P0763 code definition
P0763 indicates a problem with Shift Solenoid C Electrical.
What the P0763 code means
The PCM (powertrain control module) in a vehicle with an automatic transmission utilizes shift solenoids in order to facilitate the various transmission gear ratios required to increase and decrease speed. These solenoids are instrumental in fluid transfer between hydraulic circuits and actuation of gear ratio changes. These changes optimize engine performance and enhance fuel efficiency. When your vehicle stores code P0763, it means that the PCM has detected an aberration in the function of shift solenoid C, indicating that the intended gear ratio doesn’t match up with the actual gear ratio.
What causes the P0763 code?
A shift solenoid C fault can be caused by one or more of the following:
- Clogged internal transmission fluid passageways
- Contaminated transmission fluid
- Mechanical transmission failure
- Low transmission fluid
- A faulty shift solenoid
- A faulty TCM (transmission control module) or PCM
What are the symptoms of the P0763 code?
When your vehicle stores this code you may not notice any symptoms at all, or you may experience rough shifting, slippage during shifting, transmission overheating, or complete transmission failure resulting in an inability to put the vehicle into any gear. You may also notice decreased fuel economy, an illuminated Check Engine light, and other stored shift solenoid codes. In addition, the vehicle may enter “limp” mode, which is a reduced power mode designed to allow you to make it to a mechanic. You should not drive the vehicle any significant distance in limp mode.
How does a mechanic diagnose the P0763 code?
Your technician should always begin by using a code reader to verify the faults that are stored in the vehicle’s computer. If there are any others aside from P0763, these should be diagnosed and addressed in the order they occurred. Next the transmission fluid should be checked for level and condition. Burned or contaminated fluid can indicate a serious mechanical failure within the transmission. The transmission pan will be inspected for debris. If debris is present, then the entire transmission will need to be rebuilt. If the fluid level is low but contains no contaminants, there may be a leak somewhere in the system. Your technician will look for corroded or shorted wiring and connectors, and make sure your vehicle is registering the correct voltage and resistance. He or she will also measure pump pressure to ensure that the pump is working properly.
Common mistakes when diagnosing the P0763 code
The complete recommended diagnostic protocol should be carried out. If parts are replaced without testing all associated components, expensive, unnecessary repairs may result. You should also pay special attention to your vehicle’s oil pressure, and if your oil passages are clogged with dirt or debris, make sure that you clean them thoroughly.
How serious is the P0763 code?
This is an extremely serious code and should be diagnosed and repaired before driving the vehicle a significant distance. Even if the problem is just a leak causing low transmission fluid and pressure, driving under these conditions can cause vital components to sustain damage, potentially requiring very expensive transmission repairs.
What repairs can fix the P0763 code?
Repairing a shift solenoid problem may involve one or more of the following:
- A transmission fluid flush and refill
- Shift solenoid replacement
- Wiring and/or connector replacement
- Clearing of clogged hydraulic passages
- Electronic pressure regulator replacement
- Transmission pump replacement
- Complete transmission rebuild
Additional comments for consideration regarding the P0763 code
Some vehicles are equipped with a transmission fluid dipstick that allows you to check the fluid level and condition yourself. If the fluid is low, but doesn’t have a burned smell or appearance, and is clear and normal, fluid may be added. However, if there is a leak causing the low fluid condition, it’s best to have a professional mechanic diagnose and repair the issue, unless you’re an experienced mechanic and have the skill and facilities to make such a major repair.
Need help with a P0763 code?
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.