What Does C1134 Mean?
This code indicates the control module has detected that the gear shift position sensor circuit is shorted to ground. The gear shift position sensor provides the control module with information about which gear the manual transmission is in. A short to ground causes the module to see a constant low or zero-voltage signal, preventing accurate gear position determination for traction control and other drivetrain management functions.
Common Causes
35%
Damaged wiring harness at the transmission gear position sensor where it is exposed to road debris and moisture
25%
Failed gear shift position sensor with internal short to ground from vibration or fluid contamination
25%
Corroded connector at the transmission causing signal pin to short to the grounded connector shell
15%
Pinched or rubbed-through wiring near the shifter linkage or transmission bellhousing
Diagnostic Steps
1
Step 1: Disconnect the gear shift position sensor connector at the transmission and check if the code changes to an open circuit code. If it does, the sensor is internally shorted. If the short remains, the wiring is at fault.
2
Step 2: With the sensor disconnected, measure resistance from the signal wire at the control module connector to chassis ground. Less than 100 ohms confirms a harness short to ground.
3
Step 3: Visually inspect the wiring harness along the transmission, near the shifter mechanism, and at the firewall pass-through for abrasion, cuts, or pinch points.
4
Step 4: Test the sensor by measuring resistance between its signal pin and the sensor housing (ground). Compare to manufacturer specifications — should not show low resistance to case ground.
5
Step 5: Repair or replace the failed component, clear codes, and verify proper gear position readings in live data while shifting through all gears.
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 ground. The gear shift position sensor provides the control module with information about which gear the manual transmission is in. A short to ground causes the module to see a constant low ...
The most common cause of C1134 (Gear Shift position short to ground) is: Damaged wiring harness at the transmission gear position sensor where it is exposed to road debris and moisture
Typical repair costs for C1134 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Traction control and cruise control may be disabled. Vehicle is safe to drive manually 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 C1134 to identify the root cause.
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Quick Info
Category
Chassis
System
Transmission / Drivetrain Control
Difficulty
Type
Manufacturer
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