You can google error codes too for definitions but posting them will reduce guessing from anyone. This wasn't an easy find but a learning experience.Īny check engine light means error codes are stored for immediate retrieval using a store reader like Autozone (free) or personal reader as long as the check engine light remains on. All rubber fuel lines are good but steel lines corrode until rust breaks and causes the evap leak error. I can state so because I had to replace the cap first then later learned to find a completely corroded fuel vent pipe (next to the main fuel pipe) broken from NYC winter salting. Its taken me several years to understand closed fuel vapor systems and how the charcoal canister absorbs vapors for recycling into the intake air system with a self purging cycle of the complicated EFI system. Normally this starts with a possible gas cap leak but can be something else related to the sealed fuel vapor system when the engine's running. When a thermostat is stuck open, it allows coolant. Here are the most common causes of P0128: Thermostat Stuck Open Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. Other error codes might be for a large evap leak, all pointing to either severe rust in steel vent lines to the fuel system or broken rubber hoses allowing a closed fuel system vapor leak. Fixing P0128 in the Saturn Ion is usually a pretty easy thing to do since, 90 of the time, a stuck thermostat will cause the problem. Unless you can post actual error codes, there is no gas cap error code but one of several codes like P0442 for a small leak in the evap system. This should result in at least one wire being grounded to turn off the low coolant light unless severe corrosion occurred to exposed wiring terminals. Try each wire, connecting to chassis bare metal. To test wiring, manually ground one wire (of two) from the disconnected coolant level sensor with ignition ON and see if the low coolant light turns off. The switch held closed is a ground signal sent to the ecm. When coolant level is lower the the low level mark, the sensor switch opens with the low coolant light turning on. Make sure that you're not driving around with a lit coolant. You could have: A bad sensor, a thermostat stuck closed, blown your engine. Make sure to check your engine when it is cold for an accurate reading. Engine coolant / antifreeze circulates through your engine to keep it cool in the summer but wont freeze in the winter. The coolant light is not for measuring the level, it's for engine coolant temperature. Adding engine coolant (also known as antifreeze) to your 2004 Saturn Ion is pretty easy. Going by '05 wiring for the coolant level indicator, the sensor is a normally open switch held closed by full coolant to keep the low coolant light off. Re: Coolant light stays on but coolant is at correct level.
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