Technical Description of OBD-II Trouble Code
The control circuit for Pressure Control Solenoid E is experiencing a low voltage condition.
What does that mean?
This is a generic diagnostic trouble code (DTC) for transmissions in OBD-II vehicles with automatic transmission. This code can apply to various vehicle makes and models including 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 A, B, and C. Newer transmissions may have additional solenoids such as D, E, F, etc. The “E” solenoid control circuit is associated with various trouble codes, including P2727, P2728, P2729, and P2730. When the P2729 code is set, it means that the Powertrain Control Module (PCM) has detected a problem with the transmission pressure control solenoid “E” 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 to ensure 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 P2729 is set when the PCM detects a low voltage condition in the pressure control solenoid “E” control circuit, indicating that it is not functioning properly.
Example of transmission solenoids:
What is the severity of this DTC?
This code typically starts as a moderate issue but can quickly escalate to a more severe problem 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 P2729 trouble code may include:
What are some of the common causes of the code?
Causes for this P2729 transmission code may include:
What are some P2729 troubleshooting steps?
Prior to beginning the troubleshooting process for any malfunction, it is recommended to research the Technical Service Bulletins (TSB’s) for the specific vehicle based on the year, model, and transmission. This can save time by providing guidance in the right direction.
Fluid & Wiring Inspections
The first step is to check the fluid level and inspect the condition of the fluid for contamination. Before changing the fluid, it is advisable to check the vehicle records to determine when the filter and fluid were last 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 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 highly specific to each vehicle and require specialized equipment for accurate performance. These procedures involve using a digital multimeter and referencing the specific technical information for the vehicle. It is important to obtain the specific troubleshooting data for the vehicle before proceeding with the advanced steps. Voltage and fluid pressure requirements may vary based on the vehicle’s model and transmission design.
Continuity Checks
Unless otherwise specified by the technical data, the 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 lack of continuity indicates faulty wiring that is either 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 address 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.
