miswired or damaged, repair connector as necessary. Perform TEST VER-5A  .
  7. Using ohmmeter, check resistance between electrical terminals on ECT sensor. If resistance is less than 11,000 ohms, go to next step. If resistance is 11,000 ohms or more, replace ECT sensor. Perform TEST VER-5A  .
  8. Check that thermostat operates properly. If thermostat operates properly, replace PCM. Perform TEST VER-5A  . If thermostat does not operate properly, replace thermostat. Perform TEST VER-5A  .
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