Powertrain, generic (extended)

P23EA Camshaft A Position Signal Output Circuit Low (Bank 2)

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P23EA sets when the ECM's output line that relays the bank 2 camshaft A position signal to another control unit is pulled toward ground. The check is blocked during cranking: the module commands the output high and expects the line to rise; if it stays low, the wire is chafed against ground or the receiver has an internal short. GM's 2019 tables for the bank 1 equivalent P2615 give 0.5 ohm or less to ground, or 200 kOhm and more for an open, sampled every 100 ms, with 40 of 50 samples having to fail, rated Type C without MIL. No manufacturer lists P23EA publicly, so the GM values are an analogy. Depending on the receiver, shift quality or start-stop may suffer while the camshaft sensor itself is fine.

Likely causes

Output wire chafed through to ground on the engine or body
Receiving module with an input shorted to ground
Moisture or dirt bridging terminals in a connector
Output stage in the engine control module failed

Symptoms

  • Code stored, engine running normally
  • Harsher shifts or delayed engagement if the transmission module uses the signal
  • Start-stop function switched off

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

P23E9P23EBP23EDP23F0P2615

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