Powertrain, generic

P0EBE A/C Refrigerant Temperature Sensor A Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0EBE is logged when the voltage from refrigerant temperature sensor A falls close to zero. For an NTC element a low voltage stands for high temperature, so the controller sees refrigerant that seems far too hot. Real heat at that level is unlikely; a signal wire chafed through to ground or a thermistor shorted internally is the usual finding. No manufacturer publishes P0EBE. GM's 2012 Volt reacts to its evaporator refrigerant sensor below 2 percent of the reference (about 0.1 V) in 40 of 50 samples as P0537, Type B, which shows how such a check is built. Expect the compressor to be held off as protection. High-voltage fault of this sensor: P0EBD.

Likely causes

Signal wire chafed and shorted to ground
Thermistor shorted internally
Moisture bridging the connector pins

Symptoms

  • A/C compressor switched off as a precaution
  • Live data shows an unrealistically hot refrigerant

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–400
Time0.5–2 h

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

Parts involved

ac refrigerant temp sensor ahvac control modulewiring harness

Related codes

P0EBDP0EBCP0EBFP0EC3P0537

References: gsi.ext.gm.com, law.cornell.edu.