What Does C1894 Mean?
The air suspension module has identified an open circuit in the left rear height sensor wiring. A break exists somewhere in the circuit between the module and the LR sensor, preventing any height data from reaching the controller. This completely disables height monitoring at the LR corner and typically forces the system into fault mode.
Common Causes
35%
Broken or severed wire in the LR height sensor harness from road debris or fatigue at suspension flex points
30%
Disconnected or backed-out terminal at the sensor or module connector
25%
Internal open in the LR height sensor element due to age or contamination
10%
Corroded terminals creating effectively infinite resistance at contact points
Diagnostic Steps
1
Step 1: Verify the LR height sensor connector is fully seated and locked. Check for obvious disconnection.
2
Step 2: Measure continuity on signal, reference, and ground wires from sensor connector to module connector to identify the open circuit.
3
Step 3: Section the harness to locate the break. Focus on body pass-throughs, near axle mounting, and areas exposed to road debris.
4
Step 4: Test sensor internally for open readings per manufacturer specification.
5
Step 5: Repair with proper weatherproof connections, reroute harness away from hazards, and verify sensor signal output before clearing codes.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The air suspension module has identified an open circuit in the left rear height sensor wiring. A break exists somewhere in the circuit between the module and the LR sensor, preventing any height data from reaching the controller. This completely disables height monitoring at the LR corner and typic...
The most common cause of C1894 (Air Suspension LR Height Sensor Circuit Open) is: Broken or severed wire in the LR height sensor harness from road debris or fatigue at suspension flex points
Typical repair costs for C1894 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without LR height feedback, the rear left corner operates without position monitoring. This can lead to incorrect air spring pressure and uneven vehicle stance affecting handling and stability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1894 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
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