DTC U0101-00, U0104-00, U0122-00, U0126-00, U0151-00, U0155-00, U017E-00, U017F-00 (E-Pretensioner Unit) (2018 2019 2020)

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2020 Acura RLX, 2019 Acura RLX, 2018 Acura RLX, 2017 Acura RLX, and 2016 Acura RLX. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0101-00 : Lost Communication With the PCM
DTC U0104-00 : Lost Communication With the Driving Support System Control Unit
DTC U0122-00 : Lost Communication With the VSA Modulator-Control Unit
DTC U0126-00 : Lost Communication With the Steering Angle Sensor
DTC U0151-00 : Lost Communication With the SRS Unit
DTC U0155-00 : Lost Communication With the Gauge Control Module
DTC U017E-00 : Lost Communication with the Another Side E-Pretensioner Unit
DTC U017F-00 : Lost Communication with the Another Side E-Pretensioner Unit

NOTE:

Before doing this troubleshooting procedure, review General Troubleshooting Information .
According to the detected DTC (s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the E-pretensioner unit.

Left Side E-Pretensioner Unit

DTC Description	DTC
U0101-00 Lost Communication With the PCM
U0104-00 Lost Communication With the Driving Support System Control Unit
U0122-00 Lost Communication With the VSA Modulator-Control Unit
U0126-00 Lost Communication With the Steering Angle Sensor
U0151-00 Lost Communication With the SRS Unit
U0155-00 Lost Communication With the Gauge Control Module
U017E-00 Lost Communication with the Another Side E-Pretensioner Unit

Right Side E-Pretensioner Unit

DTC Description	DTC
U0101-00 Lost Communication With the PCM
U0104-00 Lost Communication With the Driving Support System Control Unit
U0122-00 Lost Communication With the VSA Modulator-Control Unit
U0126-00 Lost Communication With the Steering Angle Sensor
U0151-00 Lost Communication With the SRS Unit
U0155-00 Lost Communication With the Gauge Control Module
U017F-00 Lost Communication with the Another Side E-Pretensioner Unit

DTC (E-pretensioner)

CAN gateway system DTC check

-1. Turn the vehicle to the ON mode.

-2. Check for CAN gateway system DTCs with the HDS.

DTC Description	DTC

Are any DTCs indicated?

YES

Go to the troubleshooting for CAN gateway system DTC (s) .

Go to step 2.

F-CAN circuit communication check (Receiving control unit)
-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

F-CAN Bus Connected Unit Check

Does the CAN gateway detect the E-pretensioner Bus channel C?

U017F-00: Bus C is Not Available

Go to step 3.

U017E-00: Bus C is Not Available

Go to step 4.

Bus C is Available

Go to step 5.

Open wire check (F-CAN C_H, F-CAN C_L lines)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connectors.

E-pretensioner unit connector A (16P)

CAN gateway 16P connector

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	E-pretensioner unit connector A (16P): disconnected
	CAN gateway 16P connector: disconnected
Test point 1	E-pretensioner unit connector A (16P) No. 12
Test point 2	CAN gateway 16P connector (female terminals) No. 5:

Test point 1	E-pretensioner unit connector A (16P) No. 13
Test point 2	CAN gateway 16P connector (female terminals) No. 13:

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The F-CAN C_H wire and the F-CAN C_L wire are OK. Check for poor connections or loose terminals at the CAN gateway and the E-pretensioner unit. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, Replace the E-pretensioner unit .

Repair an open in the F-CAN C_H wire or the F-CAN C_L wire between the CAN gateway and the E-pretensioner unit.

Open wire check (F-CAN C_H, F-CAN C_L lines)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connectors.

