Cause
Corroded transmission connector
The transmission's main connector sits low on the vehicle, is heat-cycled by the gearbox and is a well-known water trap. Corrosion here produces solenoid and sensor codes in groups, because one plug carries most of them.
Several transmission codes arriving together point at that connector far more often than at several failed parts inside the gearbox.
Typically a moderate job.
Codes this can cause (148)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0702 Transmission Control System Electrical Likely for this code High
- P0708 Transmission Range Sensor A Circuit High Likely for this code Moderate
- P0709 Transmission Range Sensor A Circuit Intermittent Likely for this code Moderate
- P0710 Transmission Fluid Temperature Sensor A Circuit Likely for this code Moderate
- P0713 Transmission Fluid Temperature Sensor A Circuit High Likely for this code Moderate
- P0714 Transmission Fluid Temperature Sensor A Circuit Intermittent Likely for this code Moderate
- P0715 Input/Turbine Shaft Speed Sensor A Circuit Likely for this code High
- P0718 Input/Turbine Shaft Speed Sensor A Circuit Intermittent Likely for this code High
- P0720 Output Shaft Speed Sensor Circuit Likely for this code High
- P0723 Output Shaft Speed Sensor Circuit Intermittent Likely for this code High
- P0791 Intermediate Shaft Speed Sensor A Circuit Likely for this code High
- P0794 Intermediate Shaft Speed Sensor A Circuit Intermittent Likely for this code High
- P0805 Clutch Position Sensor A Circuit Likely for this code High
- P0808 Clutch Position Sensor A Circuit High Likely for this code High
- P0809 Clutch Position Sensor A Circuit Intermittent Likely for this code High
- P0843 Transmission Fluid Pressure Sensor/Switch A Circuit High Likely for this code High
- P0844 Transmission Fluid Pressure Sensor/Switch A Circuit Intermittent Likely for this code High
- P0848 Transmission Fluid Pressure Sensor/Switch B Circuit High Likely for this code High
- P0849 Transmission Fluid Pressure Sensor/Switch B Circuit Intermittent Likely for this code High
- P0863 Transmission Control Module Communication Circuit Likely for this code High
- P0864 Transmission Control Module Communication Circuit Range/Performance Likely for this code High
- P0866 Transmission Control Module Communication Circuit High Likely for this code High
- P0873 Transmission Fluid Pressure Sensor/Switch C Circuit High Likely for this code High
- P0874 Transmission Fluid Pressure Sensor/Switch C Circuit Intermittent Likely for this code High
- P0878 Transmission Fluid Pressure Sensor/Switch D Circuit High Likely for this code High
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Others who found this
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about Corroded transmission connector.