P2260AIR System Control B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2260 flags secondary air control circuit B sitting at too high a level, as with a short to the supply or a driver output that cannot switch. Circuit B drives the second pump, second relay or a separate air valve, depending on the engine. Where the ECM grounds the relay to switch it, a short to power means the relay can never pull in: pump or valve B stays idle, and the catalyst on that side heats up more slowly after a cold start. No manufacturer documents its threshold for circuit B; GM only lists P2260 among the codes in its connector bulletin PIP5094 (2014 and older). For circuit A, GM's 2018 tables treat 0.5 ohm or less between signal and supply, with the driver on, as a Type B fault, which shows the type of check involved. P2259 is the low-level counterpart, P2258 the same fault on circuit A.
- What you may notice
- MIL on
- Second secondary air pump or valve does not operate after a cold start
- Increased cold-start emissions, possibly with a secondary air flow code on one bank
- Likely causes
- LikelyControl wire of circuit B shorted to a battery-voltage feed
- PossibleRelay or air valve B with an open coil, depending on how the driver is diagnosed
- RareOutput stage for circuit B in the engine control module defective
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.