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Home / DTC / B1A92 — Speed Position Sensor B

B1A92 — Speed Position Sensor B

Detailed page for trouble code B1A92.

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Code

B1A92

LAND ROVER B — Body

Speed Position Sensor B

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, shorted or damaged sensor wiring or connector (corrosion, broken wire, poor pin contact)
  • Failed Speed Position Sensor B (electrical or internal fault)
  • Damaged or dirty tone ring/reluctor (missing teeth, excessive debris)
  • Poor sensor alignment or air gap out of specification
  • Blown fuse or missing reference power/ground for the sensor circuit
  • Intermittent module power/ground or communication fault to BCM/ABS module

Symptoms

  • Speedometer inoperative, erratic, or reading incorrectly
  • ABS, traction control or stability warning lamps may illuminate
  • Cruise control may be disabled or inoperative
  • Transmission shifting irregular or stuck in limp/second gear
  • Stored related diagnostic trouble codes and reduced functionality of systems using vehicle speed

What to check

  • Read freeze frame and full scan tool data from BCM and related modules
  • Inspect sensor B connector and wiring for corrosion, damage or loose pins
  • Check for presence of sensor reference power and ground at the connector
  • Observe live speed sensor B signal using a scan tool or oscilloscope while rotating wheel/drive shaft
  • Compare Sensor A and Sensor B signals (if applicable) for symmetry and consistency
  • Inspect tone ring/reluctor for missing teeth, dirt, or physical damage

Signal parameters

  • Active (Hall/logic) speed sensors typically produce a square or pulse signal approximate 0–5 V or 0.5–4.5 V referenced to sensor ground
  • Passive (VR) sensors produce an AC sine-like voltage whose amplitude increases with rotational speed (tens of mV to several volts)
  • Signal frequency increases linearly with wheel/shaft speed; verify pulses per revolution expected for the vehicle
  • Expected continuity: sensor coil resistance (passive) within manufacturer spec (typical tens to hundreds of ohms); active sensors often show a stable three-wire connector with 5 V reference, ground and signal

Diagnostic algorithm

  1. Connect a capable scan tool, record B1A92 and any related codes and live data streams for speed sensors and vehicle speed.
  2. Visually inspect sensor B connector, wiring loom and sensor mounting. Repair any obvious physical damage or corrosion.
  3. With connector plugged, backprobe the connector to verify sensor supply voltage (if active) and ground present with ignition ON. If missing, trace power/ground path and fuses.
  4. With vehicle safely raised or with wheel rotated by hand, monitor live sensor B output on the scan tool. If tool cannot display raw pulses, use a multimeter or oscilloscope to verify signal while rotating the wheel/shaft.
  5. If no or intermittent signal is present, unplug sensor and measure sensor resistance (passive) or check signal wiring continuity to the control module. Replace sensor if out of specification.
  6. Inspect tone ring/reluctor for missing teeth, heavy corrosion or debris. Repair or replace as needed and correct sensor gap/alignment per manufacturer spec.
  7. Repair any wiring faults (chafed wires, shorts to ground or battery, corroded pins). Ensure proper sealing and secure routing away from heat/moving parts.
  8. After repairs, clear codes and road test to confirm proper operation and that code does not return. If fault persists, capture oscilloscope traces and consult module-specific diagnostics or dealer-level service literature for advanced checks or reprogramming.

Likely causes

  • Wiring/connector corrosion or broken wire between sensor and BCM
  • Failed Hall-effect or VR speed sensor
  • Damaged/missing teeth on tone ring at wheel or transmission
  • Poor sensor mounting or incorrect gap causing weak/no signal
  • Intermittent connector contact (moisture/oxidation)

Fault status

⚠️ Status
Speed Position Sensor B - signal missing, implausible or out of range; module set B1A92 and stored fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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