P2E4C

Code

Generic P — Powertrain

Battery Charger Coupler Temperature Sensor C Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 17 EN: 32 RU: 14

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Short to ground on the sensor signal circuit
Open or internally shorted temperature sensor
Corroded, loose or damaged connector pins at the coupler or ECU
Broken or chafed wiring harness between sensor and control module
Poor or missing reference/ground at the charger coupler or control module
Control module (ECM/PCM/Battery ECU) input fault

Symptoms

DTC P2E4C stored and warning/charge system message may be displayed
Incorrect or frozen charger coupler temperature reading in live data
Charging rate limited or charger disabled (depending on system design)
Intermittent faults related to moisture or movement of connectors

What to check

Read and record freeze frame and live data for the coupler temperature sensor C
Perform a visual inspection of the charger coupler, sensor, connector, and wiring for damage or corrosion
Check for any high-voltage/charger disable messages and follow safe isolation procedures before working
Backprobe the sensor connector and measure signal voltage with key/charger in the state required by manufacturer (refer to service manual)
Measure reference voltage (often 5 V) and ground presence at the sensor connector
Measure continuity between sensor signal and control module pin to check for short to ground or open

Signal parameters

Sensor type: typically thermistor (NTC) or temperature sender; behavior: resistance varies with temperature
Expected signal: analog voltage proportional to temperature (commonly in the 0.5–4.5 V usable range)
Fault condition: 'Low' generally means signal voltage below threshold (often
Reference supply: usually ~5 V or vehicle-specific regulated reference from control module
Resistance check: sensor should show a reasonable resistance for ambient temperature (consult service data for exact ohms vs temperature chart)

Diagnostic algorithm

Safety first: if vehicle is hybrid/EV or charger is high-voltage, disable high-voltage system and follow manufacturer lockout/tagout procedures before touching charger hardware.
Connect a scan tool and confirm P2E4C is current or stored; view live data for Charger Coupler Temp Sensor C while attempting to reproduce.
Visually inspect the coupler sensor, connector, and harness for corrosion, damage, pin push-out or water ingress; repair as needed.
With ignition/charger in the required state, backprobe the sensor connector and measure: reference voltage, signal voltage, and ground continuity. Compare to expected ranges.
If signal voltage is low, disconnect the sensor and measure resistance at the sensor pins. If resistance is very low (near short) or open/infinite, replace the sensor.
Check continuity from the sensor signal pin to the control module input. If continuity to ground exists, locate and repair short in harness (inspect along harness routing for chafe points).
Wiggle or move the harness and connector while monitoring live data to detect intermittent opens/shorts.
If wiring and sensor check good, test or substitute the control module input (if allowed by service procedures) or consult OEM module testing procedures.
After repairs, clear codes, perform a function test and road/charge cycle to confirm the fault does not return.

Likely causes

Short to ground in the sensor signal wiring (most common)
Failed temperature sensor (internally shorted or open)
Connector corrosion or poor mating at the coupler or ECU
Damaged wiring harness from mechanical abrasion or service-related pinch
Faulty control module input (least common)

Fault status

⚠️ Status

P2E4C — Battery Charger Coupler Temperature Sensor C Circuit Low: Sensor signal below minimum threshold detected. Check sensor, wiring, connector, and module input.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours