C1136 — Gear Select Position Short to Ground #

Note: The code label may vary depending on the vehicle manufacturer (OEM).

• Gear Shift Position Sensor Circuit Short to Ground (Nissan)
• Gear Selector Switch Signal Low (Renault)
• Transmission Range Sensor Shorted to Ground (Infiniti)
• Selector Lever Position Circuit Low (Mitsubishi)

Summary of Diagnostic Code C1136 #

C1136 is a diagnostic trouble code (DTC) that indicates a short to ground in the gear select position circuit, also known as the gear selector or transmission range sensor circuit. This code is triggered when the vehicle’s onboard computer (ECU—Engine Control Unit) detects an electrical signal that is unusually low, suggesting a direct path to ground. The gear select position sensor tells the ECU which gear is currently selected (Park, Reverse, Neutral, Drive, etc.), and is vital for both automatic and semi-automatic transmissions. If this circuit malfunctions, it can lead to shifting issues or prevent the vehicle from starting. Prompt diagnosis and repair are important for vehicle safety and drivability.

Common Symptoms for Code C1136 #

When the C1136 code is present, your vehicle may display a range of symptoms, from subtle to severe. These can interfere with normal driving or even prevent your car from moving. Here are the most frequently observed signs:

• Transmission stuck in one gear or fails to shift
• Transmission warning or check engine light illuminated
• Vehicle won’t start, especially in Park or Neutral
• Gear indicator on dashboard does not match actual gear
• Unusual shifting behavior or hesitation

Most Common Causes for Code C1136 #

Several factors can trigger a short to ground in the gear select position circuit. Some causes are more typical than others. Below are the most likely reasons, ordered by frequency:

1. Damaged or frayed wiring in the gear position sensor circuit
2. Faulty gear select position sensor (sometimes called the transmission range sensor)
3. Corroded or loose connectors at the transmission or sensor harness
4. Water intrusion in the connector or wiring harness
5. Electrical short within the ECM/TCM (Engine/Transmission Control Module)
6. Incorrect installation of aftermarket components

Step-by-Step Diagnosis for Code C1136 #

Diagnosing a C1136 code requires a systematic approach to rule out each possible cause. Here’s how a professional technician would typically proceed:

1. Check for other DTCs and record all freeze frame data.
2. Inspect the gear select position sensor and associated wiring for visible damage or corrosion.
3. Test the sensor circuit for continuity and check for a short to ground using a digital multimeter.
4. Disconnect the sensor and check if the short to ground persists—this helps isolate if the issue is within the sensor or wiring.
5. Verify all connector pins are secure and free of moisture or debris.
6. If wiring and sensor check out, test the control module (ECM/TCM) output for faults.
7. Clear the code and perform a road test to confirm the repair.

Possible Repairs for Code C1136 #

The solution for C1136 depends on the underlying cause. Once the specific issue is found, here are the most common repairs:

• Repair or replace damaged wiring in the gear select position circuit
• Replace the gear select position sensor or transmission range sensor if faulty
• Clean or replace corroded connectors and ensure they are properly sealed against moisture
• Repair or replace the ECM/TCM if an internal fault is detected
• Reinstall or correct any aftermarket modifications affecting the circuit

Is It Safe to Drive with Code C1136? #

Limited. Driving with code C1136 is not recommended, especially if you experience symptoms like the vehicle being stuck in gear or unable to start. This code can affect your ability to shift or even prevent the vehicle from moving. Continuing to drive may cause further damage or leave you stranded. It’s best to have the issue diagnosed and repaired as soon as possible.

Vehicles Most Commonly Affected by Code C1136 #

This code is most frequently found on vehicles equipped with electronically controlled transmissions, particularly those from Japanese OEMs. Here are some examples:

• Nissan Altima, Maxima, Pathfinder
• Infiniti G35, QX60, FX35
• Renault Koleos, Laguna (shared platform)
• Mitsubishi Outlander, Lancer
• Other vehicles using similar automatic transmission systems

Common Mistakes & Best Practices for Code C1136 #

Misdiagnosis and incorrect repairs can lead to repeat issues or unnecessary costs. Here’s how to avoid common pitfalls:

• Assuming the sensor is faulty without checking wiring first
• Overlooking water intrusion or corrosion at connectors
• Clearing codes without addressing the underlying fault
• Failing to test the circuit for continuity and shorts before replacing parts
• Best practice: Always follow OEM diagnostic flowcharts and use a quality scan tool
• Best practice: Inspect connectors and wiring visually and electrically

Express FAQ for Code C1136 #

If you have questions about C1136, you’re not alone. Here are answers to some of the most common concerns:

• Q: Can I clear the C1136 code myself?
  A: You can clear the code with a scan tool, but if the underlying issue isn’t fixed, the code will return.
• Q: Does this code mean I need a new transmission?
  A: Not usually. Most often, the issue is with wiring, connectors, or the sensor itself—not the entire transmission.