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Home / DTC / B12A8 — Direction column telescope sensor A

B12A8 — Direction column telescope sensor A

Detailed page for trouble code B12A8.

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Code

B12A8

LAND ROVER B — Body

Direction column telescope sensor A

Brand: LAND ROVER
Type: B — Body
Views: UK: 4 EN: 9 RU: 4
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Page language: EN

Causes

  • Failed telescopic position sensor (internal fault)
  • Damaged or corroded connector or wiring (open, short to ground or power, intermittent)
  • Faulty column telescoping motor/actuator causing sensor misreading
  • Poor sensor mounting or mechanical binding of the column
  • Loss of reference power or ground to the sensor
  • Module software/calibration error or control module fault

Symptoms

  • Telescopic adjustment does not operate or is intermittent
  • Steering column memory positions fail to set or recall
  • Warning lamp or message related to steering/driver position on instrument panel
  • Erratic or no position reading in live data when operating column
  • Unusual noise from column when attempting to telescope (grinding or binding)

What to check

  • Read DTCs and freeze frame data with a diagnostic scan tool; record any related codes
  • Attempt to operate the telescope function while watching live sensor data
  • Inspect sensor connector and wiring for damage, corrosion, or poor seating
  • Back-probe sensor connector and check supply voltage and ground with key on
  • Check continuity and resistance of the sensor wiring harness (wiggle test while monitoring)
  • Visually inspect column for mechanical binding or foreign objects

Signal parameters

  • Sensor type may be analog (potentiometer/Hall) or LIN/CAN message depending on model
  • Analog-type: typical position output ~0–5 V proportional to travel (verify exact values from OEM data)
  • Supply reference commonly +5 V (verify) and ground; check for stable reference
  • If LIN/CAN: expect regular position messages and no communication errors on the bus
  • Resistance between sensor terminals (if potentiometer) should change smoothly across travel — no open circuits

Diagnostic algorithm

  1. Retrieve and record all stored and pending DTCs; clear codes and perform one re-test to confirm repeatability.
  2. With a scan tool, view live data for telescope position A while commanding the column to extend/retract; note if reading is stable and follows movement.
  3. Inspect the sensor connector and wiring harness for damage, corrosion, or pin push-out; repair or reseal as required.
  4. Back-probe the sensor connector: verify supply voltage (reference), signal output and ground integrity with key on and while operating the column.
  5. Perform a wiggle test on the harness and connectors while observing live data or using a DVOM to find intermittent opens/shorts.
  6. If analog signal is out of expected range or absent, measure sensor resistance across terminals (if applicable) while moving column to confirm smooth change; replace sensor if erratic or open.
  7. If power/ground are missing, trace and repair wiring, check fuses/relays and related modules for faults.
  8. If wiring and supply are good but signal is invalid, replace the telescope position sensor or associated assembly per OEM procedure.
  9. After any repair or replacement, perform any required sensor calibration/initialization and clear codes; verify operation and re-scan for DTC return.
  10. If fault persists, consider control module fault or CAN/LIN bus issues and proceed with module bench or network diagnostics per manufacturer guidance.

Likely causes

  • Connector pin corrosion or loose terminal at the sensor
  • Broken/damaged harness where it flexes inside the column
  • Sensor has failed internally (common with wear or contamination)
  • Column actuator seized or dragging and driving sensor out of range
  • Blown fuse or interrupted supply/ground to the column assembly

Fault status

⚠️ Status
Direction column telescope sensor A — circuit/signal fault (invalid, out-of-range, intermittent, or no signal).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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