Your vehicle’s transmission is one of the most complex systems under the hood—and when something goes wrong, your dashboard’s warning lights can quickly become overwhelming. Many issues trigger OBD-II transmission trouble codes, which help pinpoint problems in solenoids, sensors, pressure systems, or the transmission control module (TCM).
Below is a clear breakdown of the most common transmission-related codes and what they typically indicate.
📘 Common Transmission Trouble Codes (OBD-II)
⚙️ Solenoid & Pressure Control Codes
These codes typically point to issues with shift solenoids, which regulate fluid flow and shifting.
- P0700 – Transmission Control System Malfunction
- P0750 – Shift Solenoid A Malfunction
- P0751 – Shift Solenoid A Performance / Stuck Off
- P0752 – Shift Solenoid A Stuck On
- P0753 – Shift Solenoid A Electrical
- P0755 – Shift Solenoid B Malfunction
- P0756 – Shift Solenoid B Performance / Stuck Off
- P0757 – Shift Solenoid B Stuck On
- P0758 – Shift Solenoid B Electrical
- P0760 – Shift Solenoid C Malfunction
- P0761 – Shift Solenoid C Performance / Stuck Off
- P0762 – Shift Solenoid C Stuck On
- P0763 – Shift Solenoid C Electrical
- P0770 – Shift Solenoid E Malfunction
- P0795 – Pressure Control Solenoid C
- P0796 – Pressure Control Solenoid C Performance / Stuck Off
- P0797 – Pressure Control Solenoid C Stuck On
What this usually means:
Electrical faults, stuck valves, or internal hydraulic problems causing shifting issues.
🛢️ Pressure & Fluid Issues
These codes relate to temperature sensors or pressure readings within the transmission.
- P0710 – Transmission Fluid Temperature Sensor Circuit
- P0711 – Transmission Fluid Temperature Sensor Range/Performance
- P0712 – Transmission Fluid Temperature Sensor Low Input
- P0713 – Transmission Fluid Temperature Sensor High Input
- P0868 – Transmission Fluid Pressure Low
- P0871 – Transmission Fluid Pressure Sensor/Switch C Range/Performance
- P0872 – Transmission Fluid Pressure Sensor/Switch C Low
What this usually means:
Low or degraded fluid, overheating, pressure loss, or a failing sensor.
🔧 Gear Ratio & Shift Performance Codes
These codes often indicate significant internal wear or slipping.
- P0730 – Incorrect Gear Ratio
- P0731 – Gear 1 Incorrect Ratio
- P0732 – Gear 2 Incorrect Ratio
- P0733 – Gear 3 Incorrect Ratio
- P0734 – Gear 4 Incorrect Ratio
- P0735 – Gear 5 Incorrect Ratio
- P0736 – Reverse Incorrect Ratio
- P0780 – Shift Malfunction
What this usually means:
Worn clutches, slipping gears, internal mechanical failure, or pressure loss.
📡 Sensor Codes (Input, Output, and Engine Speed)
Speed sensors help the transmission determine proper shift timing.
- P0715 – Input/Turbine Speed Sensor Circuit
- P0716 – Input/Turbine Speed Sensor Range/Performance
- P0717 – Input/Turbine Speed Sensor No Signal
- P0720 – Output Speed Sensor Circuit
- P0721 – Output Speed Sensor Range/Performance
- P0722 – Output Speed Sensor No Signal
- P0725 – Engine Speed Input Circuit
What this usually means:
Failed sensors or damaged wiring resulting in harsh or unpredictable shifting.
🔋 TCM (Transmission Control Module) Codes
The TCM manages all shifting commands.
- P0605 – TCM ROM Error
- P0613 – TCM Processor Fault
- P0705 – Transmission Range Sensor (PRNDL) Circuit
- P0706 – Transmission Range Sensor Range/Performance
What this usually means:
A failing TCM, corrupted data, or a faulty PRNDL sensor preventing proper gear selection.
🔄 Torque Converter & Clutch Codes
Issues here affect engagement and fuel efficiency.
- P0740 – Torque Converter Clutch Circuit Malfunction
- P0741 – Torque Converter Clutch Performance / Stuck Off
- P0742 – Torque Converter Clutch Stuck On
- P0743 – TCC Solenoid Circuit
- P0744 – TCC Intermittent
What this usually means:
A malfunctioning torque converter clutch causing slipping, overheating, or poor fuel economy.
🚨 General Transmission System Warning Codes
These codes indicate broad system problems.
- P0701 – Transmission Control System Range/Performance
- P0702 – Transmission Control System Electrical
- P0791 – Intermediate Shaft Speed Sensor A Circuit
- P0792 – Intermediate Shaft Speed Sensor Range/Performance
What this usually means:
Electrical issues, internal failures, or failing sensors affecting overall transmission operation.
When to Replace Your Transmission
If multiple codes appear—or the same one returns frequently—your transmission may be experiencing internal damage. In many cases, a remanufactured transmission is the most cost-effective solution.
At Gearhead Engines, all remanufactured transmissions are:
✔ Built to OEM specifications
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📞 1-800-508-5999
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