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Home / DTC / B1237 — Window door glass feedback, outside the strip

B1237 — Window door glass feedback, outside the strip

Detailed page for trouble code B1237.

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Code

B1237

LAND ROVER B — Body

Window door glass feedback, outside the strip

Brand: LAND ROVER
Type: B — Body
Views: UK: 5 EN: 7 RU: 2
AI status
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Page language: EN

Causes

  • Damaged/shorted wiring or poor connector at window motor/position sensor
  • Contaminated/corroded connector or water ingress in door
  • Faulty window regulator or motor with integrated position sensor
  • Misaligned or binding window glass or tracks
  • Failed position sensor (potentiometer/Hall sensor) in motor assembly
  • Faulty door control module (DCM) or body control module (BCM) software/calibration

Symptoms

  • Window auto up/down or one-touch functions inoperative or inconsistent
  • Window stops or reverses unexpectedly during travel
  • Message or warning on dash related to window or door system
  • DTC stored and may reappear after clearing
  • Window position failures or inability to perform window calibration/relearn

What to check

  • Use a diagnostic scan tool to read B1237 and any associated codes; view live data for window position feedback while operating the switch
  • Visually inspect door wiring harness, especially at door hinge/boot, for chafing, breaks, or water ingress
  • Inspect and unplug the window motor/position sensor connector — check pins for corrosion, bent pins or moisture
  • Operate the window while watching/feeling for binding, poor alignment, or unusual noises in regulator/tracks
  • Check for service bulletins or software updates related to window modules for this model/year
  • Verify battery voltage is within nominal range during tests (low voltage may cause spurious errors)

Signal parameters

  • Position feedback signal typically a variable voltage/count (approx. 0–5 V or serial position value) which should change smoothly as the window moves
  • Expected behavior: steady change in voltage/count from one end-stop to the other with no sudden jumps or open-circuit reading
  • Fault condition: fixed value, erratic jumps, out-of-range voltage, or no change when the window is commanded

Diagnostic algorithm

  1. Connect a capable scan tool and note B1237 and any related codes; monitor live data for window position while commanding the window up/down
  2. Attempt to reproduce the fault: cycle the window several times and observe the feedback trace for jumps, dropouts, or fixed values
  3. Visually inspect connectors at the door control module and window motor; disconnect and inspect pins for corrosion or damage
  4. With ignition on and window commanded, backprobe the position sensor/feedback connector and measure voltage (or serial position counts) — verify movement produces smooth, continuous change within expected range
  5. Perform a wiggle test of the door harness (at hinge area) while monitoring feedback for intermittent faults
  6. Inspect window tracks and regulator operation; free and lubricate tracks if binding is found, then retest
  7. If wiring and mechanicals check good but sensor signal incorrect, replace the window motor/regulator assembly (most include the feedback sensor) and retest
  8. If new assembly still reports fault, check communications to door/BCM; if wiring and communications are OK, consider door control module replacement or software reflash as directed by latest dealer procedures
  9. After repairs, clear codes and perform any required window calibration/relearn procedure; road-test and recheck for return of the code

Likely causes

  • Corroded/loose connector at the motor/position sensor
  • Binding regulator or off-track glass causing unexpected sensor readings
  • Failed position sensor in the window motor assembly
  • Wiring damage inside the door harness (pinched at hinge)

Fault status

⚠️ Status
Window door glass feedback — position sensor reading outside expected range. Triggered when feedback signal is out-of-bounds or inconsistent during window movement or calibration.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1236 B1238 U0140 U0121
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