Technical Description of OBD-II Trouble Code
The control circuit for Pressure Control Solenoid G is open.
What does that mean?
This is a generic diagnostic trouble code (DTC) for automatic transmission and applies to OBD-II vehicles. This includes vehicles from various manufacturers such as Ford, GMC, Chevrolet, Honda, BMW, Saturn, Land Rover, Acura, Nissan, Saturn, etc. The repair steps may vary depending on the year, make, model, and powertrain configuration.
Most automatic transmissions have at least three pressure control solenoids, labeled as solenoid A, B, and C. Newer transmissions may have additional solenoids like D, E, F, etc. The “G” solenoid control circuit is associated with various trouble codes, including P2812, P2813, P2814, and P2815. When the P2812 code is set, it means that the Powertrain Control Module (PCM) has detected a problem with the transmission pressure control solenoid “G” control circuit. The specific code set depends on the specific malfunction detected by the PCM.
An automatic transmission relies on bands and clutches that change gears by controlling fluid pressure. The purpose of the transmission pressure control solenoids is to adjust the fluid pressure for proper transmission operation and smooth shifting. The PCM monitors the pressure within the solenoids and directs fluid to different hydraulic circuits to change the transmission gear ratio as needed.
Code P2812 is set when the PCM detects an open circuit in the “G” pressure control solenoid control circuit.
Example of transmission solenoids:
What is the severity of this DTC?
This code typically starts as moderate severity but can quickly progress to a more severe level if not addressed promptly. If the transmission bangs into gear, it can cause permanent internal damage, making the problem more severe.
What are some of the symptoms of the code?
Symptoms of a P2812 trouble code may include:
What are some of the common causes of the code?
Possible causes for this P2812 transmission code may include:
What are some P2812 troubleshooting steps?
Prior to troubleshooting, it is recommended to research the Technical Service Bulletins (TSB’s) for the specific vehicle based on year, model, and transmission. This can save time by providing guidance in the right direction.
Fluid & Wiring Inspections
Start by checking the fluid level and examining its condition for contamination. If possible, check the vehicle records to verify when the filter and fluid were last changed.
Next, visually inspect the wiring for any obvious defects. Check the connectors and connections for security, corrosion, and damaged pins. This includes all wiring and connectors related to the transmission pressure control solenoids, transmission pump, and PCM. The transmission pump may be driven electrically or mechanically depending on the specific configuration.
Advanced Steps
The advanced steps are vehicle-specific and require appropriate advanced equipment for accurate performance. These procedures involve using a digital multimeter and specific technical references for the vehicle. Always obtain the specific troubleshooting data for your vehicle before proceeding with the advanced steps. Voltage and fluid pressure requirements may vary based on the specific model and transmission design.
Continuity Checks
Unless specified otherwise by the technical data, normal readings for wiring and connections should show 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 no continuity indicates faulty wiring that is open or shorted and requires repair or replacement.
What are some common repairs for this code?
Possible misdiagnosis may include:
We always recommend seeking professional mechanical service to resolve this issue. However, if that is not possible, we offer the option to permanently delete this specific DTC while keeping all other codes active. If you are interested in this option, please upload your ECU file to our portal.
