Some 2020-2022 Ford F-Super Duty vehicles may exhibit a condition where the engine will not turn off. Other various electrical issues may be present at times including a dead battery, horn stays on and no crank/no start.
The ABS indicator may be on, with DTCs C0020 and U3003 in the ABS module. This may be the result of water/moisture intrusion into the BJB (battery junction box).
This intrusion may be related to the BJB cover not installed properly and/or broken cover tabs. Replace the cover if tabs/hold-down fingers are damaged.
Covers are available as P/N LC3Z-14A003-D.
If water intrusion into the BJB is verified, replace the BJB with P/N 14A068. Refer to the parts catalog for specific VIN applications.
1. Remove the battery and battery tray.
2. Remove the BJB cover.
3. Loosen the two BJB connector bolts and remove the battery power cable nut. Disconnect the battery power cable from the BJB.
4. Release the BJB from the two locking tabs on each side of the BJB.
5. Lift the BJB to allow access to both BJB connectors. Disconnect both connectors and remove the BJB.
6. Remove the cover from the new BJB and connect both connectors to the BJB.
7. Install the new BJB into both locking tabs.
8. Attach the battery power cable and tighten the cable nut to 93 in-lb. Tighten the connector bolts to 48 in-lb.
9. Install new fuses/relays as needed.
10. Install the new cover making sure that the tabs/fingers are installed correctly.
11. Complete by installing the battery tray, a charged battery and cables.
