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Home / DTC / B1A93 — Speed Position Sensor

B1A93 — Speed Position Sensor

Detailed page for trouble code B1A93.

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B1A93

LAND ROVER B — Body

Speed Position Sensor

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

Causes

  • Faulty speed/position sensor (wheel, transmission output, or vehicle speed sensor)
  • Damaged or corroded connector or wiring harness (open, short to ground or short to power)
  • Damaged or contaminated tone ring/reluctor (missing teeth, rust, debris)
  • Poor reference power or ground to the sensor
  • Intermittent connection due to chafing or broken wire
  • Faulty ABS/BCM/ECU module or internal module input circuit

Symptoms

  • ABS, traction control or stability warning lamp illuminated
  • Speedometer erratic, intermittent or not working
  • Cruise control disabled or unavailable
  • Incorrect gear shifting or transmission limp behavior on some models
  • Vehicle stability or traction interventions operating incorrectly
  • Stored related or communication fault codes in ABS/BCM/ECM

What to check

  • Read all stored codes and freeze frame data from ABS, BCM and engine modules
  • Visually inspect sensor, tone ring/reluctor and connector for damage, contamination or corrosion
  • Wiggle test wiring and connector while monitoring live sensor data for intermittent changes
  • Measure sensor resistance/continuity against service specifications
  • Backprobe connector to verify reference supply voltage and ground
  • Probe sensor output with oscilloscope or scan tool while rotating wheel/shaft to view waveform

Signal parameters

  • Active (Hall/active) sensors: reference voltage typically ≈4.5–5.5 V; output switches between ~0.5 V (low) and ~4.5 V (high) as teeth pass (square wave). Frequency rises with speed.
  • Passive (magnetic) sensors: generate AC sine/triangular voltage; amplitude increases with rotational speed (mV to volts depending on speed).
  • Typical static resistance (passive type) often in the hundreds to a few thousand ohms — consult vehicle service data for exact value.
  • Signal frequency roughly proportional to wheel/shaft RPM — compare pulses per revolution to specification.
  • Expected fault signs: open circuit (OL) on resistance check, no reference voltage, stuck/high noise on output, missing pulses or irregular pulse spacing.

Diagnostic algorithm

  1. Retrieve code(s) and diagnostic data from ABS, BCM and engine control modules; note freeze frame and related codes.
  2. Perform visual inspection of the indicated sensor and harness (look for physical damage, corrosion, bent pins, loose clips).
  3. Check connector: disconnect, inspect pins for corrosion, clean and re-seat; measure continuity from module pin to sensor pin.
  4. Measure sensor resistance (if passive) or check reference power and ground (if active). Compare to spec sheet.
  5. Backprobe sensor output and operate wheel/shaft (rotate by hand or drive slowly) while observing output with a scan tool or oscilloscope. Look for clean pulses, correct amplitude and consistent frequency.
  6. If signal is absent or intermittent, perform wiggle test on harness while monitoring signal to reproduce fault; repair wiring or connector as required.
  7. Inspect tone ring/reluctor for missing teeth, heavy rust or debris and correct sensor air gap to specification.
  8. If electrical checks pass but signal is incorrect, replace the sensor and retest.
  9. If replacement sensor still fails and wiring checks good, suspect module input fault—verify module grounds/power and consult service manual for module diagnostics.
  10. Clear codes and road test to confirm repair; re-scan for any reoccurring faults.

Likely causes

  • Water ingress/corrosion at sensor connector (common cause on older vehicles)
  • Sensor air gap too large or magnetic debris on tone ring
  • Wiring rubbed through at suspension/steering pivot causing intermittent open/short
  • Sensor itself failed electrically (open coil or internal electronics)
  • Module input or vehicle ground fault (less common)

Fault status

⚠️ Status
Speed Position Sensor — signal fault or no/erratic pulse to module
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0500 P0502 C0035 C0040 C0045 C0050
320

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