P00E8

Code

Generic P — Powertrain

Intake Air Temperature Sensor 3 Circuit Bank 1

Brand: Generic

Type: P — Powertrain

Views: UK: 29 EN: 56 RU: 24

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Page language: EN

Causes

Open circuit in IAT sensor 3 wiring (broken wire, connector pin not seated)
Short to ground or short to battery/other circuit in the sensor signal or reference wire
Faulty IAT sensor (NTC thermistor element or internal connector)
Corroded/dirty connector or terminal causing poor contact
Water intrusion or physical damage to harness near intake
PCM/ECM internal fault (least common)

Symptoms

Check Engine Light (MIL) illuminated
Incorrect intake air temperature reading in scan tool or erratic values
Poor cold/hot starting, extended warm-up, or altered idle/fuel trims
Reduced fuel economy or drivability issues if PCM uses IAT for fueling/ignition
Possible stored freeze-frame data showing fault conditions

What to check

Retrieve DTC(s) and freeze-frame data with a scan tool; note related codes and conditions
Visually inspect IAT sensor 3 and wiring harness for damage, corrosion, pin push-out, or water exposure
Backprobe sensor connector with key ON and check for proper reference voltage and ground
Measure sensor signal voltage with engine off and with intake exposed to changing air temperature (blow air from a hairdryer/canned air)
Measure sensor resistance (with sensor disconnected) across sensor terminals and compare to expected NTC behavior (resistance falls as temp rises)
Perform continuity and short-to-ground/short-to-voltage checks between sensor pins and PCM connector pins

Signal parameters

Sensor type: typically NTC thermistor (resistance decreases as temperature rises)
Expected signal voltage: generally between ~0.5 V and ~4.5 V depending on air temperature (varies by manufacturer)
Reference voltage: typically 5 V supply from ECM (verify for the specific vehicle)
Expected behavior: open circuit → very high/infinite resistance or no signal/voltage; short to ground → near 0 V signal; short to battery → near reference voltage (~5 V)
Exact resistance vs temperature curve is manufacturer-specific — compare measured resistance to OEM spec if available

Diagnostic algorithm

Confirm P00E8 is current and note freeze-frame/related codes. Clear code and attempt to re-create to confirm persistence.
Identify exact location of IAT Sensor 3 Bank 1 (refer to vehicle service manual). Visually inspect connector and harness for damage, corrosion, fluid intrusion or pin damage.
With ignition ON (engine OFF) backprobe connector: verify reference voltage (usually ~5 V) at sensor reference/power pin and a good ground on ground pin. Record signal voltage with ambient air temp.
Disconnect sensor and measure resistance across sensor terminals at ambient. Compare behavior by warming/cooling sensor (breath/hairdryer) to verify resistance decreases as temp rises. If resistance is open or does not change, replace sensor.
If sensor tests good, check harness continuity between sensor connector and ECM connector for signal, reference and ground. Check for shorts to ground and battery using an ohmmeter or wiring diagrams.
Repair any open/short/damaged wiring or corroded connector. Use proper terminals, dielectric grease, and secure routing away from heat/sharp edges.
If wiring and sensor check good but fault persists, recheck ECM inputs and grounds; consider ECM/PCM fault only after excluding sensor and wiring.
After repairs, clear DTCs, perform a test drive or run conditions to verify code does not return and that IAT readings are reasonable in live data.

Likely causes

Damaged connector at IAT sensor 3 (corrosion, bent pins)
Open/shorted harness between sensor and ECM (pinched, chafed)
Failed IAT sensor element on sensor 3
Poor ground or missing reference voltage to the sensor

Fault status

⚠️ Status

P00E8 — Intake Air Temperature Sensor 3 Circuit, Bank 1. MIL may be illuminated; freeze-frame and live data should show abnormal or out-of-range IAT readings. Further testing of sensor and wiring required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours