What Does C1899 Mean?
The steering module has detected a short-to-battery condition in the VAPS II circuit loop. A voltage source is feeding into the circuit, causing the module to detect abnormally high current or voltage where it should see a controlled signal. This can damage the solenoid driver in the module or cause the solenoid to be continuously energized at maximum, resulting in very light steering effort.
Common Causes
40%
Chafed VAPS circuit wire contacting a 12V power feed wire in the engine bay harness
25%
Internal solenoid fault with coil winding shorted to the solenoid power supply terminal
25%
Contaminated connector with conductive fluid (power steering fluid or water) bridging between power and signal pins
10%
Steering module internal driver circuit fault feeding voltage back into the loop
Diagnostic Steps
1
Step 1: Disconnect the VAPS solenoid and measure voltage on the control wire at the harness side (key on). If voltage is present with solenoid disconnected, the short is in the wiring.
2
Step 2: Check resistance from each VAPS circuit wire to battery positive to identify the shorted wire.
3
Step 3: Inspect the harness near the steering gear, power steering pump, and engine for chafing against hot surfaces or sharp edges.
4
Step 4: Check the solenoid connector for power steering fluid contamination, which is conductive and can bridge pins. Clean and reseal.
5
Step 5: After isolating and repairing the short, verify proper solenoid operation by monitoring duty cycle and current draw with an oscilloscope.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The steering module has detected a short-to-battery condition in the VAPS II circuit loop. A voltage source is feeding into the circuit, causing the module to detect abnormally high current or voltage where it should see a controlled signal. This can damage the solenoid driver in the module or cause...
The most common cause of C1899 (Steering VAPS II Circuit Loop Short To Battery) is: Chafed VAPS circuit wire contacting a 12V power feed wire in the engine bay harness
Typical repair costs for C1899 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A short-to-battery in the VAPS circuit can cause maximum steering assist at all speeds, making the steering dangerously light at highway speeds with reduced road feel, increasing the risk of overcorrection and 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 C1899 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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