P07F4 code meaning
Transmission Range Control Module Communication Circuit High
What P07F4 means
The transmission range control module is the separate shift-by-wire control unit that reads the selector and drives the range actuator. P07F4 is the electrical high check of its communication line: the line is shorted to the supply and stays at a high level. No manufacturer document available to us uses it; as with P07F3 it fits a dedicated signal or redundancy line rather than a CAN bus, whose faults GM reports under its own U codes. The module may block range changes or select neutral.
P07F4 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P07F4
- Shift warning
- Possible shift lock or neutral (depends on manufacturer)
Common causes of P07F4
- PossibleCommunication wire shorted to the supply
- Less likelyModule faulty
- Less likelyConnector fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Shift by wire moduleCommunication wiringTransmission control module
What each part of P07F4 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| F4 | The exact fault in that area. |
What to do next
- Note P07F4 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P07F4
What does P07F4 mean?
P07F4 means "Transmission Range Control Module Communication Circuit High". The transmission range control module is the separate shift-by-wire control unit that reads the selector and drives the range actuator. It is a generic code, so it means the same on every make.
Is it safe to drive with P07F4?
Drive gently and only to a workshop. With P07F4 the car can go into limp mode (reduced power) to protect itself.
Will P07F4 fail an emissions test?
P07F4 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P07F4 to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P07F4 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.