OBD-II code · Powertrain (generic)
P07FF Cold Start Transmission Performance
During the cold-start phase the transmission does not behave to specification — typically very slow shifts, missed shifts or harsh engagement at low ATF temperature. Common causes are degraded ATF (lost cold-flow viscosity), a stuck thermostat or aged solenoid drivers.
Is it safe to drive with P07FF?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDegraded ATF without cold-flow reserve
- PossibleStuck transmission fluid thermostat
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
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Transmission Fluid, Transmission Fluid Thermostat
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.