OBD-II code · Powertrain (generic, extended)
P2443 Secondary Air Injection System Switching Valve Stuck Closed (Bank 2)
The switching valve on bank 2 will not open when commanded, so no secondary air reaches the exhaust during cold start. Catalyst light-off is delayed and emissions during the cold-start window rise.
Is it safe to drive with P2443?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySwitching valve stuck closed
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Secondary Air Switching Valve, Secondary Air Vacuum Lines
Related codes
- P2441Secondary Air Injection System Switching Valve Stuck Closed (Bank 1)
- P2440Secondary Air Injection System Switching Valve Stuck Open (Bank 1)
- P2442Secondary Air Injection System Switching Valve Stuck Open (Bank 2)
- P2444Secondary Air Injection System Pump Stuck Off (Bank 1)
- P2445Secondary Air Injection System Pump Stuck On (Bank 1)
- P2446Secondary Air Injection Pump Stuck Off (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.