What Does C1150 Mean?
This code indicates the control module has detected that the two-speed rear axle input switch circuit is shorted to battery voltage. The two-speed rear axle switch informs the ABS/traction control module which axle ratio is currently selected (high or low range), which is necessary for accurate wheel speed calculations. A short to battery provides a constant high signal that masks the actual switch position.
Common Causes
35%
Chafed wiring where the axle switch signal wire contacts a power wire in the underbody harness
25%
Failed two-speed axle switch with internal short to the power circuit
25%
Corroded connector at the axle switch allowing moisture bridge between signal and power terminals
15%
Previous wiring repair with incorrect splice routing near the rear axle
Diagnostic Steps
1
Step 1: Locate the two-speed axle switch on the rear differential housing. Disconnect the connector and check if battery voltage is still present on the signal wire at the module side. If so, the short is in the harness.
2
Step 2: With the switch disconnected, check continuity between the signal wire and all power supply wires in the harness to locate a wire-to-wire short.
3
Step 3: Inspect the wiring harness along the underside of the vehicle from the axle to the module, focusing on areas near heat sources, sharp edges, and mounting brackets.
4
Step 4: Test the switch by measuring resistance between its terminals in both positions. Compare to manufacturer specifications. Check for short between signal pin and power pin.
5
Step 5: Repair or replace the faulty component, clear codes, and verify proper switch signal in live data while cycling the axle between high and low range.
Estimated Repair Cost
$80 - $300
Parts + labor, varies by vehicle and location
This code indicates the control module has detected that the two-speed rear axle input switch circuit is shorted to battery voltage. The two-speed rear axle switch informs the ABS/traction control module which axle ratio is currently selected (high or low range), which is necessary for accurate whee...
The most common cause of C1150 (Two Speed Rear Axle Input Switch Circuit Short to Vbatt) is: Chafed wiring where the axle switch signal wire contacts a power wire in the underbody harness
Typical repair costs for C1150 range from $80 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS and traction control may use incorrect axle ratio for calculations, potentially causing false ABS activation or impaired traction control. Vehicle is drivable. Repair at earliest convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1150 to identify the root cause.
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Quick Info
Category
Chassis
System
Two-Speed Rear Axle / Traction Control
Difficulty
Type
Manufacturer
Recommended Tools
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