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Rad fan ALWAYS ON w/o apparent reason!

bmbelo

Member
First Name
Bruno
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Location
France
Vehicle(s)
JLUR 2018
For the life of me I cannot get the bloody gremlin.... Hoping somebody may be able to help somehow.

So:

1. Droped the Jeep ('18 2.2D EUR JLUR) at a renowned french "preparateur" for 2nd fuel tank and AUX switches installation. The car was left w/ batts topped up and OK, no issues whatsoever.

2. Got the car back one week later to find the radiator fan ALWAYS ON. So always on means exactly that, independently if AC is on or off, hot or cold outside...once I start the engine in the morning it starts spooling up.

3. Recharged both batteries - they don't seem to be bad, at least according to JSCan Live Data readings. Couldn't get a multimeter to them yet though...

I attach the PCM and BCM live data for temperatures and voltages.

The only thing suspicious I see is the IBS - which seems fried, and thus I get the corresponding DTC + the default battery temperature value.

Error codes reported by JSCan in PCM / BCM / Generic:

----------------//-------------------

VIN: 1C4HJXFU6JWxxxxxx
Platform: JL
Date: 17/11/2024

------------------------------
GENERIC
------------------------------
#P0480
cooling fan 1 control
active

=> This is obvious...PCM requests fan ON, but why?! Which criteria/surveillance sets this DTC? Can't find this information....

------------------------------
BODY CONTROLLER
------------------------------

#U113E-00
lost communication with intelligent battery sensor ""a""-
lost communication with intelligent battery sensor-
active

=> Network comm issue, bad sensor or network

------------------------------
POWERTRAIN CONTROL
------------------------------
#P0516-00
battery temperature sensor circuit low-
active

=> Network comm issue, bad sensor or network

----------------//-------------------

Anyone out here with experience w/ this sort of failure/strange behaviour? I do not believe the IBS/LIN issue can cause it, doesn't make much sense to me....

Any hints or tips?

Thank you for your help!

Jeep Wrangler JL Rad fan ALWAYS ON w/o apparent reason! Screenshot_20241117-104437
Jeep Wrangler JL Rad fan ALWAYS ON w/o apparent reason! Screenshot_20241117-103954
Jeep Wrangler JL Rad fan ALWAYS ON w/o apparent reason! Screenshot_20241117-103823
Jeep Wrangler JL Rad fan ALWAYS ON w/o apparent reason! Screenshot_20241117-104112
Jeep Wrangler JL Rad fan ALWAYS ON w/o apparent reason! Screenshot_20241117-104234
Jeep Wrangler JL Rad fan ALWAYS ON w/o apparent reason! Screenshot_20241117-103954
Jeep Wrangler JL Rad fan ALWAYS ON w/o apparent reason! Screenshot_20241117-103823
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bmbelo

Member
First Name
Bruno
Joined
Nov 5, 2021
Threads
6
Messages
24
Reaction score
6
Location
France
Vehicle(s)
JLUR 2018
Already done. Cleared the codes numerous times, often the only remaining "active" is the IBS one... Reseted the IBS, disconnected all batterie cables, tried coding "no ibs" via JScan to no avail.
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