Symptom:
P0125-INSUFFICIENT COOLANT TEMP FOR CLOSED-LOOP FUEL
CONTROL
When Monitored and Set Condition:
P0125-INSUFFICIENT COOLANT TEMP FOR CLOSED-LOOP FUEL CONTROL
When Monitored: With battery voltage greater than 10.4 volts, after engine is started.
Set Condition: The engine temperature does not go above a calibrated value. Failure time
depends on start-up coolant temperature and ambient temperature. (i.e. 2 minutes for a
start temp of 10°C (50°F) or up to 5 minutes for a vehicle with a start-up temp of -7°C
(20°F). Two Trip Fault.
POSSIBLE CAUSES
LOW COOLANT LEVEL
THERMOSTAT OPERATION
ENGINE COOLANT TEMPERATURE SENSOR
TEST ACTION APPLICABILITY
1 NOTE: If a Engine Coolant Temperature (ECT) DTC is set along with this
code, diagnose the ECT DTC first.
NOTE: Inspect the ECT terminals and related PCM terminals. Ensure the
terminals are free from corrosion and damage.
NOTE: The best way to diagnose this DTC is to allow the vehicle to sit
overnight outside in order to have a totally cold soaked engine.
Note: Extremely cold outside ambient temperatures may have caused this
DTC to set.
WARNING: Never open the cooling system when the engine is hot. The
system is under pressure. Extreme burns or scalding may result. Allow the
engine to cool before opening the cooling system.
Check the coolant system to make sure that the coolant is in good condition and at
the proper level.
Is the coolant level and condition OK?
All
Yes → Go To 2
No → Inspect the vehicle for a coolant leak and add the necessary
amount of coolant.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
81
DRIVEABILITY - NGC
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