Powertrain, generic (extended)

P2659 "A" Rocker Arm Actuator Control Circuit High (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2659 covers the bank 2 control circuit of actuator A reading high: the wire is shorted to a voltage source or the controller's driver stage no longer switches it to ground. No manufacturer documents P2659 publicly. On bank 1, GM's 2015 table 15OBDG05 checks this as P2649 only while the driver is commanded on, again with 100 failures out of 120 samples and a Type A fault. A short of this kind may keep the solenoid powered, so the rocker arms of bank 2 could stay switched; alternatively the controller cuts the output. Compare with P2658 for the low side and P2655 for an open circuit; measuring the voltage at the unplugged connector separates harness from controller faults.

Likely causes

Bank 2 control wire shorted to a voltage source
Controller output stage no longer switching to ground
Neighbouring pins bridged in the connector

Symptoms

  • MIL on immediately
  • Bank 2 lift stays switched or switching is disabled
  • Rough idle in some cases

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–650
Time0.5–2.5 h

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

Parts involved

rocker arm actuator a b2oil control valvewiring harness

Related codes

P2655P2658P2649P2664

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