OBD-II code · Powertrain (generic)
P07F4 Transmission Range Control Module Communication Circuit High
Range control module communication line reads stuck high — bus shorted to battery voltage or open at the bus terminator.
Is it safe to drive with P07F4?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyBus shorted to battery voltage
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Range Control Module, Communication Bus
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.