Powertrain, generic (extended)

P2BE3 Hybrid/EV Battery Coolant Level Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2BE3 means the level sensor signal of the battery coolant loop is above its valid range, typically from a short to the sensor supply or to 12 V, or from a lost sensor ground. No manufacturer documents P2BE3 publicly. GM's code P1FFD on the Chevrolet Volt shows the same test with numbers: above 4.0 V, 40 of 50 samples at 100 ms, Type A. GM counts an open circuit as high there, so depending on the pull-up design a broken wire can end up under this code rather than P2BE0. GM bulletin PI0961 lists breaks inside the jumper harness of the sensor among the causes. CARB requires such range checks for hybrid inputs. The low side is P2BE2; the reservoir level should be checked before any part is replaced.

Likely causes

Open sensor ground or open signal with pull-up (read as high)
Signal wire shorted to sensor supply or 12 V
Level sensor output stuck high

Symptoms

  • Hybrid system warning
  • MIL on
  • Charging possibly disabled

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–350
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery coolant level sensorwiring harnessbms

Related codes

P2BE2P2BE0P2BE1

References: gsi.ext.gm.com, law.cornell.edu, static.nhtsa.gov.