Powertrain, generic (extended)

P2663 "B" Rocker Arm Actuator Control Circuit Low (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2663 is stored when the control line to solenoid B on bank 2 reads too low, most often a short to ground somewhere between the module and the second cylinder head. On V engines that harness branch often runs along the back of the block or under the intake manifold, where heat and vibration wear through insulation. A coil whose resistance has collapsed gives the same picture. No carmaker documents P2663 publicly with thresholds. The principle can be seen in GM's 15OBDG05 table for 2015 four-cylinders on the matching actuator A circuit, with 100 failures in 120 samples above 11 V triggering a Type A fault. CARB counts circuit shorts among the faults to be caught. Many drivers switch off for protection, leaving stage B on that bank idle. Bank 1 equivalent: P2653.

Likely causes

Bank 2 control wire worn through and touching ground
Bank 2 solenoid B coil with collapsed resistance
Faulty output driver for bank 2 solenoid B

Symptoms

  • MIL on
  • Stage B on bank 2 out of action, power or economy reduced

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–550
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

P2660P2664P2653P2658

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