B2247 – Right front window motor circuit open (BYD)

B2247 means the right front power window may stop working or work only sometimes. You will usually notice the window will not move, or it moves in one direction only. According to BYD factory diagnostic data, this code indicates an open circuit in the right front window motor circuit. That matters because an “open” points to lost electrical continuity, not a guaranteed bad motor. On the BYD Atto 3 platform, this fault often comes down to wiring at the door jamb, a loose connector at the motor, or a poor ground that fails under load.

B2247 Quick Answer

B2247 on BYD vehicles flags an open circuit in the right front window motor circuit. Diagnose the power, ground, and motor drive wires at the door before replacing the motor or switch.

What Does B2247 Mean?

Official definition: “Right front window motor circuit open.” In plain terms, the body system sees a break in the electrical path that should power and control the right front window motor. In practice, the window may not move, may stop mid-travel, or may only respond intermittently.

What the module checks: the window control module (often integrated into a door module or body controller, depending on BYD configuration) monitors the motor drive circuit’s continuity and expected electrical behavior during commands. It looks for a circuit response when it commands UP or DOWN. Why it matters: an open can come from the harness, connectors, or internal motor connections. The DTC points to the suspected trouble area. It does not prove the motor failed.

Theory of Operation

Under normal operation, the BYD window system sends a command from the switch to the control module. The module then drives the window motor using a reversible polarity circuit. It also watches electrical feedback to confirm the motor circuit responds to the command.

B2247 sets when the module commands the right front window motor and does not see the expected circuit reaction. An open in the power feed, ground path, or either motor drive lead can cause this. A connector that holds at rest can still open under vibration or when the window loads up.

Symptoms

You will usually notice a right front window problem first, then the code shows up during a scan.

• Window inoperative right front window does not move up or down
• Intermittent operation window works sometimes, then quits without warning
• One-direction only window moves up but not down, or down but not up
• Stops mid-travel window starts moving, then stops as load increases
• No motor sound you hear no motor noise when pressing the switch
• Auto function loss one-touch up/down or pinch protection features stop working
• Other door functions mirror or lock issues may appear if the door harness has damage

Common Causes

• Broken wire in the right front door harness: Repeated door opening flexes the loom and can open the motor feed or motor return wire.
• Pushed-out or loose motor connector terminal: A terminal that backs out loses contact under vibration and the module reads an open circuit.
• Corrosion in the door-side connector: Moisture intrusion increases resistance until the circuit effectively opens during motor load.
• Open in the power supply path (fuse, splice, or junction): A failed supply point removes power to the window motor circuit and triggers the open-circuit logic.
• Failed window switch contact or internal switch circuit open: The switch can interrupt the command path so the module never sees expected current flow.
• Window motor internal open (brushes, commutator, thermal protector): An internal break prevents current flow even when the module commands movement.
• High-resistance ground path that acts open under load: A weak ground can pass a continuity check but drop out when the motor draws current.
• Body controller/door module output stage fault: A damaged driver can stop supplying power or ground to the motor, which the module interprets as an open circuit.

Diagnosis Steps

Use a scan tool that can access BYD body/door modules and show live data. You also need a DVOM, a test light or fused jumper, and basic back-probing tools. Plan to do voltage-drop tests with the window operating. Continuity checks alone miss load-sensitive opens. Have wiring diagrams available for the right front window motor circuit.

