A loose, corroded, or damaged electrical connector at the A/C compressor motor voltage sensor B.; Chafed, pinched, or open wiring in the sensor B circuit, often near the compressor or along the harness.; A failing A/C compressor motor voltage sensor B itself, producing an erratic output.; Poor ground connection for the A/C compressor motor or sensor circuit.; Internal fault in the A/C compressor motor (e.g., worn brushes or intermittent short) affecting the voltage signal.; A faulty powertrain control module (PCM) or A/C control module, though this is less common.; Electrical interference from other components sharing the same circuit or ground.

DTC codes / P0Exx · Hybrid propulsion / P0EAE

P0EAEA/C Compressor Motor Voltage Sensor B Circuit Intermittent/Erratic

P0EAE indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal from the A/C compressor motor voltage sensor B circuit. This sensor monitors the voltage supplied to the electric A/C compressor motor, and the PCM sets the code when the signal momentarily drops out, spikes, or becomes inconsistent beyond a calibrated threshold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

The air conditioning may blow warm air intermittently or stop cooling altogether.
The A/C compressor may fail to engage or may cycle on and off rapidly.
A warning light (check engine or A/C system light) illuminates on the dashboard.
Often no symptoms besides the warning light, especially if the fault is brief and the system still cools.
The blower motor may continue to run, but the air is not chilled.
In some vehicles, the engine cooling fans may run continuously or the idle speed may fluctuate when the A/C is requested.

Common causes, most likely first

A loose, corroded, or damaged electrical connector at the A/C compressor motor voltage sensor B.
Chafed, pinched, or open wiring in the sensor B circuit, often near the compressor or along the harness.
A failing A/C compressor motor voltage sensor B itself, producing an erratic output.
Poor ground connection for the A/C compressor motor or sensor circuit.
Internal fault in the A/C compressor motor (e.g., worn brushes or intermittent short) affecting the voltage signal.
A faulty powertrain control module (PCM) or A/C control module, though this is less common.
Electrical interference from other components sharing the same circuit or ground.

How to diagnose and fix it

Perform a visual inspection of the A/C compressor motor voltage sensor B connector and wiring for looseness, corrosion, or damage.
Check for technical service bulletins (TSBs) or known issues for the specific vehicle make and model related to this code.
Use a scan tool to monitor the sensor B voltage signal in real time while wiggling the harness and connectors to identify intermittent faults.
Measure the sensor B circuit voltage with a digital multimeter and compare to the manufacturer's specification; check for drops or spikes.
Test the sensor B resistance and output signal according to the service manual, and replace the sensor if it is out of specification.
Inspect and clean all ground connections associated with the A/C compressor motor and sensor circuit.
If the sensor and wiring are good, diagnose the A/C compressor motor and control module as per the manufacturer's diagnostic flow chart.

Intermittent A/C Voltage Sensor Faults

A common oversight is assuming the sensor itself is faulty when the real problem is a loose ground or a chafed wire that only acts up under vibration or temperature changes.
The code can be set by a momentary voltage spike from the compressor motor during engagement, which may not affect cooling performance and can be a false alarm if the circuit checks out.
Some vehicles use the same voltage sensor signal for both compressor control and system protection; an erratic signal can cause the PCM to disable the A/C for self-preservation, leading to no cooling even if the sensor is only intermittently bad.
A failing A/C compressor motor can draw excessive current and create voltage fluctuations that the sensor B circuit picks up, so always check the motor's current draw and mechanical condition.
After any repair, clear the code and perform a road test with the A/C on max to verify the signal remains stable under all operating conditions.

Can I keep driving with P0EAE?

You can generally continue driving with this code because it primarily affects the air conditioning system and does not compromise engine safety or drivability. However, avoid long trips in hot weather if cooling is inconsistent, and have the fault diagnosed promptly to prevent potential compressor damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.