A malfunctioning gas cap or a defective emissions control system component can cause the fault code. Symptoms include an illuminated CEL, subpar engine performance, stalling, and excessive exhaust smoke (among others). The P0455 Jeep code occurs when the PCM detects a large EVAP leak. An unattended EVAP leak can lead to hefty repair costs and poor vehicle performance. Many drivers often dismiss it due to its low drivability impact. Always protect yourself with safety glasses and gloves when working with the coolant on your Grand Cherokee.Disclosure: We may get commissions for purchases made through links in this post.Ĭode P0455 is a fault code usually found in sedans, SUVs, and even luxury vehicles. An anti-freeze leak can cause the temp sensor to record high engine temperatures in a 1999 Jeep Grand Cherokee. If you ignore a small coolant leak long enough, you will run out of coolant, which leads to an overheated engine and other serious, but highly avoidable, problems. This video shows you where the coolant reservoir, hoses and connections on your 1999 Grand Cherokee Limited are located and the steps needed to fix minor leaks.Ī few things to note about coolant is that it is sweet tasting and highly toxic, so it can end up in the dog's stomach pretty quickly. Otherwise, your Grand Cherokee may have a radiator leak.
However, a coolant leak (aka an antifreeze leak) is most likely to occur where the hoses connect to the engine or radiator.
Coolant / antifreeze can leak from the reservoir, radiator or any hose, in 1999 Grand Cherokee with the 4.0 liter engine.
Engine coolant (which is also called antifreeze or anti-freeze) moves through the inside of your Grand Cherokee engine and keeps it from overheating. Leaking coolant / antifreeze is one of the more common types of leaking fluid from Grand Cherokee engines. Follow the steps in this video to see how to fix minor coolant (antifreeze) leaks in your 1999 Jeep Grand Cherokee.
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