1. Confirm B2247 in the scan tool and note whether it shows as pending, stored, or current. Record freeze frame data if the module provides it. Focus on battery voltage, ignition state, and any window switch status at the moment the code set. Freeze frame shows when the fault set, not why it set.
2. Before any meter work, do a fast visual check of the entire circuit path. Inspect the right front door jamb harness boot, the motor connector, and the switch area. Look for stretched wires, pinch points, and signs of water entry. Then check related fuses and power distribution feeds for the window system.
3. Verify power and ground quality for the controlling module and window circuit under load. Command the right front window while you voltage-drop test the module grounds. Keep the circuit operating during the test. Accept less than 0.1 V drop on grounds with the circuit active.
4. Run a network scan and check for companion body codes. Pay attention to any door module, switch, or power supply DTCs that share the same feed. Fix shared power or ground faults first. They can create multiple false “open circuit” codes.
5. Use live data to watch right front window switch inputs and motor command outputs, if available. Toggle UP and DOWN and confirm the module registers the request. If the request never changes, focus on the switch circuit and its connector pins. If the request changes but the motor command never follows, focus on the module output path and interlocks.
6. At the right front window motor connector, test for commanded voltage during an UP or DOWN request. Back-probe the connector with it connected when possible. If you see no commanded voltage in either direction, move upstream to the module output connector and test there. This isolates harness versus module output.
7. If you see commanded voltage at the module but not at the motor, load-test the suspect wire run. Use a test light or a fused jumper load to verify the wire can carry current. A wire can show voltage with no load and still act open. Pay special attention to the door jamb flex section.
8. If you see proper commanded voltage at the motor but the motor does not run, verify the ground side with a voltage-drop test while commanding movement. Then reverse the command direction and repeat. Many BYD window systems swap polarity to reverse direction. An open on either leg can set B2247.
9. Check connector terminal fit and retention at the motor, switch, and module. Do a light tug test on each wire at the back of the connector. Look for spread terminals, overheated pins, or backed-out terminals. Repair terminal issues before replacing any component.
10. If the wiring and terminals pass, bench-test the motor with a fused power source and a known-good ground. Keep the regulator unloaded if possible to reduce pinch risk. If the motor fails to run or draws abnormal current, replace the motor or the motor/regulator assembly as applicable. Verify the circuit again after installation.
11. Clear codes and re-run the window through several full up/down cycles. Recheck for immediate code return on key-on. If the code was intermittent, use a scan tool snapshot feature during a road test or door-slam simulation. A snapshot captures live data at the moment the concern happens, which differs from freeze frame.

Professional tip: Treat “circuit open” as a current-flow problem, not a simple continuity problem. Load the circuit during testing. A corroded splice or weak terminal can pass an ohmmeter check and still fail when the motor draws current. Flex the door harness while watching live data and commanded voltage. Intermittent opens often show up only during movement.

Possible Fixes

• Repair the right front door jamb harness: Restore broken conductors and add proper strain relief in the flex area.
• Service connector terminals: Reseat backed-out pins, repair terminal tension, and remove corrosion at the motor, switch, or module connectors.
• Restore power distribution: Repair the open at the fuse, splice, or junction that feeds the right front window circuit.
• Repair the ground path: Clean and tighten ground points and repair high-resistance ground wiring verified by voltage-drop testing.
• Replace the right front window motor/regulator assembly only after testing: Replace the unit if it fails a fused bench test or shows an internal open under load.
• Replace or repair the controlling module only after output verification: Consider a door/body module only if outputs fail with proven good power, grounds, and wiring.

Can I Still Drive With B2247?

You can usually drive a BYD Atto 3 with B2247 because it targets the right front power window motor circuit, not propulsion or braking. Treat it as a body electrical fault. The main risk involves window control. A window stuck open can allow theft, water intrusion, and wind noise. A window that moves unpredictably can pinch fingers. Keep hands clear during testing. Avoid repeated switch cycling because it can overheat wiring or a stalled motor. If the window drops while driving, stop and secure the opening before continuing.

How Serious Is This Code?

B2247 ranges from inconvenience to a real safety concern. It stays minor when the right front window simply does not move and remains fully closed. It becomes more serious when the window stays open, moves intermittently, or the switch feels hot. An open-circuit fault can also cause other symptoms if the door harness shares a ground or connector with door locks or mirror functions. Drivability usually stays normal, but occupant safety and security can suffer. Prioritize diagnosis before long trips, heavy rain, freezing weather, or when children frequently use the window.

Common Misdiagnoses

Technicians often replace the right front window motor first because the scan description mentions “motor circuit.” That wastes money when the real fault sits in the door-jamb harness, a loose connector at the motor, or high resistance at a ground splice. Another common miss involves the master switch assembly. Shops condemn the switch without checking for power and ground under load at the motor connector. DIY owners also clear the code after a battery reset and assume the problem fixed itself. B2247 returns when vibration opens the circuit again. Avoid these errors by proving the open with continuity checks, voltage-drop tests while commanding the window, and a connector pin-fit inspection.

Most Likely Fix

The most frequent confirmed repair direction for B2247 on BYD platforms involves restoring circuit continuity between the door control circuitry and the right front window motor. Start by repairing damaged wiring in the door-to-body harness boot and correcting loose, backed-out, or corroded terminals at the motor or door switch connectors. If the circuit tests good end-to-end, then load-test the motor feed and ground while commanding up and down. Replace the motor or switch only after measurements prove the component fails to pass current. After repair, cycle the window repeatedly and road-test to confirm the code does not reset. Enable criteria vary by system, so follow service information for the exact confirmation routine.

Repair Costs

Repair cost depends on whether the confirmed root cause is a sensor, wiring, connector issue, or control module problem. Verify the fault electrically before replacing parts.

Last updated: March 30, 2026