Error Code P2777: What It Means & What To Do?

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The trouble code P2777 can be elucidated as Upshift Switch Circuit Issue. P2777 means there is some fault with a circuit for the upshift switch, which is generally because of a disabled manual shifter. This error code would indicate an issue in the electrical circuit of the upshift switch to the transmission range correlation circuit. The switch, wiring, connectors, and mode actuator are included in the circuit and it is used in automobiles which have manually shifting automatic transmissions.

When the PCM (Powertrain Control Module) detects a high voltage in the upshift switch circuit for the tap shifting automatic transmission vehicle, OBD code P2777 gets stored and the Check engine light may flash on the dashboard along with disabled tapping shifts.

What causes this problem with the Upshift Switch Circuit High?

• The wiring and connectors might be shorted or disconnected
• Failed shifter lever and associated circuit
• Transmission control module might need reprogramming
• Problem of liquids spilled on the upshift/downshift switch

1. Engine Control Module - Is your car engine light still staying ON after resetting or your car engine is turning off for no reason? Then these are some common symptoms indicating that your car engine control module is defective.
2. Powertrain Control Module - The PCM works as the central computer system in an automobile’s mechanism. This auto part is in charge of all the constituents as well as the functions performed by them. Having such enormous importance in the operation of all the parts means that any defect in it will affect almost every aspect of a car.
3. Electronic Control Unit - The ECU is a major component of your car's onboard computer. It's used to regulate many systems and subsystems in your car's engine, drive train and other major components. Visit us to buy best quality ECU online.
4. Diagnostic Tools - Take the help of a professional mechanic to diagnose OBD code error. Use high grade diagnostic tools to resolve this issue. Buy new tools and equipment form us!
5. Transmission Control Module - The TCM monitor the transmission system of the vehicle and if it becomes faulty, the vehicle will have transmission performance issue. Thus, replace and reprogram it now!
6. Automatic Transmission Switch - A failed transmission upshifter switch will lead to disabled tap shifting and affected transmission system. Thus, replace the defective switch and replace it immediately.
7. Shift Lever - If the shift lever has failed, the driver will be unable to shift between gears, causing transmission failures and serious damage to various mechanical components leading to hefty repair costs. Thus, replace the faulty shift lever in time.

Willing to know some common symptoms of OBD Code P2777? Your wish is our demand. Have a look at them below:

Common Symptoms

• Harsh shifting
• Transmission slippage
• Transmission overheating
• Decreased fuel efficiency
• An OBD stored code in the PCM
• Vehicle unable to upshift gears
• Illuminated malfunction indicator lamp

We have listed out some ways which would help you to correct the occurrence of OBD Code P2777. They are mentioned here as follows:

• Rehabilitate the defaults in the upshift switch or actuator
• You must fix the defective circuits, connectors, and components
• Make sure to mend the faulty wiring and connectors
• Replace the upshift solenoid if it is not working properly.
• It is essential to restore the flawed PCM
• Repair or replace the quirky switch

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• You should execute a visual inspection of all wiring, connectors, and constituents related with the upshift/downshift switch circuit.
• Now if everything turns out in good condition, then you should attach the scanner to the diagnostic connector and all freeze frame data and stored trouble codes should be downloaded as it would be very helpful further diagnosis.
• The next step is to clear the code and see if it returns upon testing the system.
• If the code returns check the reference voltage and ground signal of the upshift switch and actuator.
• If either is open, then all the related control modules should be disconnected before the continuity is being tested as well as resistance of all circuits. Disconnect the modules as it would be helpful in preventing the damage from a misplaced investigation when the circuits are being checked.
• The manufacturer's wiring diagram should also be used by a mechanic to test all related circuits using the volt/ohmmeter and then compare their findings to the manufacturer's specifications.
• After that, the code should be cleared up and the entire system should be tested once again, by utilizing a scanner to manually activate the upshift switch.
• Now if the code is returning once again, then you should disconnect and test the powertrain control module for the default.
• The mechanic can also inspect the normal/performance switch if the transmission mode selector fails to operate manually.
• Then you should clear the code once more and test the system to see if the trouble code is returning back again or not.

Common Mistakes When Diagnosing the P2777 Code

The most common mistake while diagnosing P2777 code is misdiagnosis of an engine misfiring issue or a problem with the vehicle’s driveline. If the system is not thoroughly inspected and diagnosed, it can also look like an internal transmission problem when it’s actually a much simpler and less expensive issue.