Wiring fault on the communication circuit, such as a short to voltage, or damaged or chafed insulation; Corroded, loose or pushed-back terminals in the range control module or transmission connector; Low or unstable battery or supply voltage causing incorrect signal levels; Faulty transmission range control module or selector assembly; Fault in the transmission control module or another module on the same network pulling the line high; Outdated or faulty software in a related module, where the manufacturer has documented this for the model.

P07F4

Transmission Range Control Module Communication Circuit High.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
F4: FaultThe specific fault in that area

What it means

P07F4 means the control unit that monitors the transmission range (selector position) saw a communication circuit voltage that was higher than expected, or lost valid messages because of a high-voltage fault on that circuit. This module reports the selected range such as park, reverse, neutral or drive. The exact module layout and circuit type depend on the vehicle, so check the manufacturer wiring information for your model.

Symptoms

Transmission or gearbox warning light on the dashboard
Gear selector position not shown or shown incorrectly on the display
Car will not select drive or reverse, or will not engage park properly
Engine may not start, or starts only in certain selector positions
Transmission stuck in one gear or in a reduced-function (limp) mode
Other warning lights or communication fault codes stored alongside

Possible causes

Wiring fault on the communication circuit, such as a short to voltage, or damaged or chafed insulationlikely
Corroded, loose or pushed-back terminals in the range control module or transmission connectorlikely
Low or unstable battery or supply voltage causing incorrect signal levelspossible
Faulty transmission range control module or selector assemblypossible
Fault in the transmission control module or another module on the same network pulling the line highpossible
Outdated or faulty software in a related module, where the manufacturer has documented this for the modelrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting any other communication or power supply codes
Check battery condition and charging voltage, and rectify any low voltage before further diagnosis
Visually inspect the wiring and connectors at the range control module, selector and transmission for damage, water ingress, corrosion or bent pins
Check the manufacturer's information to identify the circuit type and expected voltage levels for this model
Wiggle-test the harness with a live data view or monitor the code to find intermittent faults
With the circuit disconnected as per the wiring information, test for short to voltage, open circuit and resistance faults
Check the module power and earth supplies and fuses
Check for manufacturer service bulletins or software updates for the range control and transmission modules

How to fix

Repair or replace damaged wiring and fix any short to voltage on the communication circuit
Clean, repair or replace corroded or damaged connectors and terminals
Correct battery or charging system faults that cause low or unstable voltage
Replace the range control module or selector assembly if testing proves it faulty, then perform any required programming or adaptation
Update the module software only if the manufacturer specifies it as a fix for this fault

Can I keep driving?

High severity

Avoid driving if the car will not select gears reliably, will not hold in park or the selector display is wrong, as this is a safety risk. If it drives normally, keep journeys short and get it diagnosed promptly.

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