Powertrain, generic (extended)

P2664 "B" Rocker Arm Actuator Control Circuit High (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2664 signals excessive voltage on the control line of solenoid B, bank 2. Contact with a powered conductor, for example where several solenoid and injector feeds share a connector, or a driver that can no longer pull the line down, are the typical causes. Depending on how the output is wired, the valve may then be energised all the time, keeping stage B on that bank engaged, or not work at all. No manufacturer publishes P2664 or a threshold for it. GM monitors the corresponding A circuits on its 2015 four-cylinders with a Type A driver test above 11 V, which shows the usual approach. CARB lists shorts to power among circuit faults that lift system outputs must detect. Compare P2663 for a low reading, P2660 for an open and P2654 on bank 1.

Likely causes

Short to a powered feed inside a shared engine connector
Output driver in the control module stuck off
Internally shorted solenoid B on bank 2

Symptoms

  • MIL on
  • Misfire or rough idle on bank 2 if the stage stays engaged

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–650
Time0.5–3.5 h

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

Parts involved

rocker arm actuator b b2oil control valvewiring harness

Related codes

P2660P2663P2654P2659

References: law.cornell.edu, gsi.ext.gm.com.