What Does C1897 Mean?
The steering control module has detected a loop failure in the Variable Assist Power Steering II (VAPS II) circuit. The VAPS II system uses an electronically controlled solenoid to vary power steering assist based on vehicle speed, and this code indicates the control circuit feedback loop is not providing the expected response. Steering effort may become either too heavy or too light, particularly at varying speeds.
Common Causes
35%
Failed VAPS II solenoid actuator with internal coil degradation causing abnormal feedback signal
30%
Damaged wiring harness between the steering module and the VAPS solenoid, creating intermittent circuit continuity
25%
Corroded or contaminated connector at the VAPS solenoid or steering control module disrupting the feedback loop
10%
Faulty steering control module with internal feedback circuit failure
Diagnostic Steps
1
Step 1: Measure the VAPS II solenoid coil resistance at the solenoid connector (typical spec: 4-8 ohms). An out-of-range reading indicates solenoid failure.
2
Step 2: With key on, backprobe the VAPS II circuit and verify the module is commanding a variable duty cycle signal to the solenoid. Monitor with an oscilloscope for a clean PWM waveform.
3
Step 3: Check the return/feedback wire from the VAPS solenoid for continuity back to the steering module. This wire allows the module to verify solenoid current draw.
4
Step 4: Inspect the solenoid connector and module connector for corrosion, bent pins, and proper terminal tension. Check for power steering fluid contamination at the solenoid connector.
5
Step 5: If the solenoid and wiring test good, monitor the module's commanded vs. actual current values to determine if the module is the source of the fault.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The steering control module has detected a loop failure in the Variable Assist Power Steering II (VAPS II) circuit. The VAPS II system uses an electronically controlled solenoid to vary power steering assist based on vehicle speed, and this code indicates the control circuit feedback loop is not pro...
The most common cause of C1897 (Steering VAPS II Circuit Loop Failure) is: Failed VAPS II solenoid actuator with internal coil degradation causing abnormal feedback signal
Typical repair costs for C1897 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of variable steering assist can result in unexpectedly heavy steering at low speeds or dangerously light steering at highway speeds. Exercise caution while driving and avoid sudden maneuvers until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1897 to identify the root cause.
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Quick Info
Category
Chassis
System
Variable Assist Power Steering (VAPS)
Difficulty
Type
Manufacturer
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