What this code means
B1175 may indicate that the gauge control module is seeing a possible malfunction in the fuel level sensor circuit.
What the vehicle may do
- The fuel gauge may read inaccurately.
- The fuel level display may respond intermittently or abnormally.
- The concern may be intermittent if the code does not return after clearing.
Possible fault areas
- Possible wiring trouble in the fuel gauge sender circuit.
- Possible loose, poor, or intermittent connector contact.
- Possible fuel gauge sending unit fault.
- Possible gauge control module fault after the circuit and sending unit check OK.
Diagnostic path
Opening context
B1175 on this 2010 to 2017 Honda Accord with the 2.4 gas engine is a fuel level sensor circuit malfunction seen by the gauge control module. In plain terms, the module may not be seeing the fuel level sender circuit the way it expects. The vehicle may have an inaccurate fuel gauge, a gauge that does not respond normally, or an intermittent fuel level display concern. The possible fault areas are the fuel gauge sender circuit wiring, connector fit or terminal condition, the fuel gauge sending unit, and, after the circuit and sender check good, the gauge control module. If other codes are present, sort out the multiple-code path first so you are not chasing this one out of order.
Confirm the code resets
Start by confirming the fault. Clear the DTCs with the HDS. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode. Then turn the ignition switch to ON (II), or select the ON mode, and wait more than 30 seconds. Recheck for DTCs with the HDS. If B1175 comes back, move into circuit testing. If B1175 does not return, treat it as an intermittent failure for now; the system is OK at this time, and the next thing to look for is loose or poor connections.
Check the FUEL GAGE+ circuit for an open
With the code confirmed, check the FUEL GAGE+ line. Turn the ignition switch to LOCK (0), or select OFF mode. Disconnect gauge control module connector A (32P), and disconnect the fuel gauge sending unit 4P connector. Now check continuity between gauge control module connector A (32P) No. 22, the GRY wire, and fuel gauge sending unit 4P connector No. 2, also the GRY wire. If you have continuity, the FUEL GAGE+ wire is OK and you continue to the next circuit. If there is no continuity, repair the open or high resistance in that wire.
Check the FUEL GAGE- circuit for an open
Next, check the FUEL GAGE- line with the same connectors still disconnected and the ignition in LOCK (0) or OFF mode. Check continuity between gauge control module connector A (32P) No. 21, the TAN wire, and fuel gauge sending unit 4P connector No. 4, also the TAN wire. If continuity is present, the FUEL GAGE- wire is OK and the diagnosis moves to the sending unit. If there is no continuity, repair the open or high resistance in that wire.
Check the fuel gauge sending unit
Once both the FUEL GAGE+ and FUEL GAGE- circuits have passed the continuity checks, test the fuel gauge sending unit. If the sending unit is not OK, replace the fuel gauge sending unit. If the sending unit is OK, the circuit and sender have been ruled out in this path, and the next supported repair is to replace the gauge control module.
Takeaway
The logic for B1175 is straightforward: confirm the code, check the two sender circuit wires for opens or high resistance, then test the fuel gauge sending unit before condemning the gauge control module. For more diagnostic training, visit stepdiagnostics.com.
Final check
This code is often approached by confirming the fault first, then checking the sender circuit wiring, the sending unit, and finally the gauge control module only after the earlier checks pass.
For more guided automotive diagnostics, visit STEP Diagnostics.