E-pretensioner unit connector B (14P)

CAN gateway 16P connector

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	E-pretensioner unit connector B (14P): disconnected
	CAN gateway 16P connector: disconnected
Test point 1	E-pretensioner unit connector B (14P) No. 10
Test point 2	CAN gateway 16P connector (female terminals) No. 5:

Test point 1	E-pretensioner unit connector B (14P) No. 11
Test point 2	CAN gateway 16P connector (female terminals) No. 13:

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Repair an open in the F-CAN C_H wire or the F-CAN C_L wire between the CAN gateway and the E-pretensioner unit.

F-CAN circuit communication check (Transmitting control unit)

-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

F-CAN Bus Connected Unit Check

According to the detected DTC on the following table, make sure that the transmitting control unit detects the CAN gateway Bus channel (s) normally.

DTC	Transmitting control unit	Detected CAN gateway Bus channel (s) at normal
U0101-00	PCM	A, D
U0104-00	Multipurpose camera unit	C
U0122-00	VSA modulator-control unit	B, C
U0126-00	Steering angle sensor	C
U0151-00	SRS unit	C

DTC	Transmitting control unit	Detected CAN gateway Bus channel (s) at normal
U0155-00	Gauge control module	A

Is it detected normally?

Detected normal

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control unit and the CAN gateway.

U0101-00: PCM is Not Available for Bus A

Go to step 6.

U0101-00: PCM is Not Available for Bus D

Go to step 9.

U0104-00: Multipurpose camera unit is Not Available for Bus C

Go to step 8.

U0122-00: VSA modulator-control unit is Not Available for Bus B

Go to step 7.

U0122-00: VSA modulator-control unit is Not Available for Bus C

Go to step 8.

U0126-00: Steering angle sensor is Not Available for Bus C

Go to step 8.

U0151-00: SRS unit is Not Available for Bus C

Go to step 8.

U0155-00: Gauge control module is Not Available for Bus A

Go to step 6.

Open wire check (F-CAN A_H line, F-CAN A_L line)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. According to the detected DTC on the following table, disconnect the transmitting control unit connector (s).

DTC	Connector
-	CAN gateway 16P connector
U0101-00	PCM connector A (51P)
U0155-00	Gauge control module connector A (32P)

NOTE: Before disconnecting the PCM connector A (51P), jump the SCS line with the HDS, and wait more than 1 minute.

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	Transmitting control unit connector (s) for indicated DTCs: disconnected

DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0101-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (51P)	No. 9
U0101-00	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11	PCM connector A (51P)	No. 10
U0155-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	Gauge control module connector A (32P) (female terminals):	No. 27
U0155-00	F-CAN A_L	CAN gateway 16P connector (female terminals):	No. 11	Gauge control module connector A (32P) (female terminals):	No. 28

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The F-CAN A_H wire and the F-CAN A_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.

According to the detected DTC on the following table, substitute or replace the correspond control unit.

DTC	Operation for transmitting control unit
U0101-00	Check for poor connections or loose terminals at the CAN gateway and the PCM. Substitute a known-good PCM , then recheck. If DTC U0101-00 goes away and the PCM was substituted, replace the original PCM .
U0155-00	Check for poor connections or loose terminals at the CAN gateway and the gauge control module. Substitute a known-good gauge control module , then recheck. If DTC U0155-00 goes away and the gauge control module was substituted, replace the original gauge control module .

Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the transmitting control unit and the CAN gateway.

Open wire check (F-CAN B_H line, F-CAN B_L line)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. According to the detected DTC on the following table, disconnect the transmitting control unit connector (s).

DTC	Connector
-	CAN gateway 16P connector
U0122-00	VSA modulator-control unit 38P connector

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	Transmitting control unit connector (s) for indicated DTCs: disconnected

DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0122-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 38P connector	No. 38
U0122-00	F-CAN B_L	CAN gateway 16P connector (female terminals):	No. 14	VSA modulator-control unit 38P connector	No. 26

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The F-CAN B_H wire and the F-CAN B_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.

According to the detected DTC on the following table, substitute or replace the correspond control unit.

DTC	Operation for transmitting control unit
U0122-00	Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit .

