Technical Description of OBD-II Trouble Code
The performance of the Pressure Control Solenoid G is either not up to par or it is stuck in the off position.
What does that mean?
This is a generic diagnostic trouble code (DTC) for transmission issues and is typically found in OBD-II vehicles with automatic transmissions.
This can apply to various vehicle brands such as BMW, Toyota, Lexus, Nissan, Mitsubishi, Chevrolet, GMC, Mercedes-Benz, etc. However, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.
When the P2808 OBD-II trouble code is triggered, it means that the Powertrain Control Module (PCM) has detected a problem with the Transmission Pressure Control Solenoid “G”. Most automatic transmissions have at least three solenoids (A, B, and C), but this particular DTC involves additional solenoids. The trouble codes associated with the “G” solenoid are P2807, P2808, P2809, P2810, and P2811. The specific malfunction that triggers the code determines which code is set and causes the Check Engine Light to illuminate.
The purpose of the Transmission Pressure Control Solenoids is to regulate the fluid pressure for the proper functioning of an automatic transmission. The PCM receives an electronic signal based on the pressure within the solenoids. An automatic transmission relies on bands and clutches that change gears by having fluid pressure in the correct place at the right time. Based on signals from devices that monitor the vehicle’s speed, the PCM controls the pressure solenoids to direct fluid at the appropriate pressure to different hydraulic circuits, which change the transmission gear ratio at the appropriate time.
The P2808 code is triggered when the Pressure Control Solenoid “G” is not operating correctly or is stuck in the “Off” position.
Example of a transmission pressure control solenoid:
What is the severity of this DTC?
Initially, the severity of this code is moderate, but if not addressed promptly, it can escalate to a more severe level.
What are some of the symptoms of the code?
Symptoms of a P2808 trouble code may include:
What are some of the common causes of the code?
Possible causes for this P2808 transmission code may include:
What are some P2808 troubleshooting steps?
Prior to starting the troubleshooting process for any malfunction, it is recommended to research the Technical Service Bulletins (TSB’s) specific to the vehicle’s year, model, and transmission. This can save a significant amount of time by providing guidance in the right direction. It is also advisable to check the vehicle records to determine when the filter and fluid were last changed, if possible.
Fluid & Wiring Inspections
The first step is to check the fluid level and examine the condition of the fluid for any contamination. Before changing the fluid, it is important to check the vehicle records to verify the last time the filter and fluid were changed.
Next, perform a detailed visual inspection to check the condition of the wiring for any obvious defects. Inspect the connectors and connections for security, corrosion, and damaged pins. This should include all wiring and connectors related to the transmission pressure control solenoids, transmission pump, and PCM. Depending on the configuration, the transmission pump may be electrically or mechanically driven.
Advanced Steps
The advanced steps are highly specific to each vehicle and require the appropriate advanced equipment for accurate performance. These procedures necessitate a digital multimeter and the specific technical references for the vehicle. It is crucial to obtain the specific troubleshooting guidelines for the vehicle before proceeding with the advanced steps. Voltage requirements may vary based on the specific vehicle model. Fluid pressure requirements will also differ based on the transmission design and configuration.
Continuity Checks
Unless otherwise specified by the technical data, the normal readings for wiring and connections should be 0 ohms of resistance. Continuity checks should always be performed with the power removed from the circuit to avoid shorting the circuit and causing further damage. Resistance or lack of continuity indicates faulty wiring that is either open or shorted and must be repaired or replaced.
What are some common repairs for this code?
Possible misdiagnoses may include:
We recommend seeking professional service to address this issue. However, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to be addressed. If you are interested in this option, please upload your ECU file to our portal.
