DTC Error Code - FCM U3820

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Apr 17, 2012 | 09:26 AM

Tank29

Thread Starter

JK Newbie

Joined: Jun 2008

Posts: 23

Likes: 0

From: Watsontown, PA

DTC Error Code - FCM U3820

I am getting the following DTC code and I can not figure out what it is...Any ideas???

DTC Error Code - FCM U3820

Apr 17, 2012 | 09:37 AM

Alias

JK Enthusiast

Joined: Oct 2008

Posts: 136

Likes: 0

From: Manassas, Virginia

Quote:

Originally Posted by Tank29

U3820

I was unable to find that specific code, but it has something to do with Network, as designated by the 'U', and i'm not sure what the 2nd integer is supposed to dictate 3?.

Code:

The 1st digit indicates: 
B - Body
C - Chassis
P - Power Train
U - Network

The 2nd digit indicates:
0 - SAE
1 - MFG 

The 3rd digit indicates:
1 - Fuel & Air Metering
2 - Fuel & Air Metering (Injector Circuit)
3 - Injection Systems or Misfire
4 - Auxiliary Emissions Control
5 - Vehicle Speed Control& Idle Control System
6 - Computer Output Circuit
7 - Transmission
8 - Transmission

Apr 17, 2012 | 09:46 AM

ronjenx

JK Jedi Master

Joined: Feb 2008

Posts: 12,907

Likes: 185

From: Maine

Quote:

Originally Posted by Tank29

I am getting the following DTC code and I can not figure out what it is...Any ideas???

DTC Error Code - FCM U3820

Code U3820 doesn't appear in the 2008 JK service manual. (A search didn't find it).
People have reported odd codes being logged for no apparent reason.

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