Powertrain, generic (extended)

P2260 AIR System Control B Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Control wire of circuit B shorted to a battery-voltage feed
Relay or air valve B with an open coil, depending on how the driver is diagnosed
Output stage for circuit B in the engine control module defective

Symptoms

  • 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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–450
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

secondary air pumpsai relaysai wiring

Related codes

P2259P2258P2257P0412P0414

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.