P00E2

Code

Generic P — Powertrain

Charge Air Cooler Coolant Temperature Sensor A Intermittent/Erratic

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 31 RU: 32

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Page language: EN

Causes

Open or short in sensor circuit (intermittent wiring break)
Corroded, loose or contaminated connector/pins
Failed or internally intermittent temperature sensor (thermistor)
Poor sensor ground or reference voltage (ECU supply)
Coolant contamination or air pocket around sensor
Damage from heat, vibration or rubbing harness

Symptoms

Malfunction Indicator Lamp (MIL) set with P00E2 stored
Erratic or jumping charge-air cooler temperature readings on scan tool
Intermittent turbo boost control or reduced performance if ECU relies on intercooler temp
Engine derate or limp mode in some systems
Poor fuel control or transient drivability issues under some conditions
No obvious coolant temperature change at sensor during warm-up/cool-down

What to check

Read freeze frame and stored data with a scan tool; note operating conditions when code set
Monitor live charge-air cooler coolant temperature PID for jumps, dropouts or inconsistent response
Compare intercooler coolant temp to engine coolant temp and ambient temperature — values should change smoothly with warming/cooling
Visually inspect sensor connector and wiring for corrosion, bent pins, damaged insulation or rubbing marks
Perform a wiggle test on harness and connector while watching live data to reproduce intermittent behavior
Check coolant level and for air pockets in charge-air cooler circuit (air can cause erratic readings)

Signal parameters

Sensor should show a smooth, monotonic change with temperature (no sudden jumps)
Typical signal voltage range (manufacturer-specific) usually spans roughly 0.2–4.8 V depending on temp — verify with OEM chart
Thermistor resistance typically decreases as temperature rises; consult OEM resistance vs temperature table for exact values
Reference supply often 5 V (or ECU-specific); reference and ground should be stable with key ON and engine running
If intermittent, voltage or resistance may jump or drop to open-circuit/high resistance values sporadically

Diagnostic algorithm

Verify code and gather data: Connect a scan tool, record freeze frame and monitor live intercooler coolant temp PID while performing key-on, cranking and during drive conditions where fault occurred.
Visual inspection: With engine off, inspect the sensor, connector and harness for corrosion, bent pins, heat damage, or chafing. Repair any obvious damage.
Wiggle/backprobe test: Backprobe the sensor connector and monitor live data. Wiggle the harness and connector to try to reproduce intermittent changes. If data jumps with movement, suspect wiring/connector.
Check reference and ground: With key ON, measure sensor reference voltage and ground continuity to chassis/ECU. Compare to manufacturer spec. Repair open/poor grounds or reference wiring as needed.
Functional warm/cold test: Warm the sensor area with hot water (or let engine warm) while watching live PID — temperature should change smoothly. If sensor does not respond or behaves erratically, test sensor directly.
Measure sensor resistance/voltage: Disconnect sensor and measure resistance vs temperature or measure signal voltage with known reference. Compare to OEM chart. Replace sensor if out of spec or intermittent.
Inspect coolant circuit: Verify correct coolant level and eliminate air pockets in charge-air cooler loop; flush/replace contaminated coolant if necessary.
Repair wiring/connectors: Repair or replace damaged harness sections, clean/replace corroded connectors, and secure harness to prevent vibration damage.
Re-test: Clear codes, retest operation under previously failing conditions and monitor for recurrence. If intermittent persists and wiring and sensor verified good, consider ECU input circuit fault and follow manufacturer procedures.
Document findings and repair; if ECU suspected, perform bench/diagnostic supplier procedures before replacement.