OBD-II code · Powertrain (generic, extended)
P2C78 Active Grille Air Shutter Module D Over Temperature
The control module of active grille air shutter D reports junction temperature above its protection threshold. Thermal protection has triggered.
Is it safe to drive with P2C78?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyUnder-bonnet temperature too high
- PossibleSustained stall current
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
- Active Grille Shutter D, Wiring Harness, Ecm
Related codes
- P05C0Active Grille Air Shutter Module A Over Temperature
- P05C1Active Grille Air Shutter Module B Over Temperature
- P2C75Active Grille Air Shutter Module C Over Temperature
- P2C76Active Grille Air Shutter D Stuck On
- P2C77Active Grille Air Shutter D Control Circuit Range/Performance
- P2C79NOx Adsorber - Sulfur Limit Exceeded
- P2C7ASCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 2
- P2C7BTurbocharger Turbine Inlet Valve Control Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.