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Home / DTC / B12A2 — The steering column adjusts the switch

B12A2 — The steering column adjusts the switch

Detailed page for trouble code B12A2.

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Code

B12A2

LAND ROVER B — Body

The steering column adjusts the switch

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 13 RU: 10
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Page language: EN

Causes

  • Faulty steering column adjustment switch (mechanical/electrical failure)
  • Open, short to ground, or short to voltage in switch wiring or connector
  • Corroded or loose connector pins at the switch or steering column module
  • Blown fuse or loss of supply/ground to the switch/module
  • Faulty steering column control module or related ECU
  • Software anomaly or calibration error requiring reflash/relearn

Symptoms

  • Steering column tilt/telescope adjustment inoperative or intermittent
  • Instrument cluster message or warning lamp related to steering column
  • Clicking or no response when operating the column adjustment switch
  • Vehicle stores related fault codes; possible limited functionality of adjustment
  • Occasional operation restored by moving wiring or connector (intermittent)

What to check

  • Retrieve all related codes with a diagnostic scanner and record freeze frame/live data
  • Visual inspection of steering column area for damage, water ingress or corrosion
  • Check fuses and measure battery supply at the steering column module and switch
  • Wiggle test connectors while operating switch to reproduce fault
  • Check for SCAN tool active test of column adjuster and switch feedback (if available)
  • Inspect wiring harness for chafing where it passes through the dash/steering column

Signal parameters

  • 12 V supply present at switch power pin with ignition ON (typical)
  • Ground continuity between switch ground and chassis (near 0 Ω)
  • Switch output changes state when actuated (open/closed or 0–5 V depending on design)
  • Steering column module reports switch state via CAN/diagnostic data when operated
  • Quiescent current for switch circuit usually very low; no high current draw expected

Diagnostic algorithm

  1. Read and record the full code list and any related historical codes. Note conditions when code set.
  2. Attempt to reproduce complaint and re-check for the code while operating the column adjust switch.
  3. Visually inspect switch, connectors and harness for damage, corrosion, water ingress or pin deformation.
  4. Check related fuses and power/ground at the steering column module and at the switch connector with a DVOM.
  5. Backprobe the switch connector and measure supply, ground and switch output while operating the switch. Verify the signal changes as expected.
  6. If no proper signal, perform continuity check from switch connector to steering column module connector to locate open/short.
  7. Perform wiggle testing on harness and connector while monitoring live data to locate intermittent faults.
  8. If wiring and switch test good, check for CAN/communication errors (e.g., U0121/U0155) and test steering column control module operation via factory scan tool.
  9. If module software is outdated or shows internal errors, consider reprogramming or module replacement per manufacturer procedure.
  10. Replace faulty switch or repair wiring/connector as required. Clear codes and verify repair by cycling ignition and operating the adjuster several times, re-checking for reappearance of the code.

Likely causes

  • Broken or corroded connector at the steering column switch
  • Faulty adjustment switch (worn contacts)
  • Open or shorted wiring between the switch and steering column module

Fault status

⚠️ Status
Steering column adjustment switch circuit malfunction — the steering column module has detected an invalid or missing signal from the column adjust switch and set DTC B12A2.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B12A0 B12A1 B12A3 U0121 U0155
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