B2170

Code

Other B — Body

Steering Column Lock Switch Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 26 EN: 68 RU: 34

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Page language: EN

Causes

Open or shorted wiring between the steering column lock switch and control module
Corroded, loose or damaged connector(s) at the steering column
Failed steering column lock switch or internal contact wear
Failed steering lock actuator or mechanical jam
Blown fuse or faulty relay supplying the switch/module
Poor ground or power supply to the steering lock circuitry

Symptoms

DTC B2170 stored in memory and possibly related immobilizer or security warnings
Steering column locked and key unable to turn or engine fails to crank
Intermittent or no response from steering lock mechanism
No-start condition or starter inhibited by security system
Warning lights or messages related to security/steering lock
Intermittent fault that may clear and return with movement of the steering column/harness

What to check

Read and record DTC(s) and freeze frame data with a scan tool; note ignition/key position when code set
Verify fuses and relays for steering lock and related modules
Visual inspection of steering column wiring harness and connectors for damage, chafing, corrosion or pin push-out
Wiggle test harness and connectors while monitoring live data or watching for DTC reappearance
Check for relevant module communication errors (CAN/BUS complaints) that could affect input
Listen for steering lock actuator operation when commanding/unlocking (if vehicle supports active tests)

Signal parameters

Reference supply to switch: typically battery voltage (~12 V) or a regulated reference (some systems use 5 V). Verify with service manual.
Switch closed continuity: near 0 Ω (a few ohms) between switch contacts; open should read OL or >1 MΩ.
Signal at control module: either near 0 V (ground) or near reference/battery depending on switch type; some systems report 0–5 V logic.
Expected no-load current for a locking actuator: varies by design—check service data; unusually high current suggests mechanical bind.
If intermittent, look for signal dropout or bouncing when harness is moved

Diagnostic algorithm

Connect a scan tool, read all stored and pending codes, note freeze frame (ignition state, battery voltage). Clear codes and attempt to reproduce the fault.
Verify relevant fuses and relays. Replace any blown fuses and re-test.
Visually inspect steering column harness, connectors, clock spring area and steering lock assembly for damage, corrosion or pinched wires. Repair obvious damage.
With ignition OFF and battery stable, unplug the steering column lock switch connector and inspect pins for corrosion and proper engagement. Reconnect firmly.
Measure reference voltage and signal at the switch connector with ignition in the required positions (OFF/ACC/ON/Start). Compare to expected values in the service manual. Note any missing reference or intermittent values.
Check continuity between the switch connector and the control module connector for the signal, reference and ground circuits. Repair any open or shorted conductors.
Perform wiggle/strain test on the harness and connector while monitoring live signal or DVOM to reproduce intermittent faults.
If wiring and connector are good, bench-test or substitute a known-good steering column lock switch/assembly if available. Replace the switch or actuator if it fails bench tests or shows out-of-spec behavior.
If the actuator does not operate when commanded from a scan tool, measure actuator power and ground while commanding. If power/ground present but no movement, replace actuator/assembly.
If wiring and lock components pass, investigate the receiving control module (BCM/immobilizer). Check for software updates and module communication errors; consider module reflash or replacement per manufacturer guidance.
After repairs, clear codes and verify repair by cycling ignition and road-testing. Monitor for recurrence and confirm proper steering lock behavior and starting function.
Safety note: When working around steering column and airbag components, follow manufacturer procedures to disable supplemental restraint systems and battery disconnect instructions.