What this code means
U0151-00 may mean the multipurpose camera unit cannot communicate with the SRS unit over the vehicle network.
What the vehicle may do
- The vehicle may show warning indicators.
- Driver-assist or SRS-related behavior may be affected depending on vehicle configuration.
- The code can return after clearing if the communication fault is still present.
Possible fault areas
- Possible F-CAN wiring or connector terminal concerns between the multipurpose camera unit and SRS unit.
- Possible SRS unit communication concern.
- Possible multipurpose camera unit software or unit concern.
Diagnostic path
Opening context
On this CR-V, U0151-00 means the multipurpose camera unit may not be communicating with the SRS unit on the F-CAN network. In the bay, this can show up with warning indicators, driver-assist features not behaving normally, or a communication code that comes back after clearing. The possible fault areas here are the network wiring between the camera and SRS unit, connector terminal condition, SRS unit communication, and the multipurpose camera unit software or the unit itself. Before you get deep into testing, review the general troubleshooting information and start with the basic system checks.
Problem verification
Start by verifying the fault. Turn the vehicle to the ON mode, clear the DTC with the HDS, then turn the vehicle to the OFF (LOCK) mode. Turn it back to the ON mode and wait for at least 5 seconds before checking for DTCs again with the HDS. The first decision point in this path is inconsistent about which communication code it is using for the duplicate-fault check, so pause there and confirm you are staying on the correct U0151-00 diagnostic path before you continue. If the fault is not duplicated after the clear and key cycle, treat it as an intermittent. The system is OK at that time, and if captured data is available, try to reproduce the same conditions before moving on.
Check the F-CAN wires for an open
If the failure is duplicated, move to the open-wire check on the F-CAN_L and F-CAN_H circuits. Turn the vehicle to the OFF (LOCK) mode. Disconnect the multipurpose camera unit 20P connector and SRS unit connector A, 39P. With those connectors disconnected, check continuity from the multipurpose camera unit 20P connector No. 13 to SRS unit connector A, 39P, No. 21, and from the multipurpose camera unit 20P connector No. 2 to SRS unit connector A, 39P, No. 20. If the circuits have continuity, the F-CAN_L and F-CAN_H wires are OK, so continue to the SRS unit substitution step. If continuity is not present, repair the open in the wire between the multipurpose camera unit and the SRS unit.
Substitute a known-good SRS unit
With the wiring check passed, reconnect SRS unit connector A, 39P, and the multipurpose camera unit 20P connector. Substitute a known-good SRS unit. Turn the vehicle to the ON mode, clear the DTC with the HDS, then turn the vehicle to the OFF (LOCK) mode. Turn it back to the ON mode, wait for at least 5 seconds, and check for DTCs with the HDS. If U0151-00 is still indicated, continue to the multipurpose camera unit software check. If U0151-00 is no longer indicated after the known-good SRS unit is installed, replace the SRS unit.
Check the multipurpose camera unit software
Next, check the multipurpose camera unit software. If it does not have the latest software, update it. After the update check or update is done, turn the vehicle to the OFF (LOCK) mode, then back to the ON mode. Wait for at least 5 seconds and check for DTCs with the HDS. If U0151-00 is still indicated, check for loose terminals in the multipurpose camera unit 20P connector. If the multipurpose camera unit was updated and the symptom or indicator is still present, replace the multipurpose camera unit.
Verify the repair
Keep verification separate from the circuit and unit checks. After the repair path is complete, check again with the HDS and confirm U0151-00 stays gone. If other codes are present, check what they mean next instead of folding them into this U0151-00 diagnosis. Bottom line: prove the fault, prove the F-CAN wiring, then use the known-good SRS unit and camera software check to decide where the communication loss is coming from. For more diagnostic training, visit stepdiagnostics.com.
Final check
A clean diagnosis often comes from confirming the fault first, checking the network wiring, then using the specified substitution and software checks before deciding on the failed area.
For more guided automotive diagnostics, visit STEP Diagnostics.
