Powertrain, generic (extended)

P2660 "B" Rocker Arm Actuator Control Circuit/Open (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2660 concerns V-type or boxer engines with switchable rocker arms on both cylinder banks: the controller sees the drive circuit of solenoid B on bank 2, the side without cylinder 1, as broken. An open coil, a disconnected plug after valve cover work, or a cut wire leaves the output without load, so the command and the electrical feedback disagree. No manufacturer documents P2660 publicly, and the Honda V6 cases on record involve bank 1 only. GM's 2015 table 15OBDG05 illustrates the method on actuator A with a driver check from 11 V upward and 100 failures in 120 samples. CARB requires circuit monitoring on every lift system output. The bank 1 equivalent is P2650; shorts on this line are P2663 and P2664.

Likely causes

Solenoid B plug on bank 2 left unplugged or not latched after repairs
Open coil in bank 2 solenoid B
Cut or broken wire on the bank 2 harness branch

Symptoms

  • MIL on
  • Bank 2 B stage inactive, uneven running between banks possible

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–500
Time0.5–3 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

P2663P2664P2661P2650P2655

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.