Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC U0155-00 (Adaptive Cruise Control Unit) (2014 2015 2016 2017)
DTC U0155-00 : Lost Communication With the Gauge Control Module
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| U0155-00 Lost Communication With the Gauge Control Module |
DTC (ACC)
- 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 U0029-00 CAN Gateway F-CAN ch A Bus Off U0047-00 CAN Gateway F-CAN ch B Bus Off U0056-00 CAN Gateway F-CAN ch C Bus Off U3000-49 CAN Gateway Internal Failure Is DTC U0029-00, U0047-00, U0056-00, and/or U3000-49 indicated?
YES
Go to the indicated DTCs troubleshooting.
NO
Go to step 2.
- F-CAN circuit communication check
-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
Which result is indicated?
Gauge control module is Not Available
Go to step 3.
ACC unit (Bus B) is Not Available
Go to step 4.
ACC unit (Bus C) is Not Available
Go to step 5.
ACC unit and gauge control module are Detected
Intermittent failure, the system is OK at this time.
- Open wire check (F-CAN A_L, F-CAN A_H lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connectors.
CAN gateway 24P connector Gauge control module connector A (32P) -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected Gauge control module connector A (32P): disconnected Test circuit F-CAN A_L Test point 1 CAN gateway 24P connector No. 15 (PNK) Test point 2 Gauge control module connector A (32P) No. 28 (PNK) Test circuit F-CAN A_H Test point 1 CAN gateway 24P connector No. 14 (BLU) Test point 2 Gauge control module connector A (32P) No. 27 (BLU) Is there continuity?
YES
Check for loose terminals in the CAN gateway 24P connector and the gauge control module connector A (32P). If they are OK, substitute a known-good gauge control module , then retest. If DTC U0155-00 is not indicated after substitution, replace the original gauge control module .
NO
Repair an open in the wire between the gauge control module and the CAN gateway.
- Open wire check (F-CAN B_L, F-CAN B_H lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connectors.
CAN gateway 24P connector ACC unit 20P connector -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected ACC unit 20P connector: disconnected Test circuit F-CAN B_L Test point 1 CAN gateway 24P connector No. 10 (GRY) Test point 2 ACC unit 20P connector No. 13 (GRY) Test circuit F-CAN B_H Test point 1 CAN gateway 24P connector No. 11 (LT BLU) Test point 2 ACC unit 20P connector No. 2 (LT BLU) Is there continuity?
YES
The F-CAN B_L and F-CAN B_H wires are OK. Go to step 6.
NO
Repair an open in the wire between the ACC unit and the CAN gateway.
- Open wire check (F-CAN C_L, F-CAN C_H lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connectors.
CAN gateway 24P connector ACC unit 20P connector -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected ACC unit 20P connector: disconnected Test circuit F-CAN C_L Test point 1 CAN gateway 24P connector No. 8 (PNK) Test point 2 ACC unit 20P connector No. 15 (PNK) Test circuit F-CAN C_H Test point 1 CAN gateway 24P connector No. 9 (PUR) Test point 2 ACC unit 20P connector No. 4 (PUR) Is there continuity?
YES
The F-CAN C_L and F-CAN C_H wires are OK. Go to step 6.
NO
Repair an open in the wire between the ACC unit and the CAN gateway.
- ACC unit check (update)
-1. Reconnect the following connectors.
CAN gateway 24P connector ACC unit 20P connector -2. Update the ACC unit if it does not have the latest software .
-3. Turn the vehicle to the OFF (LOCK) mode.
-4. Turn the vehicle to the ON mode, then wait for at least 5 seconds.
-5. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame Is DTC U0155-00 indicated?
YES
Check for loose terminals in the ACC unit 20P connector. If the ACC unit was updated and the symptom/indication is still present, replace the ACC unit .
NO
Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTC's troubleshooting.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.