P2778 OBD Error Code: Problem & Solutions

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The trouble code P2778 can be described as Upshift Switch Circuit Intermittent/Erratic Issue. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

If the PCM detects that the upshift switch circuit has malfunctioned and behaving erratic with the input or output voltages out of manufacturer’s specifications, OBD code P2778 gets stores and flashed by the system.

What causes this problem with the Upshift Switch Circuit Intermittent/Erratic?

• Malfunctioned upshift/downshift switch
• Malfunctioning electrical components
• Inoperative wires and connectors
• PCM programming error

1. Engine Control Module - If there is any corrosion or breaks in the internal wiring of the harness, then it can cause a short in the ECM or can also cause corrosion in the ECM through the wiring harness. You can always rely on us as we have the best auto parts for our customers.
2. Powertrain Control Module - The onboard computer, or powertrain control module is the brain of the engine control system. Now if the brain is not working properly, then neither is the car engine. Get it replaced before the situation gets worse.
3. Electronic Control Unit - Is your car jump starting on reverse polarity? Or are you facing some intermittent starting issues? If yes, then it indicates that your electronic control unit is bad. So it is very important to replace the defective electronic control unit with us at equitable prices.
4. Diagnostic Tools - Buy quality diagnostic tools to check and diagnose OBD code P2778 error with the help of experienced mechanic. Visit us today!
5. Automatic Transmission Control Module - TCM can be faulty and transmit wrong voltage reading to the PCM thus causing performance issues. Buy and replace new TCM now!
6. Automatic Transmission Switch - Inspect for faulty transmission upshift switch that can cause erratic gear shifts and malfunctioned transmission system and replace them immediately. Buy new transmission switch from us now!
7. Shift Lever - Check for malfunctioned shift lever that may lead to disabled gear shifts and damaged transmission parts and replace the faulty shift lever now!

We at Parts Avatar Canada care for our customers, and that’s why we will help you to diagnose P2778 code by listing out some major symptoms. They are mentioned below as follows:

Common Symptoms

• Delayed shifting or vehicle not shifting into the right gear
• Transmission slipping
• Decrease in fuel efficiency
• Speedometer not running
• Check Engine Light illumination
• Engine stalling and misfiring

Have a look at some ways with which you can correct the P2778 code:

• You must fix the defective upshift switch
• It is essential to restore the flawed electrical components
• Replace damaged, corroded and cut wiring and broken connector pins
• The malfunctioning powertrain control module should be repaired or replaced as per the need

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of Automatic Transmission, Engine Control Module, ECM, Rocker Arms, PCM, Body Control Module, BCM and a lot more. We are sure that now all your issues would be resolved.

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

The P2778 error code can be diagnosed by utilizing an OBD-II trouble code scanner. A scanner should be used by a professional technician to notice the freeze frame data, to assemble details about the code. The mechanic can also check to see if there is presence of additional trouble codes. Now if there are a number of codes, then they should be addressed in the same order in which they are appearing on the scanner. After that the mechanic should reset the trouble codes, restart the vehicle, and check to see if the code remains detected. If it does not, then the code was likely triggered incorrectly, or represents an intermittent issue.

Now if you find out that the P2778 error code remains detected, then the technician should undergo a visual inspection of the electrical components in the automatic transmission. You should restore any open or shorted wires, or defective or corroded connectors. Then examine the upshift switch and you can always replace it if it is faulty.

If you are still not able to find the issue, then you should inspect the reference voltage and ground signals, and a digital volt/ohmmeter can be utilized to test for resistance and continuity between all the circuits.

Once any constituent is being replaced, then the trouble codes should be retested by the technician. Then restart the vehicle, and once again inspect to see if the codes return. This is done so that the mechanic would be able to find out that the issue has been solved.

Common Mistakes When Diagnosing the P2778 Code

• Improper check for transmission fluid and solenoids
• Simply replacing the Powertrain Control Module (PCM) or Transmission Control Module without considering other possibilities of problem
• Transmission switch failure
• Not noticing the damaged or loosened wiring and circuit problems