Guide To P2775 OBD Error Code Solutions

OBD code P2775 gets stored in the powertrain control module (PCM) if the upshift switch performance is out of range or specification. This can cause erratic upshifts and delayed transmission responses.

This feature is available in many automatic transmission vehicles, where the driver gets added control over the gear shifts. This way the driver can get the experience of manual transmission with the smooth drive experience of an automatic. The driver can choose to upshift or downshift as per the increasing or decreasing RPMs. Thus, if there is any problem in the upshift switch circuit range and performance, OBD code P2775 gets stored in the system.

What causes this problem with the Upshift Switch Circuit Range/Performance?

• Upshift switch faulty
• Upshift switch circuit poor connections
• Short or open in the circuit wiring and harness
• Transmission control module faults

1. Engine Control Module - The solenoid might cause a short in the engine control module because of corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
2. Electronic Control Unit - The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.
3. Powertrain Control Module - A trouble with the PCM would mean that it is unable to determine the right fuel mixture and would send the car engine either more or less fuel than it requires. Now when the engine gets more, the carbon emission would increase and fuel economy would drop. In case of the opposite, the engine will choke, stutter, and might start stalling sometimes.
4. Diagnostic Tool - Usually any OBD code problem requires deep insight into the problem and high grade tools in order to fix it properly. Thus, buy quality diagnostic tools form us!
5. 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.
6. Automatic Transmission Switch - Faulty transmission switch can cause upshifting problems and thus will lead to erratic gear shifts and stalling. Thus, replace it now!
7. Shift Lever - Faulty shift lever will cause delayed transmission shifts and gear slippage. In extreme cases the gear may not shift at all. Thus, replace faulty shift lever now!

It is essential 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 P2775 here:

Common Symptoms

• Improper upshifting
• Check engine light on
• Transmission slipping
• Engine stalling and lack of engine response

Here are some ways with the help of which you will be able to correct the OBD Code P2775.

• Upshift switch replacement
• Upshift lever replacement
• Faulty wiring and connector replacement
• Transmission control module replacement
• Powertrain control module replacement

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Here are some steps which you should follow in order to diagnose this P2775 fault code:

• You will need a digital volt ohm meter (DVOM) for the complete test. Also make use of a basic OBD code scanner to reset the computer and erase the code.
• Begin by checking the switch circuit related wiring and connectors. Visually inspect the transmission itself for damage. Inspect the vehicle housing for signs of cracks or damage. If there are any cracks that may or may not be leaking, the transmission should be replaced. Replace any damaged seals. Look for the speed sensors on the transmission and inspect sensors and connectors for signs of damage. If any damage present, repair or replace.
• If there are any faults in the upshift circuit wiring and harness, replace the damaged, broken or corroded wiring immediately. Check for broken connector pins that might be affecting input and output voltage to the circuit and replace the faulty connectors.
• Check for faults in the upshift switch circuit. Using a multimeter, you will need to test resistance values within the switch circuit. If values aren’t within specifications, replace the switch, mend the circuit faults and clear codes.
• Identify wires involved in switch circuits. Using multimeter check for continuity, shorts and open in the wires involved. Also make sure that battery is disconnected before testing and it will also include the ECM. Repair any problems in the circuit and clear codes.
• Test the TCM by back probing the connector and measuring electrical values to ensure it is functioning as it should.

Common Mistakes When Diagnosing the P2775 Code

When diagnosing a P2775 code the most common misdiagnosis would be to have the upshift switch replaced assuming that internal damage has occurred. It is important to note that the circuit is faulty before replacing it. It is best to make sure the switch circuit actually needs to be replaced before adding even more to the cost of repairs.