P23F0Camshaft B Position Signal Output Circuit Low (Bank 2)
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P23F0 is stored when the bank 2 camshaft B output stays at ground potential while the ECM expects it to float high. A low reading can come from insulation damage near the exhaust side, where heat makes harness sleeves brittle, or from a receiving module whose input has failed shorted. Following GM's published logic for P2615, the module samples every 100 ms and sets the fault after 40 bad samples out of 50; an open beyond about 200 kOhm is caught by the same test. These values are borrowed, since no maker publishes P23F0. A dead output leaves the downstream unit without engine phase information, so it may fall back to substitute values, which drivers notice as harsher shifts or disabled features.
- What you may notice
- Code stored, engine itself unaffected
- Harsher shifts or delayed gear changes
- Features such as start-stop disabled
- Likely causes
- LikelyHeat-damaged insulation on the exhaust side grounding the wire
- PossibleReceiving module input failed short to ground
- RareDefective output stage in the ECM
- 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.