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B16E21B — Igniter for deactivation of A/C system 1, Resistance too high
Igniter for deactivation of A/C system 1, Resistance too high. The Taycan, 911 (992), Panamera (971), Panamera (972) and Cayenne report this code; below is which control unit sets it on each model and how to read and clear it.
Which models and control units set B16E21B
How to read and clear B16E21B
- Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
- Open STEUER14, pick your car and run a fault scan: every control unit is read, and B16E21B shows with its status, its full description and the freeze frame when the unit stores one.
- Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.
More about fault memory in the manual →
Download STEUER14 — free fault readingOther codes of the Airbag
| B16D81B | Ignition module lid lock on front passengerʼs side - resistance too high |
| B16E200 | Igniter for deactivation of A/C system 1 |
| B16E201 | Igniter for deactivation of A/C system 1, Electrical malfunction |
| B16E211 | Igniter for deactivation of A/C system 1, Short circuit to Ground (GND) |
| B16E212 | Igniter for deactivation of A/C system 1, Short circuit to B+ |
| B16E21A | Igniter for deactivation of A/C system 1, Resistance too low |
| B16E253 | Igniter for deactivation of A/C system 1, deactivated |
| B16E300 | Igniter for deactivation of A/C system 2 |
| B16E301 | Igniter for deactivation of A/C system 2, Electrical malfunction |
| B16E311 | Igniter for deactivation of A/C system 2, Short circuit to Ground (GND) |
| B16E312 | Igniter for deactivation of A/C system 2, Short circuit to B+ |
| B16E31A | Igniter for deactivation of A/C system 2, Resistance too low |
All 723 codes of this control unit →
Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.