P00E5

Code

Generic P — Powertrain

Intake Air Temperature/Fuel Temperature Correlation

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 61 RU: 29

AI status

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Page language: EN

Causes

Faulty intake air temperature (IAT) sensor
Faulty fuel temperature sensor (fuel temp sender)
Damaged, shorted or open wiring or poor connector grounds for one or both sensors
Incorrect sensor installation or wrong replacement sensor
Contamination, water ingress or corrosion at sensor or connector
Sensor exposure to an abnormal heat source (exhaust, turbocharger, heater) or fuel heating

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Possible rough idle, hesitation or reduced drivability
Abnormal fuel trims or poor fuel economy
Difficulty starting (cold or warm) in some cases
Increased emissions or failed readiness for emissions test

What to check

Read and record freeze frame and live data for IAT and fuel temperature sensors
Verify both sensors show plausible temperatures for current ambient/engine conditions
Check for additional related DTCs for IAT, fuel temp, or wiring
Visually inspect sensors, connectors and wiring for damage, corrosion or contamination
Backprobe sensor connectors; measure voltage, signal and ground integrity with engine running
Measure sensor resistance at known temperatures (or use a calibrated thermometer for comparison)

Signal parameters

Typical sensor outputs: 0–5 V signal or variable resistance (NTC style) depending on vehicle
IAT typical range: -40°C to +100°C (-40°F to +212°F) reported to PCM (exact range varies by vehicle)
Fuel temp typical range: -40°C to +150°C (-40°F to +302°F) reported to PCM (vehicle dependent)
NTC sensors: resistance decreases as temperature rises (values vary; consult vehicle spec)
Expected correlation: under steady ambient conditions fuel temp often within ~5–15°C (9–27°F) of intake air temp; significant, implausible deviation triggers code

Diagnostic algorithm

Retrieve DTC and freeze-frame data. Note engine load, RPM, coolant temp, ambient temp and sensor values when code set.
Scan for other codes (IAT, fuel temp, grounds) and address those first if present.
With engine off, visually inspect IAT and fuel temp sensors, connectors and wiring for damage, corrosion or loose pins.
With ignition ON (engine OFF) measure sensor reference voltage and ground at connector; confirm within manufacturer spec (usually 5 V reference and good ground).
Start engine and record live IAT and fuel temperature readings as engine/ambient warm; look for plausibility and relative change when warming.
Perform resistance check of each sensor at ambient and compare to specification or use a calibrated thermometer to verify sensor accuracy.
Wiggle harness/connectors while monitoring live data to find intermittent issues; repair any chafing or shorts.
If wiring and connectors are good but one sensor reads out of specification, replace that sensor and retest.
After repairs clear codes and perform road test or drive cycle to confirm code does not return and readiness is restored.
If problem persists and sensors and wiring test good, consult manufacturer TSBs and consider PCM reflash or replacement as a last step.

Likely causes

Open/short or poor connector/ground on the fuel temp sensor circuit
Faulty fuel temperature sensor
Faulty IAT sensor or intake air sensor harness damage
Sensor installed in wrong location or incompatible part after service

Fault status

⚠️ Status

PCM detected an implausible difference between intake air temperature and fuel temperature sensor readings. MIL set; freeze frame stored. Check sensors, wiring and grounds; verify sensor readings under known conditions.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours