What Does C1898 Mean?
The steering module has detected an open circuit in the VAPS II control loop. There is a complete break in the electrical path of the solenoid feedback circuit, meaning the module cannot verify whether the VAPS solenoid is being energized correctly. The system will default to a fixed steering assist level, losing speed-sensitive steering feel.
Common Causes
35%
Broken wire in the VAPS II circuit harness, commonly near the steering gear where flex and heat cause wire fatigue
30%
Disconnected or backed-out pin at the VAPS solenoid connector or steering module connector
25%
Open VAPS II solenoid coil due to internal thermal damage or corrosion
10%
Corroded inline splice or junction in the VAPS circuit
Diagnostic Steps
1
Step 1: Measure VAPS solenoid coil resistance at the solenoid connector (typical: 4-8 ohms). An OL (infinite) reading confirms an open coil.
2
Step 2: If the coil is good, test continuity of each wire from the solenoid connector to the steering module connector to isolate the open wire.
3
Step 3: Inspect the harness routing near the steering gear and subframe where heat and vibration cause the most damage. Check for brittle insulation or cracked wires.
4
Step 4: Verify connector terminals are fully seated with proper retention force. Check for backed-out pins by gently tugging on individual wires at the connector.
5
Step 5: Repair the open with a weatherproof solder connection or replace the solenoid if internally failed. Verify proper PWM control after repair.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The steering module has detected an open circuit in the VAPS II control loop. There is a complete break in the electrical path of the solenoid feedback circuit, meaning the module cannot verify whether the VAPS solenoid is being energized correctly. The system will default to a fixed steering assist...
The most common cause of C1898 (Steering VAPS II Circuit Loop Open) is: Broken wire in the VAPS II circuit harness, commonly near the steering gear where flex and heat cause wire fatigue
Typical repair costs for C1898 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An open VAPS circuit causes loss of speed-sensitive steering assist. The steering may feel abnormally heavy at parking speeds or too light at highway speeds, increasing the risk of loss of control.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1898 to identify the root cause.
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Quick Info
Category
Chassis
System
Variable Assist Power Steering (VAPS)
Difficulty
Type
Manufacturer
Recommended Tools
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