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 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code (DTC): List
| Code | Description & trouble part | Reference |
|---|---|---|
| B2B00 | DRIVER'S DOOR POWER WINDOW AUTO SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B00 DRIVER'S DOOR POWER WINDOW AUTO SWITCH STUCK . |
| B2B01 | DRIVER'S DOOR POWER WINDOW MANUAL UP SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B01 DRIVER'S DOOR POWER WINDOW MANUAL UP SWITCH STUCK . |
| B2B02 | DRIVER'S DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B02 DRIVER'S DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK . |
| B2B03 | DRIVER'S DOOR POWER WINDOW PULSE1 AND 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B03 DRIVER'S DOOR POWER WINDOW PULSE1 AND 2 NO SIGNAL . |
| B2B04 | DRIVER'S DOOR POWER WINDOW PULSE 1 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B04 DRIVER'S DOOR POWER WINDOW PULSE 1 NO SIGNAL . |
| B2B05 | DRIVER'S DOOR POWER WINDOW PULSE 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B05 DRIVER'S DOOR POWER WINDOW PULSE 2 NO SIGNAL . |
| B2B06 | DRIVER'S DOOR POWER WINDOW PULSE DIRECTION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B06 DRIVER'S DOOR POWER WINDOW PULSE DIRECTION . |
| B2B07 | DRIVER'S DOOR POWER WINDOW POSITION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B07 DRIVER'S DOOR POWER WINDOW POSITION . |
| B2B08 | DRIVER'S DOOR POWER WINDOW CONTINUOUS REVERSAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B08 DRIVER'S DOOR POWER WINDOW CONTINUOUS REVERSAL . |
| B2B09 | DRIVER'S DOOR POWER WINDOW CONTROL MODULE EEPROM | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B09 DRIVER'S DOOR POWER WINDOW CONTROL MODULE EEPROM . |
| B2B10 | PASSENGER'S DOOR POWER WINDOW DRIVER'S DOOR AUTO SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B10 PASSENGER'S DOOR POWER WINDOW DRIVER'S DOOR AUTO SWITCH STUCK . |
| B2B11 | PASSENGER'S DOOR POWER WINDOW DRIVER'S DOOR MANUAL UP SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B11 PASSENGER'S DOOR POWER WINDOW DRIVER'S DOOR MANUAL UP SWITCH STUCK . |
| B2B12 | PASSENGER'S DOOR POWER WINDOW DRIVER'S DOOR MANUAL DOWN SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B12 PASSENGER'S DOOR POWER WINDOW DRIVER'S DOOR MANUAL DOWN SWITCH STUCK . |
| B2B14 | RR DOOR POWER WINDOW DRIVER'S DOOR MANUAL UP SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B14 RR DOOR POWER WINDOW DRIVER'S DOOR MANUAL UP SWITCH STUCK . |
| B2B15 | RR DOOR POWER WINDOW DRIVER'S DOOR MANUAL DOWN SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B15 RR DOOR POWER WINDOW DRIVER'S DOOR MANUAL DOWN SWITCH STUCK . |
| B2B17 | RL DOOR POWER WINDOW DRIVER'S DOOR MANUAL UP SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B17 RL DOOR POWER WINDOW DRIVER'S DOOR MANUAL UP SWITCH STUCK . |
| B2B18 | RL DOOR POWER WINDOW DRIVER'S DOOR MANUAL DOWN SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B18 RL DOOR POWER WINDOW DRIVER'S DOOR MANUAL DOWN SWITCH STUCK . |
| B2B20 | PASSENGER'S DOOR POWER WINDOW AUTO SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B20 PASSENGER'S DOOR POWER WINDOW AUTO SWITCH STUCK . |
| B2B21 | PASSENGER'S DOOR POWER WINDOW MANUAL UP SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B21 PASSENGER'S DOOR POWER WINDOW MANUAL UP SWITCH STUCK . |
| B2B22 | PASSENGER'S DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B22 PASSENGER'S DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK . |
| B2B23 | PASSENGER'S DOOR POWER WINDOW PULSE 1 AND 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B23 PASSENGER'S DOOR POWER WINDOW PULSE 1 AND 2 NO SIGNAL . |
