Question about 2003 Jeep Grand Cherokee

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03 JGC losses power engine light blinks

After driving 10 miles at 55 then slowing to 25 engine light blinks,engine losses power. I pull over shut off the engine, check the codes 300, 301, 306, 442, 456. Turn it back on. Everything is fine again.

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I would start with a test drive with a fuel pressure gauge on it make sure you have spec. 35 - 40 psi. Clear codes and record all the freeze frame data in obd2 as you will need this in the diag process. 442 and 456 are evap codes I believe, do they return with the 300 misfire codes? Either way you need to reproduce the problem with the gauge on it and get the first code it sets. Could be fuel pump/filter/sending unit assy. In this case you will need to pay attention to the fuel level when this occurs. (same level as before)

Posted on Nov 24, 2008

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