Powertrain, generic (extended)

P2658 "A" Rocker Arm Actuator Control Circuit Low (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2658 flags the bank 2 control line of rocker arm actuator A as too low, the classic sign of a short to ground or a coil with damaged windings. The test is purely electrical and runs whenever the controller drives the output, regardless of oil condition. No manufacturer documents P2658 publicly; GM's equivalent for bank 1 (P2648 in 15OBDG05) needs more than 11 V and 100 failures out of 120 samples, Type A. Inspect the bank 2 solenoid connector, harness clips near the exhaust manifold and the coil resistance. If only one bank can switch, the controller may disable the feature altogether, leaving reduced power or economy.

Likely causes

Bank 2 control wire shorted to ground
Damaged winding in the bank 2 solenoid
Harness insulation damaged by exhaust heat

Symptoms

  • MIL on immediately
  • Lift switching disabled
  • Less power or higher consumption

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–450
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

P2655P2659P2648P2663

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