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.
2021 Honda Pilot EX, FWDFACTORY OEM SERVICE PROCEDURE
Power Windows DTCS
POWER WINDOWS DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B1125 | Driver's power window motor A pulse malfunction | Signal error |
| B1126 | Driver's power window motor B pulse malfunction | Signal error |
| B1127 | Driver's door lock key cylinder switch malfunction | Signal error |
| B1128 | Driver's door lock switch malfunction | Signal error |
| B1129 | Driver's door lock knob switch malfunction | Signal error |
| B1130 | Front passenger's power window motor A pulse malfunction | Signal error |
| B1131 | Front passenger's power window motor B pulse malfunction | Signal error |
| B1140 | Driver's power window position detect circuit malfunction | Signal error |
| B1142 | Power Window Master Switch lost communication with front passenger's power window switch (UART line open) |
Loss of communication |
| B1145 | Front passenger's power window position detect circuit malfunction | Signal error |
| U0164 - Refer to: DTC Troubleshooting: U0164, U1281, U128D (Multiplex Control Unit, Door) (2016 2017 2018) or DTC Troubleshooting: U0164, U1281, U128D (Multiplex Control Unit, Door) (2019 2020 2021) . |
Power Window Master Switch lost communication with climate control unit | Loss of communication |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U1281 - Refer to: DTC Troubleshooting: U1281, U0164, U128D (Multiplex Control Unit, Door) (2016 2017 2018) or DTC Troubleshooting: U1281, U0164, U128D (Multiplex Control Unit, Door) (2019 2020 2021) . |
Power Window Master Switch lost communication with MICU | Loss of communication |
| U128D - Refer to: DTC Troubleshooting: U128D, U0164, U1281 (Multiplex Control Unit, Door) (2016 2017 2018) or DTC Troubleshooting: U128D, U0164, U1281 (Multiplex Control Unit, Door) (2019 2020 2021) . |
Power Window Master Switch lost communication with gauge control module | Loss of communication |
Factory Service Tools
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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.
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