Well the jeep has started doing this annoying thing with the gauge cluster. Im not sure if its even related to it being a diesel. It will randomly decide to start lighting up different symbols. But the 3 that are consistent is the low fuel indicator and gauge falls to empty and will ding, the check oil or low oil pressure with illuminate and ding like crazy, and the water in fuel light will come on. They come on and off randomly, sometimes once and sometimes will cycle on and off multiple times. I first thought it was a ground. But today I noticed the A/C would not work while it was acting like this. Im now kinda leaning toward possibly the ecm? Idk if its related, but i also have this weird issue with hyper flash on the left turn signal. I thought it blew it bulb one day. Stopped at parts store on way home and went to check to see if it was front or rear and they both burnt and no hyper flash. It also randomly decides to work and not work. Is there maybe a main connector that is known for issues? Also has or is supposed to have the GDE eco tune if it matters

The ECM is a pretty robust component so rather first re-plug the connectors on it with battery disconnected. I would also re-plug the connectors on the BCM/Junction block and the plug on the rear of the cluster.

You can excersize the cluster by holding in the Odo meter reset pin while turning the ignition ON....the lights will all light up and the gauges will swing around. This is not too much help if the fault is intermittant.

Any issue with turn signals/stop lamps etc. are often corroded bulb holders in the cluster so it is worth cleaning corrosion off them or replacing them...the grounds to these bulb holder soften go missing.

The later KJs have a common module that sits in the centre of the engine bay...this is the "gateway" module which basically send the PCI or CAN data to the various other components...check this module is clean and dry

Bad batteries, bad battery connections on the battery as well as where the ground strap goes to ground and the earthing strap going from the engine to the chassis can also cause problems.


Try and solve the problem one by one as you have too many different issue going on here.
Any issue that "dings" and lights up things like oil pressure should post an OBDII code which you need to have read out.

If you have a 2006 CRD there is a known issue of where the harness goes behind the fuel filter head mounting plate the mounting plate can cut into the wires in that area and cause shorts to the chassis.

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2002 Export CRD 2.5 Sport

Hope you get it figured out so I can learn from it too. My oil light and water in fuel light are both acting goofy and new sensors for both didn't fix anything. Whatever your problem is, I bet it's the same for me.

BTW, I also have the GDE tune. Maybe I'll put a call in and see if he's had any problems like this, though you would think with as many fellas here having the same tune it would have reared it's ugly head by now...

A very common cause of weird electrical issues on modern heavily computerized vehicles is the battery. While loose or corroded terminal connections or bad grounds are possible it's also likely that if your battery has any age on it for it to be weak on output voltage even when running. If that's the case strange things can happen; in my case and stoutdog's weird fuel gauge readings. I'd strongly recommend having the battery and alternator checked out preferably at a battery store like Interstate.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Those sensors are routed through the J1850 to CAN bus conversion module (gateway). It is located below/behind left front headlamp and is steel about 5x5 inches square and 1 inch deep. Undo the connectors and check for corrosion or debris. It is in a bad spot for water intrusion.

Hopefully this will fix the gauge dropping out from time to time.

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Providers of wholly developed aftermarket solutions for the KJ CRD.
(248) 977 - 9531

Good to know. Clean and reassemble with a bit of dielectric grease to prevent future problems. Hope that works.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

I looked for this and had a hard time finding it. By left side I assume you mean drivers side head lamp? Do you need to remove the light to get to it?

you location is good. Look down a little lower from the headlamp and remove the CAC hose for better access.

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Providers of wholly developed aftermarket solutions for the KJ CRD.
(248) 977 - 9531