What Does B2170 Mean?
DTC B2170 indicates the Body Control Module (BCM) has detected an electrical fault in the steering column lock switch circuit. This system is part of the vehicle's anti-theft mechanism that locks the steering column when the ignition is off and the key is removed. The BCM has identified an open circuit, short circuit, excessive resistance, or mechanical failure preventing proper operation of the steering column lock actuator or its control circuit.
Common Causes
45%
Faulty steering column lock actuator motor or solenoid with internal open circuit or mechanical binding
30%
Damaged wiring harness or corroded connectors between BCM and steering column lock actuator
15%
Failed steering column lock switch or position sensor providing incorrect feedback signal
10%
Body Control Module internal circuit failure or corrupted software
Diagnostic Steps
1
Step 1: Perform thorough visual inspection of steering column lock actuator connector and wiring harness for damaged insulation, corroded pins, bent terminals, water intrusion, or loose connections. Wiggle test connectors while monitoring live data
2
Step 2: Using a digital multimeter, check for battery voltage supply at the steering column lock actuator connector with ignition in accessory or run position. Verify ground circuit has less than 0.2 ohms resistance to chassis ground
3
Step 3: Disconnect steering column lock actuator connector and measure resistance of actuator motor windings (typically 3-8 ohms). Check for shorts to ground or open circuits. Test mechanical operation by carefully applying 12V directly to actuator terminals and listen/feel for actuation
4
Step 4: With actuator disconnected, backprobe BCM connector and measure control circuit voltage during lock/unlock command using bidirectional controls in scan tool. Should cycle between 0V and battery voltage. If no voltage change, suspect BCM or open circuit to actuator
5
Step 5: Clear codes, cycle ignition through all positions multiple times, and attempt to duplicate fault. Monitor live data for lock position sensor feedback and actuator command status. Verify proper synchronization between key position and lock engagement
6
Step 6: If all circuits test normal, perform BCM software update if available. If fault persists with verified good circuits and actuator, replace BCM and reprogram/configure to vehicle
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
DTC B2170 indicates the Body Control Module (BCM) has detected an electrical fault in the steering column lock switch circuit. This system is part of the vehicle's anti-theft mechanism that locks the steering column when the ignition is off and the key is removed. The BCM has identified an open circ...
The most common cause of B2170 (Steering Column Lock Switch Circuit Failure) is: Faulty steering column lock actuator motor or solenoid with internal open circuit or mechanical binding
Typical repair costs for B2170 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive if steering column unlocks properly when starting. However, anti-theft protection may be compromised, and in some cases the steering may remain locked preventing vehicle operation. Address promptly to restore security system functionality and prevent potential no-start conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2170 to identify the root cause.
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Quick Info
Category
Body
System
Anti-Theft System / Steering Column Lock
Difficulty
Type
Generic (SAE)
Recommended Tools
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