OBD-II code family
Transmission Fluid Pressure Input Faults (30 codes)
30 related fault descriptions. Use each full code and the exact vehicle service information to identify its circuit, monitored condition, and required tests.
Codes in this family
This is the complete published member list for this guide. Each code retains its own page; shared diagnostic context does not mean that every member has the same test or repair.
- P0840Transmission Fluid Pressure Sensor/Switch "A" Circuit
- P0841Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance
- P0842Transmission Fluid Pressure Sensor/Switch "A" Circuit Low
- P0843Transmission Fluid Pressure Sensor/Switch "A" Circuit High
- P0844Transmission Fluid Pressure Sensor/Switch "A" Circuit Intermittent
- P0845Transmission Fluid Pressure Sensor/Switch "B" Circuit
- P0846Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance
- P0847Transmission Fluid Pressure Sensor/Switch "B" Circuit Low
- P0848Transmission Fluid Pressure Sensor/Switch "B" Circuit High
- P0849Transmission Fluid Pressure Sensor/Switch "B" Circuit Intermittent
- P0870Transmission Fluid Pressure Sensor/Switch 'C' Circuit
- P0871Transmission Fluid Pressure Sensor/Switch 'C' Circuit Range/Performance
- P0872Transmission Fluid Pressure Sensor/Switch 'C' Circuit Low
- P0873Transmission Fluid Pressure Sensor/Switch 'C' Circuit High
- P0874Transmission Fluid Pressure Sensor/Switch 'C' Circuit Intermittent
- P0875Transmission Fluid Pressure Sensor/Switch 'D' Circuit
- P0876Transmission Fluid Pressure Sensor/Switch 'D' Circuit Range/Performance
- P0877Transmission Fluid Pressure Sensor/Switch 'D' Circuit Low
- P0878Transmission Fluid Pressure Sensor/Switch 'D' Circuit High
- P0879Transmission Fluid Pressure Sensor/Switch 'D' Circuit Intermittent
- P0987Transmission Fluid Pressure Sensor/Switch "E" Circuit
- P0988Transmission Fluid Pressure Sensor/Switch "E" Circuit Range/Performance
- P0989Transmission Fluid Pressure Sensor/Switch "E" Circuit Low
- P0990Transmission Fluid Pressure Sensor/Switch "E" Circuit High
- P0991Transmission Fluid Pressure Sensor/Switch "E" Circuit Intermittent
- P0992Transmission Fluid Pressure Sensor/Switch "F" Circuit
- P0993Transmission Fluid Pressure Sensor/Switch "F" Circuit Range/Performance
- P0994Transmission Fluid Pressure Sensor/Switch "F" Circuit Low
- P0995Transmission Fluid Pressure Sensor/Switch "F" Circuit High
- P0996Transmission Fluid Pressure Sensor/Switch "F" Circuit Intermittent
What these codes mean
These thirty entries compare transmission-fluid pressure sensor/switch inputs A through F. A is P0840–P0844, B P0845–P0849, C P0870–P0874, D P0875–P0879, E P0987–P0991 and F P0992–P0996. Each group retains five separate reported conditions: circuit, range/performance, low, high and intermittent. The member list preserves every exact code and full title.
The letter identifies the manufacturer’s diagnostic designation. It does not count installed sensors, locate a pressure tap, identify a gear or establish that the input is an analog sensor. Identify the actual vehicle, transmission, reporting controller and complete DTC before using a diagram or interpreting a reading. A pressure switch, pressure sensor and application-specific hydraulic test are different diagnostic subjects even when their generic titles look similar.
A circuit description does not by itself establish an open wire or a failed sensor. In the archived 2012 Jeep Grand Cherokee 5.7L example, P0987 directs a 4C hydraulic-pressure-test path that considers companion faults, switch/circuit information and internal transmission concerns. The archived 2010 Dodge Journey 3.5L P0992 path combines 2/4 and OD hydraulic-switch testing and routes the relevant P0845/P0870 diagnosis. These examples require their own transmission information; neither makes E or F a universal physical part.
Range/performance concerns the expected-versus-observed result under the applicable monitor. It does not certify healthy wiring or select a fluid, valve-body or calibration repair. Mitsubishi’s cited 2019 RE/23C P0988 information evaluates a low-reverse-brake pressure switch’s on/off state. The archived 2012 Durango 5.7L P0988 example names 4C pressure-switch rationality. Keep each expected state and diagnostic path within its actual application rather than applying one pressure location or analog-drift model to the whole group.
Low and high circuit results are different from measurements of low or high hydraulic pressure. The cited advanced-diagnostics procedures for the 2012 Honda Odyssey (P0989/P0990) use the sixth-clutch E pressure switch and compare its low/on or high/off state with the expected operating state; their diagrams also qualify the PCM design. A disconnected voltage, an assumed pull-up, a flat trace or agreement between channels cannot independently select a repair. Use the actual circuit technology, compatible units and specified test conditions.
An intermittent entry retains that condition even if the input looks normal at a later visit. Preserve the full report, status, available event information and symptoms already experienced. Temperature, vibration, recent work or several codes can guide the prescribed investigation, but do not prove a particular connector, board or shared conductor. Do not provoke a rough-road, heat or live-harness event to reproduce it.
Have qualified transmission personnel perform the specified protected circuit and any required pressure-system checks. Do not substitute a generic voltage, jumper, unplug test, coil comparison or gauge rule. Do not use this generic guide to force gear engagement, raise engine speed or load the vehicle to prove an input. Any operating-condition tests belong to a qualified technician following the matched professional procedure with its prescribed equipment and precautions. Follow the vehicle’s warnings and arrange assessment or recovery for unreliable engagement, serious shifting or power problems, overheating or an applicable stop warning.
Ask which exact fault and observed result supports the proposed circuit, switch/sensor, hydraulic or assembly repair, and how the candidate causes were distinguished. Required setup and post-repair verification depend on that repair. Request an itemized vehicle-specific estimate; a code letter, current normal reading or cleared warning does not establish the required parts, price or safe continued driving.
Identify the circuit on your vehicle
Match the full DTC, reporting module, and any failure-type suffix to the service information for your exact year, make, model, engine, and equipment. An identifier alone does not establish installed hardware count, location, connector pinout, or a universal measurement.
Where the manufacturer publishes its own meaning for this code, that is the one to work from — it describes the actual component on your vehicle, which the generic definition cannot. Keep the generic description for what it is good for: it tells you which subject area the standard assigned the code to, which is useful context when the two appear to disagree. If they do disagree, follow the manufacturer.