P2776 - OBD Trouble Code

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Unresponsive tap shifting, improper shifts and reduced fuel economy are the major setbacks for this kind of a problem. In extreme cases engine stalling and vehicle dying while slowing can be crucial on the road and in extreme conditions. All these are an indication of a problematic upshift switch circuit thus storing OBD code P2776 in the PCM (powertrain control module) and the check engine light getting on.

OBD code P2776 means Upshift Switch Circuit Low Issue.

Upshift switches are present on vehicles having manually shifting automatic transmissions. The shift, system wiring and connectors, and mode actuator are all part of the switch shifter circuit.

If the resistance or voltage signal from the upshift switch circuit falls outside of the manufacturer’s specification range, the P2776 code gets stored and a Check Engine Light flashes on the dashboard. It may take several failure cycles before the light will be displayed, depending on the specific make and model.

What causes this problem with the Upshift Switch Circuit Low?

• Defective Switch Shifter
• Switch circuit harness is open or shorted
• Switch circuit electrical connection faulty
• Transmission mechanical problems

1. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
2. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration.
3. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues?
4. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P2776 error. Buy new diagnostic tools and equipment for us.
5. Automatic Transmission Switch - Defective switch will lead to inoperative gear upshifts causing severe transmission problems and driving issues. Thus, replace the defective switches now!
6. Shift Lever - Defective shift lever won’t allow proper gear shifts to occur thus leading to erratic gear shifts and hampered transmission parts. Thus, replace it now!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2776 here:

Common Symptoms

• Check Engine Light illuminated (Malfunction indicator lamp)
• Delayed shift or not shifting between gear
• Transmission slipping
• Loss of fuel economy
• Disabled tap shifting
• Transmission may overheat
• Increased fuel consumption
• In some cases, there may be performance problems, such as dying when coming to a stop after driving on the freeway and/or misfire-like symptoms

Want to correct the Trouble Code P2776? Read these points mentioned below:

• Faulty upshift switch replacement
• Repair or replace upshift switch harness which is open or shorted
• Faulty switch circuit, electrical connection repair/replace
• Replace transmission control module

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2776 code to be stored:

• A mechanic will first input an OBD-II code reader into the vehicle's computer in order to read and identify the trouble code.
• Clear the codes and freeze frame the data. Then, test drive the car to confirm the presence of the P2776 code.
• Check for faulty, damaged or broken wiring and connections to the upshift switch and circuit and replace them immediately.
• Next, check for the continuity of the switch circuit by testing the component by removing the power. If a continuity or resistance is found, expect for faulty wiring.
• Any diagnostic findings should be compared with the car manufacturer's default specifications in order to pinpoint abnormalities.
• If there are other trouble codes registered on the OBD-II reader, it may offer additional guidance in finding the root problem.
• Also check for PCM faults and repair, replace and reprogram the Powertrain control module as per requirement.

Common Mistakes When Diagnosing the P2776 Code

Oftentimes the PCM/TCM sensor and circuit is blamed, and replaced, without checking the switch circuit as well as neglecting the damaged wiring and connectors. Because there can be several causes for this code, a complete inspection should be carried out in order to avoid repairs that may be unnecessary and more expensive.