Modern vehicles are equipped with sophisticated onboard computers that constantly monitor various systems, including the transmission. When a problem is detected, the computer generates a diagnostic trouble code (DTC), commonly known as a transmission error code. These codes provide valuable insights into the nature of the issue, helping technicians diagnose and repair transmission problems effectively.
Understanding some of the common transmission error codes can help you recognize potential problems and seek timely assistance.
P0733: Gear 3 Incorrect Ratio
This code indicates that the transmission isn’t shifting into third gear correctly. Several factors can trigger this code, including:
- Worn Clutch Packs: The clutch packs responsible for engaging third gear may be worn out, preventing proper gear engagement.
- Faulty Shift Solenoids: Shift solenoids control the flow of transmission fluid to engage different gears. A malfunctioning solenoid can disrupt the shifting process.
- Low Transmission Fluid: Insufficient transmission fluid can hinder proper hydraulic pressure and affect gear engagement.
- Internal Transmission Damage: In some cases, the P0733 code may indicate more severe internal damage within the transmission, requiring a thorough inspection.
P0752: Shift Solenoid A Stuck On
This code signifies a problem with the shift solenoid responsible for controlling gear engagement. Possible causes include:
- Defective Shift Solenoid: The solenoid itself may be faulty, failing to function correctly.
- Wiring Issues: Damaged or corroded wiring to the solenoid can disrupt its operation.
- Transmission Control Module (TCM) Problems: The TCM controls the solenoids, and a malfunctioning TCM can lead to solenoid-related issues.
P0614: ECM/TCM Incompatible
This transmission error code suggests a communication problem between the Engine Control Module (ECM) and the Transmission Control Module (TCM). These modules need to communicate effectively for optimal vehicle operation. Potential causes for this code include:
- Software Incompatibility: The software in either the ECM or TCM may be outdated or incompatible, leading to communication errors.
- Wiring Problems: Damaged or corroded wiring between the ECM and TCM can disrupt communication.
- Faulty ECM or TCM: A malfunctioning ECM or TCM can hinder proper communication.
P0700: Transmission Control System Malfunction
This code is a general indicator of a problem within the transmission control system. It serves as a starting point for further diagnosis. To pinpoint the exact issue, a technician will typically need to use a diagnostic scanner to retrieve more specific codes from the TCM. Some possible causes include:
- Sensor Failures: Various sensors within the transmission system, such as speed sensors or range sensors, may be malfunctioning.
- Solenoid Problems: Faulty shift solenoids can disrupt gear engagement and trigger this code.
- Wiring Issues: Problems with the wiring harness connecting the transmission components can lead to communication errors.
P0706: Transmission Range Sensor Circuit Range/Performance
This transmission error code indicates a problem with the transmission range sensor, which tells the TCM the position of the gear selector (Park, Reverse, Neutral, Drive, etc.). This can cause issues with shifting, starting, or even the vehicle’s ability to recognize what gear it’s in. Possible causes include:
- Faulty Range Sensor: The sensor itself may be worn out or damaged.
- Misadjusted Shift Linkage: The shift linkage may be misaligned, preventing the sensor from accurately detecting the gear position.
- Wiring Problems: Damage or corrosion in the sensor’s wiring can disrupt its signal.
Other Transmission Codes
While the codes mentioned above are some of the most common ones we see, the list is far from complete. In fact, there are hundreds of ODB-II error codes that indicate transmission issues. If you see your check engine light come on and suspect a transmission issue, the best solution is to have a qualified technician investigate the issue and interpret the error code.
Trust Your Transmission Repairs to DOT Transmissions
If your transmission is giving you trouble, DOT Transmissions is here to help. Our qualified transmissions can investigate transmission error codes and provide you with practical transmission repair solutions that will have you back on the road in no time.
Contact us today to schedule an appointment for your vehicle—we provide service for all makes and models of domestic, imported, and luxury automobiles.
