What this code means
U0131 may mean the gauge control module is not communicating as expected with the EPS unit.
What the vehicle may do
- The vehicle may show steering-related warnings.
- The gauge cluster may show warning light behavior.
- Other network communication symptoms can also be present.
Possible fault areas
- Possible ignition feed or fuse circuit issue.
- Possible F-CAN wiring or connector issue between the EPS unit and gauge control module.
- Possible module-side fault after power and communication wiring checks pass.
Diagnostic path
Opening context
On a 2010-2015 Honda Civic with the 1.8 L engine, U0131 is a communication code between the gauge control module and the EPS unit. In plain terms, the cluster side is not getting the expected communication from the electric power steering side. The vehicle may have steering-related warnings, gauge or warning light behavior, or other network symptoms, depending on what else is happening on the car. The possible fault areas are the ignition feed to the EPS unit, the No. B24 fuse circuit, F-CAN wiring between the EPS unit and the gauge control module, connector condition, or the gauge control module itself. Before getting deep into U0131, if other loss-of-communication codes are present for the ECM or PCM, handle those first. And if the car has multiple network communication codes, do not chase this one in isolation; work through the broader network diagnosis first.
Confirm the code first
Start by proving whether U0131 is current or intermittent. Clear the DTCs with the HDS. Turn the ignition switch to LOCK, then back to ON. Wait for at least 6 seconds, then check for DTCs again with the HDS. If U0131 comes right back, continue with the circuit checks. If U0131 does not return, treat it as an intermittent failure for now. The system is OK at this time, so focus on loose or poor connections instead of replacing parts.
Check the EPS ignition feed fuse
Next, check fuse No. B24, rated at 7.5 A, in the under-dash fuse and relay box. If that fuse is OK, keep moving forward to the power feed check at the EPS control unit. If the fuse is not OK, replace the fuse. If it blows again, repair a short to ground in the No. B24 7.5 A fuse circuit before going any farther.
Check the IG1_VSA/ABS feed at the EPS unit
Now check for an open or high resistance in the ignition feed to the EPS control unit. Turn the ignition switch to LOCK. Disconnect EPS control unit connector A, the 11P connector. Turn the ignition switch back to ON. Measure voltage between terminal No. 9, the gray wire, at EPS control unit connector A, and body ground. The test condition here is ignition ON, EPS connector A disconnected, on the IG1_VSA/ABS circuit. If you have battery voltage there, the feed is present and you move to the F-CAN wiring check. If you do not have battery voltage, repair an open or high resistance in that wire.
Check the F-CAN wires between the EPS unit and gauge control module
With the power feed checked, move to the communication lines. Turn the ignition switch to LOCK. Disconnect the gauge control module tach 32P connector. With EPS control unit connector A still disconnected and the gauge control module tach 32P connector disconnected, check continuity on both F-CAN wires. Check F-CAN-H between gauge control module connector No. 19, white wire, and EPS control unit connector A No. 10, white wire. Then check F-CAN-L between gauge control module connector No. 20, red wire, and EPS control unit connector A No. 11, red wire. If there is continuity, the diagnostic path calls for replacing the gauge control module tach. If there is not continuity, you are looking for an open or poor connection in the F-CAN wiring between the EPS control unit and the gauge control module tach.
Verification and takeaway
After the repair, verify the repair and confirm the code stays gone. The key on this one is to stay in order: confirm the code, check the 7.5 A fuse circuit, prove the EPS ignition feed, then prove the F-CAN wiring before condemning a module. For more diagnostic training, visit stepdiagnostics.com.
Final check
This diagnosis often comes down to confirming whether the code is current, then separating a power feed problem from a communication wiring problem before judging the module.
For more guided automotive diagnostics, visit STEP Diagnostics.
