DTC U3003-16 (Electric Brake Booster Control Unit)

WARNING: This page is about a different car, the 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, and 2018 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

DTC U3003-16 : Brake Booster Control Unit Power Circuit (+B) Low Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTC Description	DTC	Freeze Frame
U3003-16 Brake Booster Control Unit Power Circuit (+B) Low Voltage

DTC (Electric brake booster)

Problem verification

-1. Turn the vehicle to the ON mode.

-2. Clear the DTC with the HDS.

-3. Turn the vehicle to the OFF (LOCK) mode, then wait 5 seconds or more.

NOTE: Do not open and close the driver's door.

-4. Turn the vehicle to the ON mode.

-5. Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame
U3003-16 Brake Booster Control Unit Power Circuit (+B) Low Voltage

Is DTC U3003-16 indicated?

YES

The failure is duplicated. Go to step 2.

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

Fuse check
-1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

-2. Wait for 3 minutes.

NOTE: Do not close the driver's door.

-3. Check the following fuse.

Fuse No. A2-4

Is the fuse OK?

YES

The fuse is OK. Reinstall the fuse, then go to step 3.

NO

Replace the fuse. If the fuse blows again, repair a short to body ground in the No. A2-4 fuse circuit.

Open wire check (+B BOOSTER MTR line)

-1. Disconnect the following connector.

Electric brake booster 26P connector

-2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Electric brake booster 26P connector: disconnected
Test point 1	Electric brake booster 26P connector No. 2
Test point 2	Body ground

Is there battery voltage?

YES

Check for loose terminals and poor connections in the electric brake booster 26P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric brake booster .

Repair an open in the wire between the electric brake booster and the under-hood fuse/relay box.