Powertrain, generic (extended)

P23E9 Camshaft A Position Signal Output Circuit/Open (Bank 2)

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P23E9 concerns a signal the engine control module sends out rather than one it receives: on some engines the ECM passes a conditioned copy of the bank 2 camshaft A position signal on to another module that needs engine phase information. The code flags a broken or otherwise faulty output line, typically an open circuit found when the driver stage is switched. No manufacturer documents P23E9 publicly. GM's tables for the bank 1 counterpart on the 2019 2.0 L LTG show the method: the driver voltage is compared with controller limits, and an open line above about 200 kOhm is caught during the low-circuit check, which is why P2614 may set alongside it. Ground faults belong to P23EA, shorts to voltage to P23EB. The engine itself usually keeps running normally.

Likely causes

Broken wire in the output line to the receiving module
Terminal pushed back or corroded in a connector
Receiving module unplugged or without its load resistor
Faulty output driver inside the engine control module

Symptoms

  • Stored code with no noticeable change in engine running
  • Fault entries in the module that receives the camshaft signal
  • Start-stop or shift functions may be restricted

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time0.5–3 h

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

Parts involved

engine control modulecam position signal a b2 outputwiring harness

Related codes

P23EAP23EBP23ECP23EFP2614P0345

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