What Does C1135 Mean?
This code indicates the control module has detected that the gear shift position sensor circuit is shorted to battery voltage. The signal wire is receiving unwanted high voltage, preventing the module from reading true gear position. This typically results from insulation failure allowing the signal wire to contact an adjacent power wire or a shorted sensor.
Common Causes
35%
Chafed wiring where the gear position signal wire contacts a power wire in the transmission harness bundle
25%
Failed gear shift position sensor with internal short between signal and power circuits
25%
Corroded or heat-damaged connector with pin-to-pin bridging between signal and power terminals
15%
Incorrect wiring repair or pinched harness routing near exhaust components causing insulation melting
Diagnostic Steps
1
Step 1: Disconnect the gear shift position sensor and measure voltage on the signal wire at the module connector. If battery voltage persists, the short to battery is in the wiring harness.
2
Step 2: With the sensor disconnected, test for continuity between the signal wire and any battery voltage supply wires in the harness. Continuity confirms a wire-to-wire short.
3
Step 3: Inspect the harness visually along its entire routing path, especially near hot exhaust components and areas of mechanical contact. Check for melted insulation or aftermarket splices.
4
Step 4: Test the sensor internally by measuring resistance between the signal terminal and the power supply terminal. Low resistance indicates internal sensor failure.
5
Step 5: Repair or replace the faulty component, clear codes, and verify proper gear position signal voltage in live data through all gear positions.
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
This code indicates the control module has detected that the gear shift position sensor circuit is shorted to battery voltage. The signal wire is receiving unwanted high voltage, preventing the module from reading true gear position. This typically results from insulation failure allowing the signal...
The most common cause of C1135 (Gear Shift position short to battery) is: Chafed wiring where the gear position signal wire contacts a power wire in the transmission harness bundle
Typical repair costs for C1135 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Traction control may be disabled. Vehicle is safe to drive but electronic drivetrain management is impaired. Repair at convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1135 to identify the root cause.
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Quick Info
Category
Chassis
System
Transmission / Drivetrain Control
Difficulty
Type
Manufacturer
Recommended Tools
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