P2B76Coolant Heater B Control Circuit/Open
- Generic OBD-II code · Powertrain
- How the car detects it
- P2B76 reports an open command circuit for coolant heater B. Where a vehicle has two separately requested heaters or heating stages – Hyundai and Kia patent US11378000B2 describes one housing with several sheath elements that a controller switches individually – B stands for the second channel. Which physical heater carries the letter is up to the manufacturer, and none documents P2B76 publicly. Typical findings are a terminal pushed out of the connector, a wire broken where the harness flexes near the heater, or a blown feed for the request line. California's OBD rule covers outputs of this kind with a circuit test. Heater A often keeps working, so heating is only weaker; if both fail, look at P2B72 and the communication code U069E too.
- What you may notice
- Reduced heating power, cabin warms more slowly
- Defrosting takes longer in cold weather
- Fault entry often without other noticeable effects
- Likely causes
- LikelyRequest wire for heater B broken at a flex point
- PossibleTerminal pushed out of the heater connector
- RareFuse feeding the request circuit blown
- RareHeater B input open inside the heater electronics
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.