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 EliteFACTORY 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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