P2B2E code meaning
Engine Coolant Temperature Sensor 5 Circuit High
Powertrain system Generic code P2Bxx codes Check engine light
What P2B2E means
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.
P2B2E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2B2E
- MIL after two trips
- Sensor 5 reads around −40 °C or lower in live data
- Engine runs on a substitute temperature value
Common causes of P2B2E
- Most likelyOpen signal or ground wire, or unplugged connector
- PossibleChafed engine harness interrupting the circuit
- PossibleOpen sensor 5 element
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine coolant temperature sensor 5Wiring harnessECM
What each part of P2B2E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| B | Area: hybrid propulsion. |
| 2E | The exact fault in that area. |
What to do next
- Note P2B2E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2B2E
What does P2B2E mean?
P2B2E means "Engine Coolant Temperature Sensor 5 Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2B2E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2B2E fail an emissions test?
Yes, it can. P2B2E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2B2E to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2B2E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.