[SOLVED] P1765 Code: Fixing Transmission 12V Supply Relay Control Conditions

The automobile fault code P1765 indicates a problem with the Transmission Control Relay. This can cause the Engine Light to turn on or the Service Engine Soon Warning Light to illuminate. The possible causes include a faulty relay, an open or shorted relay harness, or a poor electrical connection in the relay circuit.

To fix this issue, you should visually inspect the wiring harness and connectors for any damage.

Look for broken, bent, pushed out, or corroded pins in the connectors.

The repair time for this problem is estimated to be around 1.0 hour. It is important to address this issue promptly to prevent further damage to the transmission.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p1765 fault code.

  • The symptoms of the automobile fault code P1765 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p1765 can be caused by a faulty Transmission Control Relay, an open or shorted Transmission Control Relay harness, or a poor electrical connection in the Transmission Control Relay circuit.

INNOVA 5210
Get an OBD Scanner for accurate, Your car-specific Error Diagnosis
  • Pinpoints your car-specific issues, giving accurate diagnostics for your exact make and model.
  • Works anywhere, even with limited connectivity, making it highly versatile.
  • Provides detailed insights into real-time performance for your exact make and model, beyond generic online explanations.
  • Tracks past issues of your vehicle, helping you spot recurring problems and monitor long-term performance, which online resources can’t offer.
  • Detects potential issues early, helping avoid costly repairs instead of just addressing current problems.
  • Regular checks support efficiency and emissions standards, potentially increasing resale value—hard to gauge with online info alone.
Buying through our links may earn us commission.

  • The fault code P1765 can be caused by the following: a faulty Transmission Control Relay, an open or shorted Transmission Control Relay harness, and a poor electrical connection in the Transmission Control Relay circuit.

To fix the p1765 fault code, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code P1765, you need to follow these steps: 1.
  • Check the possible causes mentioned above.
  • 2.
  • Visually inspect the wiring harness and connectors related to the fault code.
  • 3.
  • Look for any damaged components.
  • 4.
  • Check for broken, bent, pushed out, or corroded pins in the connectors.
  • The estimated repair time for this fix is 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p1765 are the estimated repair time of 1.0 hour and the typical hourly rate charged by auto repair shops, which ranges from $75 to $150.

The P1765 fault code is related to the transmission control voltage status.

When the Powertrain Control Module (PCM) detects that the transmission control voltage with the solenoid off is 0v (instead of the expected 12v) or 12v with the solenoid on, it triggers this code. In simpler terms, this fault code indicates an issue with the transmission 12V supply relay control. The relay is responsible for controlling the voltage supply to the transmission system.

When the PCM detects that the voltage is not within the expected range, it sets the P1765 code.

If you encounter this fault code, it is important to have it addressed promptly. Ignoring it can lead to transmission problems and potential damage.

A qualified mechanic should diagnose the exact cause of the issue and perform the necessary repairs to restore proper functioning of the transmission control voltage.

What are the possible causes of the automobile fault code P1765?

If you see the engine light or service engine soon warning light on, the fault code P1765 could be the culprit. This code is often caused by a faulty transmission control relay or issues with the relay’s harness. To fix the problem, start by visually inspecting the wiring harness and connectors. Look for any signs of damage or corrosion. Additionally, check for broken, bent, pushed out, or corroded pins on the connectors. Taking these steps can help you identify and resolve the issue.

How can I visually inspect the wiring harness and connectors to fix the P1765 fault code?

To fix the P1765 fault code, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check if there are any broken, bent, pushed out, or corroded pins in the connectors. This can help identify any issues with the Transmission Control Relay or poor electrical connections. Don’t forget to check the “Possible Causes” listed above for further troubleshooting.

What should I look for when checking for damaged components and connector pins to resolve the P1765 fault code?

When resolving the P1765 fault code, start by checking for damaged components and connector pins. This can be done by visually inspecting the related wiring harness and connectors. Look for any signs of damage such as broken, bent, pushed out, or corroded connector pins. By doing this, you can identify any issues that may be causing the fault code and take the necessary steps to fix them.

p1765 error fault code explained

If you’re seeing the Engine Light ON or the Service Engine Soon Warning Light, it could be due to a faulty Transmission Control Relay. To fix this, visually inspect the wiring harness and connectors, checking for any damage or corrosion.

Look out for broken, bent, pushed out, or corroded connector pins.

Scroll to Top