What Does C1917 Mean?
The steering control module has detected an out-of-range condition in the Electronic Variable Orifice (EVO) steering system. The EVO system modulates hydraulic flow through the power steering gear to provide variable assist, and this code indicates the control signal or feedback value has exceeded the module's expected operating range. Steering assist may become erratic, unusually heavy, or unusually light.
Common Causes
35%
Failed EVO actuator with internal solenoid or valve producing out-of-specification response to commanded inputs
30%
Intermittent wiring fault in the EVO control circuit causing signal dropouts or voltage spikes
20%
Faulty vehicle speed sensor input to the steering module, causing incorrect speed-dependent calculations
15%
Steering control module software calibration error or internal fault generating out-of-range commands
Diagnostic Steps
1
Step 1: Measure the EVO solenoid coil resistance (typical: 4-8 ohms). Compare to manufacturer specification and check for intermittent readings by wiggling the connector.
2
Step 2: Monitor the EVO commanded duty cycle vs. actual current draw using an oscilloscope while sweeping from parked to highway speed. Both should track linearly.
3
Step 3: Verify the vehicle speed signal input to the steering module is accurate by comparing it to the speedometer reading and ABS wheel speed data.
4
Step 4: Check the power steering fluid level and condition. Low fluid or aerated fluid can cause erratic EVO operation and out-of-range feedback.
5
Step 5: If all inputs and wiring check good, reprogram or replace the steering control module per manufacturer bulletin. Some vehicles require EVO recalibration after module replacement.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The steering control module has detected an out-of-range condition in the Electronic Variable Orifice (EVO) steering system. The EVO system modulates hydraulic flow through the power steering gear to provide variable assist, and this code indicates the control signal or feedback value has exceeded t...
The most common cause of C1917 (Steering EVO Out-of-Range Fault) is: Failed EVO actuator with internal solenoid or valve producing out-of-specification response to commanded inputs
Typical repair costs for C1917 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Out-of-range EVO operation can cause unpredictable steering assist levels. Steering may suddenly become very heavy or very light, creating a dangerous situation during highway driving or emergency maneuvers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1917 to identify the root cause.
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Quick Info
Category
Chassis
System
Electronic Variable Orifice (EVO) Power Steering
Difficulty
Type
Manufacturer
Recommended Tools
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