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Old 07-09-2015, 02:15 PM
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Jeep just died

Hello, My wife was on her way home and hit a bump in the road and our Grand Cherokee just died. The fuel gauge showed nothing, even after putting 5 gallons in the tank. I had it towed to a shop and the mechanic started it as soon as the rollback unloaded it. He has since let it run for hours on end and can't get it to act up. He says is shows no codes, but he suspects the crank sensor. I suspect the fuel pump as the gauge would not register even after putting 5 more gallons in it...I sure could use some advice before we start replacing parts.........

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Old 07-09-2015, 02:45 PM
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Re: Jeep just died

Welcome to the garage.
Which jeep (type/year/engine) do you have?
A shorted crank sensor will prevent the engine from starting and will keep the fuel gauge and volt gauge indicating at 0. This is because it shorts the 5V supply which comes from the PCM and the PCM gives the signal to the instrument cluster for fuel level and voltage.
If you have a 99-04 grand with 4.0 engine, then the wire bundle which runs at the back of the cylinder head can rub against a bolt and will short out, with the same result.
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Old 07-09-2015, 08:11 PM
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Re: Jeep just died

Sorry about omitting the model and such,,2002 / Grand Cherokee Limited / 4.7L
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Old 07-09-2015, 09:21 PM
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Re: Jeep just died

While Frango has probably forgotten more than I will ever know about how these things work, I'll still add my two cents.

Since it died after hitting a bump and later started and ran for some length of time without stalling, I would start by looking for a loose or corroded connection.


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Old 07-09-2015, 10:53 PM
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Re: Jeep just died

Eventhough a loose connector can not be discarded, you have now two faults, probably caused by the same problem:
1, the engine which shuts of and 2, the fuel gauge which shows 0.
Both problems are mostly caused by a PCM which has a shorted 5V sensor feed. (used to feed the crank and cam sensor, the TPS and MAP sensor)
Due to this short, the PCM will not send any info via the PCI data bus, like the fuel level and batt voltage. The crank sensor is well known (or better, infamous for) being faulty at one moment, while shortly thereafter working normal again.
If the fault is hard, its easier to troubleshoot, because you just remove the connectors from each sensor one at a time, until the fuel level indication returns.
Intermittent faults are a lot more difficult to troubleshoot, because you never know if a problem was solved doing some action, or that the fault was just not there at the moment.
Also a faulty PCI data bus could give the same symptoms, but i would first try the other options.
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