Cause
Worn valve body
The hydraulic control block inside a transmission, where wear in the bores lets pressure bleed past the valves. Wear shows as pressure faults and harsh or slipping changes that come and go with temperature, because clearances open up as the fluid thins.
Frequently repairable rather than replaceable, which is worth asking about before agreeing to a whole unit.
Typically specialist work. Needs equipment or training most home workshops do not have.
Some of these codes mean you should stop driving
9 of the 178 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (178)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0729 Gear 6 Incorrect Ratio Likely for this code High
- P0730 Incorrect Gear Ratio Likely for this code High
- P0732 Gear 2 Incorrect Ratio Likely for this code High
- P0741 Torque Converter Clutch Circuit Performance/Stuck Off Likely for this code Moderate
- P0744 Torque Converter Clutch Circuit Intermittent Likely for this code Moderate
- P0749 Pressure Control Solenoid A Intermittent Likely for this code High
- P0779 Pressure Control Solenoid B Intermittent Likely for this code High
- P0799 Pressure Control Solenoid C Intermittent Likely for this code High
- P0841 Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance Likely for this code High
- P0845 Transmission Fluid Pressure Sensor/Switch B Circuit Likely for this code High
- P0846 Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance Likely for this code High
- P0867 Transmission Fluid Pressure Likely for this code High
- P0868 Transmission Fluid Pressure Low Likely for this code Stop driving High
- P0870 Transmission Fluid Pressure Sensor/Switch C Circuit Likely for this code High
- P0871 Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance Likely for this code High
- P0875 Transmission Fluid Pressure Sensor/Switch D Circuit Likely for this code High
- P0876 Transmission Fluid Pressure Sensor/Switch D Circuit Range/Performance Likely for this code High
- P0894 Transmission Component Slipping Likely for this code Stop driving High
- P0896 Shift Time Too Long Likely for this code High
- P0987 Transmission Fluid Pressure Sensor/Switch E Circuit Likely for this code High
- P0988 Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance Likely for this code High
- P0992 Transmission Fluid Pressure Sensor/Switch F Circuit Likely for this code High
- P0993 Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance Likely for this code High
- P2700 Transmission Friction Element A Apply Time Range/Performance Likely for this code High
- P2701 Transmission Friction Element B Apply Time Range/Performance 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.
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