| B2B24 | PASSENGER'S DOOR POWER WINDOW PULSE 1 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B24 PASSENGER'S DOOR POWER WINDOW PULSE 1 NO SIGNAL . |
| B2B25 | PASSENGER'S DOOR POWER WINDOW PULSE 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B25 PASSENGER'S DOOR POWER WINDOW PULSE 2 NO SIGNAL . |
| B2B26 | PASSENGER'S DOOR POWER WINDOW PULSE DIRECTION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B26 PASSENGER'S DOOR POWER WINDOW PULSE DIRECTION . |
| B2B27 | PASSENGER'S DOOR POWER WINDOW POSITION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B27 PASSENGER'S DOOR POWER WINDOW POSITION . |
| B2B28 | PASSENGER'S DOOR POWER WINDOW CONTINUOUS REVERSAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B28 PASSENGER'S DOOR POWER WINDOW CONTINUOUS REVERSAL . |
| B2B29 | PASSENGER'S DOOR POWER WINDOW CONTROL MODULE EEPROM | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B29 PASSENGER'S DOOR POWER WINDOW CONTROL MODULE EEPROM . |
| B2B31 | RR DOOR POWER WINDOW MANUAL UP SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B31 RR DOOR POWER WINDOW MANUAL UP SWITCH STUCK . |
| B2B32 | RR DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B32 RR DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK . |
| B2B33 | RR DOOR POWER WINDOW PULSE 1 AND 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B33 RR DOOR POWER WINDOW PULSE 1 AND 2 NO SIGNAL . |
| B2B34 | RR DOOR POWER WINDOW PULSE 1 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B34 RR DOOR POWER WINDOW PULSE 1 NO SIGNAL . |
| B2B35 | RR DOOR POWER WINDOW PULSE 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B35 RR DOOR POWER WINDOW PULSE 2 NO SIGNAL . |
| B2B36 | RR DOOR POWER WINDOW PULSE DIRECTION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B36 RR DOOR POWER WINDOW PULSE DIRECTION . |
| B2B37 | RR DOOR POWER WINDOW POSITION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B37 RR DOOR POWER WINDOW POSITION . |
| B2B38 | RR DOOR POWER WINDOW CONTINUOUS REVERSAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B38 RR DOOR POWER WINDOW CONTINUOUS REVERSAL . |
| B2B39 | RR DOOR POWER WINDOW CONTROL MODULE EEPROM | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B39 RR DOOR POWER WINDOW CONTROL MODULE EEPROM . |
| B2B41 | RL DOOR POWER WINDOW MANUAL UP SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B41 RL DOOR POWER WINDOW MANUAL UP SWITCH STUCK . |
| B2B42 | RL DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B42 RL DOOR POWER WINDOW MANUAL DOWN SWITCH STUCK . |
| B2B43 | RL DOOR POWER WINDOW PULSE 1 AND 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B43 RL DOOR POWER WINDOW PULSE 1 AND 2 NO SIGNAL . |
| B2B44 | RL DOOR POWER WINDOW PULSE 1 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B44 RL DOOR POWER WINDOW PULSE 1 NO SIGNAL . |
| B2B45 | RL DOOR POWER WINDOW PULSE 2 NO SIGNAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B45 RL DOOR POWER WINDOW PULSE 2 NO SIGNAL . |
| B2B46 | RL DOOR POWER WINDOW PULSE DIRECTION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B46 RL DOOR POWER WINDOW PULSE DIRECTION . |
| B2B47 | RL DOOR POWER WINDOW POSITION | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B47 RL DOOR POWER WINDOW POSITION . |
| B2B48 | RL DOOR POWER WINDOW CONTINUOUS REVERSAL | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B48 RL DOOR POWER WINDOW CONTINUOUS REVERSAL . |
| B2B49 | RL DOOR POWER WINDOW CONTROL MODULE EEPROM | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B49 RL DOOR POWER WINDOW CONTROL MODULE EEPROM . |
| B2B50 | POWER WINDOW MAIN SWITCH FAILURE | Ref. to POWER WINDOW (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2B50 POWER WINDOW MAIN SWITCH FAILURE . |
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.