P07DE
Incorrect Shift from Gear 3.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- DE
- FaultThe specific fault in that area
What it means
P07DE is the generic code for an incorrect shift from gear 3. The transmission control unit commanded a shift out of third, but the gear ratio calculated from the input and output speed sensors did not match what it expected. The ratio may show slip, a flare, or the wrong gear engaged. The cause depends on the transmission type (conventional automatic, dual clutch or automated manual) and on the model.
Symptoms
- Gearbox warning light or engine management light on
- Harsh, delayed or flared shift when changing out of third
- Engine revs rising without matching road speed (slipping) on a gear change
- Transmission in limp-home mode, often fixed in one gear
- Jerking or shuddering under load in or around third gear
- Gear selection that feels wrong or fails to engage
Possible causes
- Low, degraded or contaminated transmission fluid, or the wrong fluid specificationlikely
- Worn or slipping clutch pack or shift element involved in third gear or the next gearlikely
- Faulty shift solenoid, pressure control solenoid or sticking valve body or mechatronic unitlikely
- Faulty or erratic input or output speed sensor giving an implausible ratiopossible
- Damaged wiring, poor connector contact or corrosion in the transmission harnesspossible
- Outdated transmission control unit software where the manufacturer has a known fix, or a faulty control unitrare
- Internal mechanical damage such as a worn selector fork, synchroniser or gear set (more relevant to dual clutch and automated manual units)rare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting gear, road speed, engine speed, fluid temperature and load when the fault set
- Check for related codes such as speed sensor, solenoid, ratio or communication faults, and deal with those first
- Check the transmission fluid level, condition and smell, following the manufacturer's procedure for the model (some units are sealed and need a specific temperature check)
- Inspect the transmission wiring, connectors and speed sensors for damage, leaks, fluid ingress and corrosion
- Use live data to compare input and output speed and the commanded gear against the actual ratio during a road test
- Test solenoid and sensor circuits for resistance, supply and signal against the manufacturer's specification
- Check for any published software updates or technical bulletins for this model and transmission
- If the above find nothing, carry out pressure tests or a transmission teardown inspection as the model's procedure directs
How to fix
- Correct the fluid level, or replace degraded fluid and filter with the specified type where the design allows
- Repair or replace damaged wiring, connectors or terminals in the transmission harness
- Replace a faulty speed sensor, shift solenoid or valve body or mechatronic unit
- Repair or overhaul the transmission to replace worn clutches, shift elements or selector components
- Apply a manufacturer-released transmission software update where an outdated calibration is a known cause, or replace a faulty control unit
Can I keep driving?
Short, gentle journeys are usually possible, but get it checked soon because slipping can quickly damage the gearbox. If it slips badly, shifts harshly or is stuck in limp mode, limit driving and avoid heavy loads or towing.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.