Transmission range sensor or switch faulty or worn internally; Range sensor out of adjustment or selector linkage or cable misaligned; Damaged, chafed or corroded wiring shorting to earth in the sensor circuit; Poor connection at the sensor plug or control unit connector, such as water ingress or bent pins; Fluid contamination or leakage reaching the sensor or connector inside or on the gearbox; Faulty transmission or powertrain control module.

P0707

Transmission Range Sensor A Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
07: FaultThe specific fault in that area

What it means

P0707 means the powertrain control module or transmission control module has seen a voltage that is too low on the transmission range sensor A circuit. This sensor, also called the gear selector or PRNDL switch, tells the control unit which gear position the driver has chosen. The fault sets when the signal voltage falls below the expected range, which points to a short to earth, an open circuit, a wiring fault or a failed sensor.

Symptoms

Gearbox warning light or check engine light on
Engine will not start, or starts in only some selector positions
Gear indicator on the dash shows the wrong position or goes blank
Harsh, delayed or incorrect gear engagement
Gearbox stuck in one gear (limp mode)
Reversing lights not working or staying on

Possible causes

Transmission range sensor or switch faulty or worn internallylikely
Range sensor out of adjustment or selector linkage or cable misalignedlikely
Damaged, chafed or corroded wiring shorting to earth in the sensor circuitlikely
Poor connection at the sensor plug or control unit connector, such as water ingress or bent pinspossible
Fluid contamination or leakage reaching the sensor or connector inside or on the gearboxpossible
Faulty transmission or powertrain control modulerare

How to diagnose

Read all stored codes and freeze frame data, and note whether other gearbox or start-inhibit codes are present
Check the gear position shown on the dash and in live data against the actual selector position in each gear
Visually inspect the sensor, its wiring and connector for damage, corrosion, moisture or fluid leaks
Check the selector cable or linkage for correct adjustment and secure fixings, following the manufacturer's procedure for that model
Check the gearbox fluid level and condition, as the correct method varies by gearbox type
With the connector unplugged, test the circuit for short to earth, open circuit and resistance against the manufacturer's wiring diagram
Check the sensor's reference voltage, earth and signal values against the specification for that model
Only if the wiring and sensor test fine, check for control unit faults and any applicable software updates

How to fix

Replace the transmission range sensor and set it up as the manufacturer specifies
Adjust the selector linkage or cable and the sensor position to specification
Repair or replace damaged wiring and fix any short to earth
Clean, dry and repair or replace corroded or damaged connectors and terminals
Fix any fluid leak that is affecting the sensor or its connector, then top up or service the fluid as required
Replace or reprogram the control unit only after confirming it is the cause

Can I keep driving?

Medium severity

The car may be driveable but can start unpredictably, shift badly or drop into limp mode, so get it fixed soon. Avoid driving if it will not hold a gear reliably or the gear position is unclear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.