DTC Troubleshooting: P0126 (86)
DTC P0126:
 Insufficient Engine Coolant Temperature
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Check the ECT SENSOR 1 in the DATA LIST with the HDS.
Is about 20 °C (68 °F) or less indicated?
YES -
Go to Step 2 .
NO -
Intermittent failure, the system is OK at this time. Check the thermostat and the cooling system.■
  1. Start the engine, and let it idle for 20 minutes.
  1. Check the ECT SENSOR 1 in the DATA LIST with the HDS.
Is about 20 °C (68 °F) or less indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Check the thermostat and the cooling system.■
  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Allow the engine to cool below 20 °C (68 °F).
  1. Start the engine, and let it idle for 20 minutes.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0126 indicated?
YES -
Check for poor connections or loose terminals at ECT sensor 1 and ECM, then go to Step 1 .
NO -
Go to Step 11 .
  1. Monitor the OBD STATUS for DTC P0126 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at ECT sensor 1 and the ECM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 8 .