What Does C1887 Mean?
The air suspension module has detected a short-to-battery (high voltage) condition on the right rear height sensor signal circuit. The signal wire has made contact with a power source, causing the module to see a constant high voltage reading instead of the variable height signal. This can cause the module to misinterpret the RR corner as fully extended, potentially deflating the RR air spring to dangerous levels.
Common Causes
40%
Chafed RR height sensor signal wire contacting a nearby power wire in the harness bundle due to worn insulation
30%
Internal sensor failure where the signal output has shorted to the 5V reference supply inside the sensor housing
20%
Contaminated or damaged connector with pin-to-pin bridging between signal and power circuits
10%
Module internal pull-up circuit malfunction on the RR sensor input
Diagnostic Steps
1
Step 1: Disconnect the RR height sensor and measure voltage on the signal pin at the sensor connector (key on). If it drops to near 0V, the short is internal to the sensor. If it remains high, the fault is in the wiring.
2
Step 2: With sensor disconnected, check resistance from the signal wire to battery positive and to the 5V reference wire. Low resistance confirms a harness short.
3
Step 3: Trace the harness from sensor to module, looking for abraded insulation where wires contact each other or aftermarket accessories have been spliced in.
4
Step 4: Clean and inspect both connectors for corrosion, debris, or moisture that could bridge pins. Check for bent pins contacting adjacent terminals.
5
Step 5: Replace the sensor if internal short is confirmed. After repair, verify proper voltage sweep through full suspension travel and clear codes.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The air suspension module has detected a short-to-battery (high voltage) condition on the right rear height sensor signal circuit. The signal wire has made contact with a power source, causing the module to see a constant high voltage reading instead of the variable height signal. This can cause the...
The most common cause of C1887 (Air Suspension RR Height Sensor Circuit Short To Battery) is: Chafed RR height sensor signal wire contacting a nearby power wire in the harness bundle due to worn insulation
Typical repair costs for C1887 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A high-voltage fault on the RR height sensor can cause the system to incorrectly lower the rear right corner, creating an asymmetric ride height that compromises handling stability and braking performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1887 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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