P0125 - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

P0125

 

 
 
 
Old 09-24-2009, 03:42 PM
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Default P0125

P0125

Description
ECT SENSOR EXCESSIVE TIME TO REACH CLOSED LOOP

While engine is warming, PCM reads Engine Coolant Temperature
(ECT) sensor to determine how long it takes coolant to reach
temperature required for closed loop operation. PCM compares actual
time required to a predetermined time.

Symptoms
You will likely not notice any drivability problems. Only the SES light.

Causes
  • Insufficient warm up time
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty coolant temperature sensor
  • Defective ECT sensor
Solutions

The easiest thing to do is to reset the code and see if it comes back.
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