P073A
Stuck in Gear 5.
- Generic
- Powertrain
- Generic code
- High severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- 3A
- FaultThe specific fault in that area
What it means
P073A is the generic code for a transmission stuck in 5th gear. The transmission control unit has seen the gear ratio, shaft speeds or shift position feedback show 5th engaged when another gear was commanded, or when 5th should not be available. The way this is detected and the fix depend on the gearbox type (automatic, dual-clutch or automated manual) and vary by model.
Symptoms
- Gearbox stays in 5th and will not shift up or down
- Poor or sluggish pull-away, or the engine struggling or stalling at low speed
- Transmission warning light or gearbox fault message on the dash
- Limp-home mode with reduced performance
- Harsh, delayed or flaring shifts before the fault appears
- Engine speed too low or too high for road speed
Possible causes
- Shift solenoid or actuator sticking, failed or electrically faulty (gear selection or pressure control)likely
- Wiring or connector fault to the transmission, such as chafing, corrosion, water ingress or a poor earthlikely
- Faulty input, output or turbine speed sensor, or gear position sensor giving false feedbacklikely
- Low, degraded or contaminated transmission fluid, or a blocked filter or valve body passages affecting hydraulic controlpossible
- Internal mechanical fault, such as a seized or worn clutch pack, selector fork or synchroniser, or valve body wearpossible
- Transmission control unit or mechatronic unit fault, or outdated software where the manufacturer has a known fix for the modelrare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting road speed, engine speed, commanded gear and fluid temperature when the code set
- Check for other transmission, speed sensor, CAN communication or engine codes and deal with those first
- Check the transmission fluid level, condition and smell, following the manufacturer's procedure for that gearbox, and note any metal debris or burnt smell
- Inspect the transmission wiring harness and connectors for damage, corrosion, fluid contamination or loose pins, and check the battery voltage and earths
- Compare live data for input and output shaft speeds, commanded gear and actual gear ratio during a safe road test to spot a sensor or slip fault
- Test the resistance and operation of the relevant solenoids and speed sensors against the manufacturer's specifications
- Check for any published software updates or technical bulletins for the model and gearbox
- If the electrical and fluid checks pass, inspect the valve body or mechatronic unit and gearbox internals as the manufacturer's procedure directs
How to fix
- Repair or replace damaged wiring, connectors or earths to the transmission
- Replace a faulty speed sensor, position sensor or shift solenoid or actuator
- Correct the fluid level, or service the fluid and filter using the specified type, where it is degraded or contaminated
- Clean, repair or replace the valve body or mechatronic unit if it is sticking or worn
- Repair or replace internal gearbox components (clutches, selector forks, synchronisers) if there is mechanical damage
- Update the transmission control unit software only where the manufacturer lists an outdated calibration as a known cause, or replace a faulty unit
Can I keep driving?
High severity
Limit driving. A gearbox stuck in 5th can overheat or damage the clutches when pulling away and may stall in traffic, so only drive it a short way, gently, to a safe place or workshop, or have it recovered.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.