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Home / DTC / P2AC8 — Charge Air Cooler Coolant Temperature Sensor B Circuit Range/Performance

P2AC8 — Charge Air Cooler Coolant Temperature Sensor B Circuit Range/Performance

Detailed page for trouble code P2AC8.

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P2AC8

Generic P — Powertrain

Charge Air Cooler Coolant Temperature Sensor B Circuit Range/Performance

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 20 RU: 11
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Page language: EN

Causes

  • Faulty charge air cooler coolant temperature sensor (Sensor B)
  • Open or short in sensor harness or connector
  • Corroded, loose or water-intruded connector
  • Short to power or short to ground in the sensor circuit
  • Incorrect sensor installed or wrong resistance/characteristic
  • PCM/input module internal fault or poor ground

Symptoms

  • Engine fault/SES lamp illuminated
  • Reduced engine power or limp‑in mode on some vehicles
  • Incorrect turbo boost control or boost limiter activation
  • Poor cold‑start behavior or abnormal warm‑up behavior of charge air cooling system
  • Possible reduced fuel economy or drivability issues

What to check

  • Retrieve freeze frame and live data for CAC coolant temp sensor B and related temps (engine coolant, intake air)
  • Check for additional related DTCs (sensor A codes, PCM communication, power/ground faults)
  • Visual inspection: wiring harness and connector at CAC sensor B for damage, corrosion, loose pins, coolant residue
  • Backprobe sensor connector and measure signal voltage with key ON / engine running using a scan tool
  • Measure sensor resistance at ambient temperature and compare to manufacturer specification
  • Check for continuity and shorts between sensor signal, sensor ground and vehicle power

Signal parameters

  • Typical thermistor behavior (NTC): resistance decreases as temperature rises
  • Open circuit: infinite resistance / no signal; Short to ground: near 0 Ω or signal ≈ 0.1 V; Short to power: signal near battery voltage (~12 V)
  • Typical voltage signal range: approximately 0.1–4.9 V depending on temperature and vehicle application (verify with OEM spec)
  • Example resistance (typical NTC values for reference only): ~2–4 kΩ at 20–25 °C, ~200–500 Ω at 80–90 °C (confirm with vehicle-specific spec sheet)

Diagnostic algorithm

  1. Read and record freeze frame data and pending/all stored codes; note related CAC and engine coolant temp sensors.
  2. Visually inspect sensor B connector and harness for damage, corrosion, or coolant evidence. Repair/replace damaged connectors or harness sections as needed.
  3. With ignition ON (engine off), backprobe the sensor signal wire and measure voltage; compare to expected idle/ambient values. Look for shorts to power (≈ battery voltage) or ground (≈0.1 V).
  4. With engine at known temperature, measure sensor resistance at the sensor leads (remove sensor if needed) and compare to the manufacturer resistance vs temperature table. If out of range, replace sensor.
  5. Check continuity between sensor ground and battery/chassis ground and between signal wire and PCM connector; check for unexpected shorts to power or ground.
  6. If wiring and connector check good but signal still bad, disconnect sensor and measure for open circuit/short. Replace connector or repair wiring as needed.
  7. If repairs performed, clear codes and road test while monitoring live data for CAC sensor B and related parameters to verify correct operation.
  8. If wiring and sensor check good and issue persists, verify PCM input circuit functionality or update PCM software per service information; consult manufacturer bulletins.

Likely causes

  • Damaged wiring between sensor and PCM (chafing, rodent bite, broken wire)
  • Connector terminal corrosion or bent pins at sensor or PCM
  • Failed sensor thermistor element or cracked sensor housing allowing coolant ingress
  • Short to ignition-switched voltage or to chassis ground on the signal circuit

Fault status

⚠️ Status
Charge Air Cooler Coolant Temperature Sensor B circuit out of expected range or not performing within expected parameters.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0115 P0117 P0118 P0128 P2AC9
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