Question about Chevrolet Silverado 1500
Code po 1258 is an overheating code, need to check why u r overheating, start simple, do u have fluid, has it been changed , might need thermostat, how old is truck,. is there a leak anywhere.do pressure check on radiator and see if it leaks, check radiator temperature vs engine temperature. get a thermo scanner they work good. point and it reads how hot . if motor is hotter replace thermostat. check make sure oil level is good. get back to me let me know what u find..
Posted on Mar 28, 2011
Its a code for engine temp. From the PCM. Start by changing thermostat and go from there. Could be that, a water pump, low coolant, or a faulty sensor. Start with the cheapest easiest thing first and work Ur way up. Check level and thermostat first.
Posted on Mar 28, 2011
On code p1258 put in new water punp new radtor were is no leak drive for 5 min. hot light come on speed will not pickup,
Posted on May 17, 2014
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Posted on Jan 02, 2017
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DTC P1258 - Engine Coolant Over-Temperature Protection
The powertrain control module (PCM) has the ability to disable 4 injectors during an engine over-temperature (overheating) conditoin. Engine is considered over-temperature whenever the engine coolant temperature reaches 268 F. This protection mode allows the PCM to alternate between groups of cylinders, thereby reducing coolant temperature. This is accomplished by disabling the fuel injectors. This DTC is set to show that an overheating condition was or is observed by the PCM and that the protection mode has been engaged.
You will need to inspect the cooling system to see what is causing your overheating issue. If the engine is not actually overheating, this code may be set due to a faulty engine coolant temperature (ECT) sensor.
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the first code is a generic code the latter code is a GM code and if this is correct the engine shut down because it was overheating for whatever reason or the sensor is faulty
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