P0763: Shift Solenoid ‘C’ Electrical DTC Trouble Code

The ECU controls each shift solenoid by sending electrical current through a coil of wire that’s wrapped around the solenoid’s plunger mechanism. If the ECU detects an electrical issue, then it will generate a P0763 diagnostic trouble code.

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What Transmission Do I Have?

How Serious is the Code?

Although the transmission problems associated with a P0763 DTC may only be intermittent, they will eventually get worse and affect the drivability and safety of your vehicle.

Symptoms

Symptoms of a P0763 include:

• Check engine light
• Limp mode
• Harsh, erratic shifts
• Slipping
• Engine stalls while stopped in gear
• Vehicle won’t move in gear
• Increased fuel consumption
• Transmission overheats

Causes

• Insufficient transmission fluid
• Dirty transmission fluid / filter
• Frayed wiring / damaged connectors
• Failing solenoid
• Failing transmission pump
• Internal pressure problems
• Valve body issue
• ECU or TCM failure

How to Diagnose the Code?

The first thing that a mechanic should look at when diagnosing a solenoid related fault code is the level and condition of the transmission fluid. If it’s excessively dirty, or metal shavings are present, then the transmission could have serious internal damage. Regular maintenance is an easy way to extend the life of your transmission. Failing to have your transmission serviced on time, will result in catastrophic wear to internal components, which include the solenoids. It is possible to flush the transmission and clear blocked hydraulic passages. However, this may only be a temporary fix if damage has already been done to the valve body, clutches or seals.

If the transmission fluid is clean and there are no leaks, then the wiring harness and connectors should be carefully examined for signs of damage and corrosion. If no issues are found, then the shift solenoid should be tested directly following the manufacturers recommended test procedure. If the solenoid functions properly, then other components like the valve body, pressure regulator valve, or transmission pump, could be at fault.

Common Mistakes When Diagnosing

Many times, the shift solenoid could be blamed for the fault, when it could actually be dirty transmission fluid, or a clogged hydraulic passage. The solenoid may also need to be tested in a specific way, like while the engine is running, or in a particular gear. Failure to follow the correct procedures could cause the solenoid to appear faulty when it actually isn’t.

What Repairs Will Fix P0763?

• Change the transmission fluid and filter
• Replace failed shift solenoid
• Replace or repair failed transmission pump
• Repair or replace transmission valve body
• Perform a transmission flush to clear passages
• Repair or replace damaged wiring
• Clean corrosion from connectors
• Flashing or replacing PCM/TCM
• Install a rebuilt or remanufactured transmission

Related Codes

P0760 – Shift Solenoid ‘C’

P0761 – Shift Solenoid ‘C’ Performance or Stuck Off

P0762 – Shift Solenoid ‘C’ Stuck On

P0764 – Shift Solenoid ‘C’ Intermittent

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

Full Transmission DTC Codes Table