P2B2EEngine Coolant Temperature Sensor 5 Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2B2E is stored when the fifth coolant sensor shows a resistance so high that only an open circuit, an unplugged connector or a line shorted to voltage can explain it; the NTC curve would put the coolant below −60 °C. GM sets it once the channel exceeds about 298 kΩ in the 2019 L3B tables or about 174 kΩ in the 2025 ECM tables, for 5 s within 6 s, after an engine run time above 10 s or with intake air above −20 °C; Type B, MIL after two trips. As with sensor 4, GM's table names the radiator coolant sensor in this row although the low fault is assigned to sensor 5. GM bulletin 21-NA-149 includes P2B2E among the results of chafed engine harnesses on 2019–2021 light-duty pickups. Supplier NTN-SNR's catalogue has it as an excessive sensor 5 signal. The grounded case is P2B2D.
- What you may notice
- MIL after two trips
- Sensor 5 reads around −40 °C or lower in live data
- Engine runs on a substitute temperature value
- Likely causes
- LikelyOpen signal or ground wire, or unplugged connector
- PossibleChafed engine harness interrupting the circuit
- PossibleOpen sensor 5 element
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.