Powertrain, generic (extended)

P23EE Camshaft B Position Signal Output Circuit High (Bank 1)

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P23EE flags a camshaft B, bank 1 output line that the ECM cannot pull low: the voltage stays near supply level, pointing to a short to a battery-fed or 5 V wire, a faulty pull-up in the receiving unit or a failed ECM driver transistor. GM documents the test only for the bank 1 camshaft A counterpart P2616 on the 2019 LTG: monitored while the output is commanded low, a short once resistance to power drops to 0.5 ohm or below, a sample every 100 ms, 40 bad results in 50, Type C. No public manufacturer data exist for P23EE. A driver stage exposed to a hard short can overheat, so locating the short before replacing a module matters. Siblings: open circuit P23EC, low P23ED, the bank 2 high fault P23F1.

Likely causes

Output line shorted to a battery or sensor supply wire
Faulty pull-up circuit in the receiving module
ECM driver transistor burnt out

Symptoms

  • Code logged while the engine runs normally
  • Faults or reduced functions in the module fed by the signal

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 b b1 outputwiring harness

Related codes

P23ECP23EDP23EBP23F1P2616

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