Question

What should you know about the P1258 code?

The P1258 code indicates a problem with the throttle sensor. The code triggers in your car when the powertrain control module (PCM) checks the sensors on the gas pedal and motor throttle, comparing both to make sure they're functioning together.

What are the reasons why P1258 code triggers? 

If there’s an issue with a sensor or both, the PCM will activate code P1258. The code can be triggered for a few reasons, such as the following: 

• The throttle needs replacement. 
• The sensors that connect the throttle to the PCM are rusty or broken. 
• There’s a need for the Pedal Relearning cycle to reset the accelerator. 

What are the causes of P1258 code? 

Here are some mechanical reasons that can cause this engine code error:

• A low level of engine coolant or a radiator that is empty.  
• A thermostat that leaks or won’t stay open.  
• Plugged radiator.  
• The engine coolant temperature sensor does not work.  
• Bad connection with the coolant temperature sensor.  
• Bad circuit. 

What are the symptoms of P1258 code? 

You can sense this error code by analyzing a few things, like: 

• The check engine light turns ON.  
• The engine gets too hot. 
• Your car stops running and won’t start.

How to diagnose this engine code? 

To figure out what a P1258 code means, a mechanic would:  

• Try to find codes.  
• Check for leaks, level, and condition of the coolant.  
• Make sure the thermostat works right.  
• Check the parts of the cooling system.  
• Look for blockages in the radiator and hoses.  

Common mistakes while diagnosing this error code  

Here are some of the most common mistakes a mechanic may make when trying to figure out what this code means:  

• Not making sure there is enough coolant in the system.  
• Not changing the thermostat if it is broken.
• Getting rid of the code without fully figuring out what it means. 
• Not checking to see if the coolant temperature sensor circuit has any corrosion or loose connections. 

How Bad Could a P1258 Error Code Be?  

If you get a P1258 code, you should take it seriously because the problem will only get worse if you don’t fix it. If a car overheats quickly, it could damage the engine, such as warped cylinder heads and blown head gaskets. The driver should stop as soon as it is safe to do so, turn off the engine, and call for help right away.