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Old 12-16-2015, 03:49 PM
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KJ 2.8 CRD Electrical / Code diagnostic required

KJ 2.8 CRD P2120 Code
Hello Team, I would greatly appreciate some technical assistance as to how to fix a problem I have with My 2004 KJ 2.8 CRD

It randomly (no warning whatsoever) loses accelerator function at any time whilst driving (sometimes twice in a day, sometimes not for months, but more often lately) - The motor will have no accelerator response whatsoever and goes to a fast idle (about 1300 rpm) I assume this is a 'Safe Mode' but cant be sure. Orange Check Engine Light Came up the first time it did this.
Truck is in very good condition and drives ok so not like a junker.
When I stop, turn the key of and restart, the engine goes back to normal and full use of the accelerator is available

I checked the codes with the turning the key trick and got
P1685
P1652
P2120
P0836

My garage guy could not get any info on what these codes meant (I am in New Zealand) so could not help me further

I took the Truck into the Jeep dealers here (who are very expensive by reputation - Andrew Simms) and got them to check the codes, and try to assess what the cause was. But I did ask for them not to waste too much time trying to find the cause unless they knew specifically what the problem was as I don't have a lot of money.
After they broke the internals of my key mechanism and charged me $900 to replace it, they said they could not find the issue without spend a whole lot of time on it.
I got the truck back with cleared codes though, so at least I got something eh. The Mechanic said he was trying to trace the wiring through to a Skim error according to the codes.

Anyway, two days later, same thing, no accelerator and orange engine light lit up.
I was able to check the codes after that occurrence. P2120

So now.....What does this mean?
And what exactly can I do to stop this thing from reoccurring?

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  #2  
Old 12-16-2015, 07:59 PM
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Re: KJ 2.8 CRD Electrical / Code diagnostic required

Not familiar with your jeep, but the fault code is for a throttle/pedal position sensor circuit.
So i would check where this sensor is (most probably on the throttle body) and check the wiring to this sensor first. Also check the connector pins for moisture or corrosion and clean them with electrical contact cleaner. A good change that the sensor needs to be changed.
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Old 12-16-2015, 08:35 PM
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Re: KJ 2.8 CRD Electrical / Code diagnostic required

Thanks Fango, yes I have seen thread referring to the 'acc Pedal Position Sensor 1 Circuit Voltage too high - Low - Plausibility with Brake switch' was just uncertain as to verify this and where these things are.

Will trace wiring through, perhaps look for You Tube videos to?

My Jeep is a 2004 2.8L Diesel, they are called Cherokee here and followed the XJ. They are called Liberty in USA
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Old 12-16-2015, 08:46 PM
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Re: KJ 2.8 CRD Electrical / Code diagnostic required

I tried to add a Photo but the thread turned it into a whole lot of code :-(
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