Steering Column Lock Switch Circuit Failure
The B2170 code indicates a failure in the steering column lock switch circuit. This Ford-specific code is triggered when the control module detects an incorrect, missing, or out-of-range signal from the switch that monitors the lock mechanism's status. As part of the Passive Anti-Theft System (PATS), this circuit controls whether the vehicle can start. A fault here can disable the starting system or cause erratic lock behavior.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn steering column lock switch
- Open, shorted, or high-resistance wiring in the switch circuit
- Corroded or loose connector at the switch harness
- Faulty steering column lock control module
- Mechanical binding or failure in the lock mechanism
3. Symptoms You Will Notice
- Engine cranks but does not start
- Steering column lock fails to engage or disengage
- Anti-theft warning light illuminated on the dash
4. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data
Visually inspect the steering column lock switch connector and wiring for damage or corrosion
Test the switch for proper continuity and resistance per manufacturer specs
Check for voltage and ground at the switch circuit using a multimeter
If wiring and switch are good, test the control module or perform a PATS relearn procedure
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The steering column may lock unexpectedly while driving, or the vehicle may not start, leaving you stranded. Have the issue diagnosed and repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $150 to $500, depending on whether the switch, wiring, or control module needs replacement. Labor is usually 1-2 hours.