What Does C0473 Mean?
This code indicates that the steering angle sensor (also called handwheel speed sensor) is sending a voltage signal to the control module that exceeds the maximum expected threshold. The sensor monitors steering wheel rotation speed and position for systems like electronic stability control, power steering assist, and lane keeping. The 'signal V high' condition means the sensor circuit is outputting voltage above normal operating range, typically above 4.8-5.0 volts.
Common Causes
45%
Faulty steering angle sensor with internal short to voltage or failed sensor electronics
30%
Damaged wiring harness or connector with short to battery voltage in signal circuit
15%
Control module fault causing incorrect voltage reference or signal processing error
10%
Corroded or damaged connector pins causing high resistance and voltage feedback
Diagnostic Steps
1
Step 1: Perform visual inspection of steering angle sensor connector and wiring at steering column for damage, corrosion, water intrusion, or pinched wires. Check for aftermarket installations near steering column that may have damaged wiring.
2
Step 2: Using a digital multimeter, backprobe the steering angle sensor signal wire at the connector and measure voltage with key on, engine off. Normal range is 0.5-4.5 volts depending on steering position. If reading is constantly above 4.8V, suspect sensor or wiring fault.
3
Step 3: Disconnect the steering angle sensor connector and measure voltage on the control module side of the harness signal wire. If voltage is still high (above 0.5V), there is a short to voltage in the wiring harness between sensor and module.
4
Step 4: If harness tests normal, measure resistance of sensor signal circuit to ground and to battery voltage with sensor disconnected. Should have high resistance (>10k ohms) to both. Low resistance indicates short circuit in harness.
5
Step 5: If wiring tests normal, reconnect sensor and monitor live data while slowly rotating steering wheel lock-to-lock. Erratic high voltage spikes indicate failed sensor requiring replacement.
6
Step 6: After repairs, perform steering angle sensor calibration procedure per manufacturer specifications (typically center steering wheel, cycle ignition, turn lock-to-lock). Clear codes and road test to verify repair, monitoring live data for proper sensor voltage range 0.5-4.5V.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates that the steering angle sensor (also called handwheel speed sensor) is sending a voltage signal to the control module that exceeds the maximum expected threshold. The sensor monitors steering wheel rotation speed and position for systems like electronic stability control, power s...
The most common cause of C0473 (Steering Handwheel Speed Sensor Signal V High) is: Faulty steering angle sensor with internal short to voltage or failed sensor electronics
Typical repair costs for C0473 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive but stability control, traction control, and power steering assist functions may be disabled or operating in limp mode. Avoid aggressive maneuvers and repair promptly as safety systems are compromised. Some vehicles may experience reduced steering assist or warning lights.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0473 to identify the root cause.
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Quick Info
Category
Chassis
System
Steering System / Electronic Stability Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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