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Home / DTC / C0770 — Steering Column Lock Control Circuit Malfunction

C0770 — Steering Column Lock Control Circuit Malfunction

Detailed page for trouble code C0770.

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C0770

Generic C — Chassis

Steering Column Lock Control Circuit Malfunction

Brand: Generic
Type: C — Chassis
Views: UK: 1 EN: 0 RU: 0
AI status
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Page language: EN

Causes

  • Blown fuse or faulty relay supplying the steering column lock circuit
  • Damaged, corroded, or disconnected wiring or connector(s) at the steering column lock actuator
  • Faulty steering column lock actuator or lock motor
  • Intermittent open or short to battery/ground on control or supply circuits
  • Faulty body or chassis control module (BCM) or steering column module
  • CAN bus or data communication error between modules

Symptoms

  • Steering wheel remains locked or intermittently locks/unlocks
  • Vehicle may not start if immobilizer/lock prevents key cycle
  • Steering lock warning, security, or check messages on dash
  • No audible click or movement when attempting to unlock the steering column
  • Stored or pending DTCs related to body/steering modules or CAN communication

What to check

  • Retrieve freeze frame and full list of codes with a scan tool; note any related U codes or body module errors
  • Inspect fuses and relays for the steering column lock circuit
  • Visually inspect wiring harness and connectors at the steering column for corrosion, damage, or disconnected pins
  • Check battery voltage and supply while commanding lock/unlock (voltage should be ~12V to 14.5V)
  • Backprobe connector at the lock actuator while commanding lock/unlock to confirm control, supply and ground signals
  • Check for CAN bus errors or lost communication messages between BCM and steering column module

Signal parameters

  • Supply voltage to actuator: battery voltage (nominal 11.5–14.5 V) when powered
  • Ground continuity: near 0 ohms to chassis ground
  • Control signal voltage: varies by design (0–12 V switch or PWM) — observe change when commanding lock/unlock
  • Actuator resistance: compare with factory spec (typical few ohms to hundreds of ohms for motor/coils)
  • CAN bus idle voltage: approx. 2.5 V differential bias on CAN_H/CAN_L (check module comms)

Diagnostic algorithm

  1. Obtain stored codes and vehicle-specific freeze frame data with a scan tool; note related communication codes (U-codes)
  2. Verify battery voltage is stable and above 12V during tests; recharge or charge if low
  3. Inspect fuses and relays in instrument and body fuse boxes; replace any blown fuses and retest
  4. Visually inspect connectors and wiring at the steering column lock for corrosion, bent pins, or damage; repair as needed
  5. Backprobe the actuator connector while commanding lock/unlock from scan tool: verify supply (battery), ground, and control signal change. If no supply, trace back to fuse/relay/BVSM/BCM
  6. If control signals are present but actuator does not move, disconnect and bench-test actuator (apply correct supply and ground) to confirm mechanical/electrical failure
  7. If actuator is confirmed good but module commands do not reach the actuator, check harness continuity and resistance between module pin and actuator pin; repair any opens or shorts
  8. Check for communication errors on the CAN bus and verify module presence/response in the scan tool; if a module is unresponsive, troubleshoot CAN wiring and termination
  9. After repairs, clear codes and perform functional test of steering lock operation; road test or cycle ignition several times to confirm issue resolution

Likely causes

  • Corroded connector at the steering column (common location)
  • Shorted control wire to battery or chassis ground from recent repairs or routing near sharp edges
  • Failed steering lock actuator motor due to age or water ingress
  • Blown fuse in instrument or body fuse box protecting the lock circuit

Fault status

⚠️ Status
Steering Column Lock Control Circuit Malfunction — an electrical or communication fault was detected in the steering column lock control circuit. The lock may not operate correctly until the cause is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

C0771 C0775 C1234 U0100 U0140
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