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Home / DTC / B2A27 — Steering Column Lock Actuator Circuit Malfunction

B2A27 — Steering Column Lock Actuator Circuit Malfunction

Detailed page for trouble code B2A27.

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B2A27

Generic B — Body

Steering Column Lock Actuator Circuit Malfunction

Brand: Generic
Type: B — Body
Views: UK: 0 EN: 1 RU: 0
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Page language: EN

Causes

  • Blown fuse or faulty relay for steering lock circuit
  • Damaged wiring harness or connector (open, short to power/ground, corrosion) to the actuator
  • Faulty steering column lock actuator (motor/solenoid)
  • Poor or corroded ground at actuator or control module
  • Faulty Body Control Module (BCM) or steering lock control module driver
  • Intermittent mechanical binding of the lock preventing normal electrical operation

Symptoms

  • Steering column lock won’t engage or release
  • Key stuck in ignition or cannot be removed
  • Vehicle may not crank or immobilizer warning displayed
  • Steering lock warning or message on dash
  • Audible clicking from column when attempting lock/unlock
  • Intermittent lock operation

What to check

  • Retrieve DTCs and freeze frame data with a scan tool; note any related communication codes (U-codes)
  • Perform a visual inspection of the steering column wiring, connector, and fuse/relay box for damage or corrosion
  • Verify fuse(s) and relay(s) for steering lock circuit are present and functional
  • Attempt lock/unlock while monitoring scan tool for commands and module responses
  • Backprobe actuator connector to verify supply voltage and ground while operating lock/unlock command
  • Measure actuator coil resistance and compare to expected range

Signal parameters

  • Supply voltage at actuator with key ON or during command: ~11–14 V (battery voltage)
  • Ground continuity to chassis ground: ~0 Ω (low resistance)
  • Typical actuator coil resistance (vehicle-dependent): commonly ~5–50 Ω (measure and compare to spec)
  • Actuator current draw during operation: can be 0.5–5 A peak (higher indicates mechanical bind or short)
  • Control signal: switched battery or low-side driver/PWM; control module should issue a command when lock/unlock requested
  • No voltage/current present when system is inactive (except small wake currents)

Diagnostic algorithm

  1. Verify the customer complaint and read stored codes and freeze frame. Note any related U-codes (CAN/LIN communication faults).
  2. Visual inspection: check connectors, pins, wiring harness, and steering column for damage, chafing, or corrosion. Inspect fuses and relay. Repair obvious damage.
  3. With connector accessible, backprobe the supply and ground. Verify battery voltage at the actuator harness with key ON and while commanding lock/unlock. If supply is missing, trace/backprobe toward fuse and relay.
  4. Check ground integrity: measure voltage drop between actuator ground and chassis during operation; repair poor ground if present.
  5. Measure actuator coil resistance (with connector disconnected). Compare to service specification. Infinite/open or very low/short indicates a failed actuator.
  6. Command lock/unlock from a scanner while monitoring voltage and current. Observe for clicking, motion, or abnormal current. High current or no movement suggests mechanical binding or shorted actuator windings.
  7. If actuator electrical tests pass but unit does not operate, inspect mechanically for binding or obstruction and verify pinion/ratchet movement. Lubricate or repair mechanical components as required.
  8. If wiring and actuator are good but control module does not command or shows intermittent outputs, check module grounds, power, and network communications (CAN/LIN). Repair wiring or restore communication.
  9. If BCM or steering lock control module is suspected faulty after wiring and actuator ruled out, verify with a known-good module or manufacturer-specific diagnostic procedures; reprogram or replace as required.
  10. After repairs, clear codes, operate the lock through multiple cycles, and confirm no recurrence of DTC and normal steering/immobilizer operation.

Likely causes

  • Connector corrosion or loose pin at actuator
  • Open/short in supply or ground conductor to actuator
  • Failed actuator motor or solenoid
  • Blown fuse protecting the lock actuator circuit

Fault status

⚠️ Status
Stored when the control module detects an open, short, intermittent, or out-of-parameter condition in the steering column lock actuator circuit or when commanded operation is not achieved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B2A26 B2A28 B2799 U0140 U0121 P1621
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