What does P1258 code mean?
What does P1258 code mean?
DTC P1258. Circuit Description. The powertrain control module (PCM) uses the engine coolant temperature (ECT) sensor to monitor the engine for an over temperature condition. This condition occurs when the coolant temperature is above 128 C (262 F). When an over temperature condition is present, DTC P1258 will set.
When does the PCM consider the engine over temperature?
The PCM considers the engine over temperature whenever the Engine Coolant Temperature ( ECT) reaches a predetermined temperature. This DTC sets in order to show that the PCM detected an over temperature condition and that the system engaged the protection mode.
What does cylinder head over temperature protection active mean?
Note that the definition “Cylinder Head Over-temperature Protection Active” refers to both the facts that an overheating condition exists, and that the PCM has initiated a “Fail Safe” mode, which is a series of actions designed to prevent the engine from overheating further to help protect it against suffering potentially fatal damage.
What causes a faulty coolant in a Chevrolet?
P1258 CHEVROLET Possible Causes Faulty Engine Coolant Temperature Engine Coolant Temperature harness is open or shorted Engine Coolant Temperature circuit poor electrical connection
Why is the CHT sensor not in contact with the coolant?
In this type of engine temperature monitoring system, the dedicated CHT sensor is not in contact with the engine coolant, since in some cases, an engine can suffer fatal overheating within seconds if the engine loses its coolant, which is a circumstance that is not always reflected by the temperature gauge on the dashboard.
How does p1258 Chevrolet engine coolant overtemperature protection work?
P1258 CHEVROLET Description In order to reduce the engine temperature the Powertrain Control Module (PCM) has the ability to disable a number of fuel injectors during an engine over temperature condition. The PCM considers the engine over temperature whenever the Engine Coolant Temperature (ECT) reaches a predetermined temperature.
The PCM considers the engine over temperature whenever the Engine Coolant Temperature ( ECT) reaches a predetermined temperature. This DTC sets in order to show that the PCM detected an over temperature condition and that the system engaged the protection mode.
Note that the definition “Cylinder Head Over-temperature Protection Active” refers to both the facts that an overheating condition exists, and that the PCM has initiated a “Fail Safe” mode, which is a series of actions designed to prevent the engine from overheating further to help protect it against suffering potentially fatal damage.
P1258 CHEVROLET Possible Causes Faulty Engine Coolant Temperature Engine Coolant Temperature harness is open or shorted Engine Coolant Temperature circuit poor electrical connection
