P2B23Hybrid/EV Electronics Coolant Temperature Sensor B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P2B23 the signal of electronics coolant sensor B climbs close to the reference voltage. For an NTC sensor that reads as extreme cold, which in practice nearly always points to an interruption: an unplugged or water-damaged connector, a broken signal or ground lead, an open element, or more rarely a short to a voltage source. No manufacturer documents P2B23 publicly; NTN-SNR records it as signal too high for sensor B. GM's tables for the sibling sensor A code P0CF1 set above 98 % of the reference (4.9 V) for 4 s in a 5 s window, Type B with MIL after two trips. A real-world hint comes from sensor A on the Chrysler Pacifica Hybrid, where water in an inline connector caused the same kind of high reading. The grounded counterpart is P2B22.
- What you may notice
- Hybrid or EV system warning with MIL
- Coolant temperature for sensor B shown at about −40 °C in live data
- Power reduced as a precaution
- Likely causes
- LikelyOpen signal or ground wire, or connector not fully seated
- PossibleWater intrusion and corroded pins in a connector of the sensor circuit
- PossibleSensor B element open
- RareSignal wire shorted to a voltage source
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.