P23EBCamshaft A Position Signal Output Circuit High (Bank 2)
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P23EB is the opposite fault to P23EA: the bank 2 camshaft A output line, which the ECM drives as a switched low-side signal for another module, stays high when it should be pulled low. Typical reasons are a wire touching a supply circuit, moisture in a connector or a defective driver in the ECM. GM checks the bank 1 version P2616 while the output is commanded low and declares a short to power at 0.5 ohm or less, with system voltage at least 11 V and 40 of 50 samples failing (Type C, no MIL). Nothing comparable is published for P23EB itself, so these figures only serve as a guide. Unlike sensor codes such as P0345, the engine's own timing is not affected; the risk lies with the module downstream, which loses its phase reference.
- What you may notice
- Code present without drivability complaint
- Related fault codes in the receiving control module
- Comfort functions such as start-stop deactivated
- Likely causes
- LikelyOutput wire shorted to a battery or 5 V supply wire in the harness
- PossibleWater ingress bridging terminals
- RareECM output transistor no longer switching to ground
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.