Repair an open in the F-CAN B_H wire or the F-CAN B_L wire between the transmitting control unit and the CAN gateway.

Open wire check (F-CAN C_H line, F-CAN C_L line)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. According to the detected DTC on the following table, disconnect the transmitting control unit connector (s).

DTC	Connector
-	CAN gateway 16P connector
U0104-00	Multipurpose camera unit 20P connector
U0122-00	VSA modulator-control unit 38P connector
U0126-00	Steering angle sensor 4P connector
U0151-00	SRS unit connector A (39P)

NOTE: Before disconnecting SRS unit connector A (39P), disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	Transmitting control unit connector (s) for indicated DTCs: disconnected

DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0104-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	Multipurpose camera unit 20P connector	No. 2
U0104-00	F-CAN C_L	CAN gateway 16P connector (female terminals):	No. 13	Multipurpose camera unit 20P connector	No. 13
U0122-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	VSA modulator-control unit 38P connector	No. 31
U0122-00	F-CAN C_L	CAN gateway 16P connector (female terminals):	No. 13	VSA modulator-control unit 38P connector	No. 20
U0126-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	Steering angle sensor 4P connector (female terminals):	No. 2
U0126-00	F-CAN C_L	CAN gateway 16P connector (female terminals):	No. 13	Steering angle sensor 4P connector (female terminals):	No. 3
U0151-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	SRS unit connector A (39P)	No. 20
U0151-00	F-CAN C_L	CAN gateway 16P connector (female terminals):	No. 13	SRS unit connector A (39P)	No. 21

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The F-CAN C_H wire and the F-CAN C_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.

According to the detected DTC on the following table, substitute or replace the correspond control unit.

DTC	Operation for transmitting control unit
U0104-00	Check for poor connections or loose terminals at the CAN gateway and the multipurpose camera unit. Replace the multipurpose camera unit .
U0122-00	Check for poor connections or loose terminals at the CAN gateway and the VSA modulator-control unit. Replace the VSA modulator-control unit .
U0126-00	Check for poor connections or loose terminals at the CAN gateway and the steering angle sensor. Substitute a known-good steering angle sensor , then recheck. If DTC U0126-00 goes away and the steering angle sensor was substituted, replace the original steering angle sensor .
U0151-00	Check for poor connections or loose terminals at the CAN gateway and the SRS unit. Substitute a known-good SRS unit , then recheck. If DTC U0151-00 goes away and the SRS unit was substituted, replace the original SRS unit .

Repair an open in the F-CAN C_H wire or the F-CAN C_L wire between the transmitting control unit and the CAN gateway.

Open wire check (F-CAN D_H line, F-CAN D_L line)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. According to the detected DTC on the following table, disconnect the transmitting control unit connector (s).

DTC	Connector
-	CAN gateway 16P connector
U0101-00	PCM connector A (51P)

NOTE: Before disconnecting the PCM connector A (51P), jump the SCS line with the HDS, and wait more than 1 minute.

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	Transmitting control unit connector (s) for indicated DTCs: disconnected

DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
DTC	Circuit name	Connector	Terminal	Connector	Terminal
U0101-00	F-CAN D_H	CAN gateway 16P connector (female terminals):	No. 7	PCM connector A (51P)	No. 11
U0101-00	F-CAN D_L	CAN gateway 16P connector (female terminals):	No. 15	PCM connector A (51P)	No. 12

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

The F-CAN D_H wire and the F-CAN D_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting.

According to the detected DTC on the following table, substitute or replace the correspond control unit.

DTC	Operation for transmitting control unit
U0101-00	Check for poor connections or loose terminals at the CAN gateway and the PCM. Substitute a known-good PCM , then recheck. If DTC U0101-00 goes away and the PCM was substituted, replace the original PCM .

Repair an open in the F-CAN D_H wire or the F-CAN D_L wire between the transmitting control unit and the CAN gateway.