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Home / DTC / P0EE8 — Battery Charger Coupler Temperature Sensor B Circuit Range/Performance

P0EE8 — Battery Charger Coupler Temperature Sensor B Circuit Range/Performance

Detailed page for trouble code P0EE8.

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P0EE8

Generic P — Powertrain

Battery Charger Coupler Temperature Sensor B Circuit Range/Performance

Brand: Generic
Type: P — Powertrain
Views: UK: 9 EN: 18 RU: 17
AI status
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Page language: EN

Causes

  • Open or short in temperature sensor wiring
  • Corroded, loose or damaged connector at the sensor or charger coupler
  • Failed temperature sensor (thermistor or sensor element)
  • Poor or missing ground or reference voltage to sensor
  • Water intrusion or contamination at sensor/connector
  • Intermittent connection caused by chafed wiring or connector pins

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning light illuminated
  • Reduced or inhibited charging rate or charger disabled
  • Charge session faults or inability to charge
  • Diagnostic trouble codes related to charger or temperature circuits
  • Possible fault messages about thermal management or coupler temperature

What to check

  • Use a scan tool to read freeze frame and live data for sensor B and related channels
  • Verify vehicle power and high-voltage system is safe and disabled per manufacturer procedures before touching harness/connectors
  • Visually inspect connectors and wiring at battery charger coupler and along harness for damage, corrosion or water entry
  • Backprobe the sensor connector with the sensor connected and measure signal voltage and reference voltage with key/charger in the appropriate state
  • Measure sensor resistance with connector disconnected (compare to expected thermistor values or service data)
  • Confirm good ground continuity from sensor ground to chassis/ECU ground

Signal parameters

  • Reference voltage: typically ~5.0 V (vehicle-specific); verify with service data
  • Signal voltage (expected): commonly ~0.2–4.8 V depending on temperature and vehicle; extremes near 0 V or near reference indicate short/ open
  • Thermistor resistance (typical NTC example): ~10 kΩ at 25 °C (varies by sensor); consult service spec
  • Open-circuit indication: very high resistance (e.g., >100 kΩ) or signal near reference voltage
  • Short-circuit indication: very low resistance (e.g.,
  • Sensor response: resistance should change with temperature (NTC decreases as temp rises)

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data. Note other related codes (charger, HV battery, ground faults).
  2. Follow safety procedures for high-voltage systems. Disable high-voltage/charger power per manufacturer instructions before disconnecting connectors.
  3. Perform a visual inspection of sensor B connector, wiring, and coupler for damage, corrosion, or water ingress. Repair or clean as needed.
  4. With vehicle/charger in the correct state for powering sensor, backprobe the sensor connector: verify reference voltage (often ~5 V) and good ground. If reference or ground missing, trace wiring to source.
  5. With connector disconnected, measure sensor resistance at ambient. Compare to expected value in service data. If resistance is open or short, replace sensor.
  6. If resistance is within spec, warm or cool the sensor (heat gun/ice pack, while observing safe practices) and confirm resistance/voltage changes appropriately. No change indicates a bad sensor or wiring issue.
  7. Perform continuity checks between sensor pins and the charger/module connector to locate opens/shorts. Repair wiring harness as necessary.
  8. After repairs, clear codes and perform a charge cycle or test procedure to verify the sensor reads within range and the code does not return.
  9. If wiring and sensor check OK but code persists, suspect the charger control/module input circuit. Consult module diagnostics and consider module repair/replacement.

Likely causes

  • Sensor B element failed (thermistor open or shorted)
  • Connector on coupler contaminated/corroded or not fully seated
  • Wiring harness chafed where it flexes (short to ground or open)
  • Reference 5V (or module reference) not present at sensor connector
  • Poor ground return at sensor or module

Fault status

⚠️ Status
Battery Charger Coupler Temperature Sensor B Circuit — signal out of expected range/poor performance; may disable or limit charger operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0112 P0113 P0117 P0118 P0A0F P0A1F
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