P2EA2

Code

Generic P — Powertrain

Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 6

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 35 RU: 14

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Page language: EN

Causes

Faulty EGT sensor (open/failed internal element or thermocouple shorted to heat source)
Short to battery voltage in the sensor signal circuit
Damaged, chafed, or corroded wiring harness or connector at Bank 1 Sensor 6
Poor or corroded connector pins causing intermittent high readings
PCM or sensor circuit driver fault (rare)
Actual excessive exhaust temperature due to engine or aftertreatment issues

Symptoms

Check Engine Light / MIL illuminated
Possible limp-home mode or reduced engine power if the PCM limits performance to protect components
Problems with diesel particulate filter regeneration or aftertreatment control (diesel applications)
Reduced fuel economy or drivability issues in some systems
Stored freeze-frame and related aftertreatment codes

What to check

Read and record freeze-frame and all stored DTCs; note conditions when code set (load, temp, RPM).
Visually inspect wiring and connector for Bank 1 Sensor 6 for heat damage, corrosion, pin push-out, or chafing.
Verify connector is fully seated and pins are straight; check for water/soot contamination.
Backprobe the sensor connector and monitor signal with a scan tool or multimeter while key on and engine running (if safe).
Check for power and ground at the sensor harness if applicable (some sensors require reference voltage/ground).
Wiggle test harness while monitoring signal to reproduce fault or change in reading.

Signal parameters

Sensor types vary: thermocouple sensors produce millivolt signals (typical range 0–100 mV depending on temperature) — consult OEM for exact mV/°C slope.
Some EGT sensors use a 0–5.0 V conditioned output; a circuit high fault usually means signal > expected top threshold (often >4.5–4.9 V).
Thermistor-style sensors change resistance with temperature — expect decreasing resistance as temperature rises (consult OEM resistance tables).
If circuit high is indicated, measured signal may be near battery voltage (short to 12 V) or above the normal sensor range.

Diagnostic algorithm

Verify the code with a scan tool; clear code and attempt to reproduce. Note whether the code is intermittent or permanent.
Record freeze-frame data and check for related DTCs (other EGT sensors, aftertreatment, or fuel/air system faults).
Visually inspect Bank 1 Sensor 6 connector and harness for heat damage, exposed conductors, pin corrosion, or connector contamination. Repair any obvious damage.
With key ON (engine OFF) and using a digital multimeter, backprobe the sensor signal terminal. Check for an abnormal voltage (near battery voltage) that would indicate a short to power.
Start engine (only if safe) and monitor the sensor signal with a scan tool. Observe signal behavior during warm-up; look for implausible high values or no change with temperature.
Perform a wiggle test on harness/connectors while monitoring signal to reveal intermittent opens/shorts. Check for short to power by measuring voltage between signal and battery + with ignition on.
If sensor is thermocouple/thermistor type, unplug sensor and measure resistance or open-circuit voltage per OEM procedure to confirm sensor failure. Replace sensor if readings are out of specified range.
If bench/sensor data appear good but circuit still reads high when connected, trace wiring to PCM for short to battery or damaged insulation. Repair wiring or connector as needed.
If wiring and sensor check OK, test/scan PCM inputs for corruption or replace PCM only after exhausting sensor/harness diagnosis.
After repairs, clear codes and perform road/drive cycle or heat soak test to confirm the repair; verify no recurrence and that related aftertreatment functions operate normally.

Likely causes

Damaged harness or connector (heat damage, chafe, corrosion) causing a short to voltage
Failed EGT sensor (internal short or degraded element)
Contamination or mechanical damage at the sensor mounting point

Fault status

⚠️ Status

P2EA2 — Exhaust Gas Temperature Sensor Circuit High (Bank 1, Sensor 6). The engine control module is detecting a sensor signal higher than the allowed range; possible sensor failure, wiring short to voltage, connector/corrosion, or an actual over-temperature condition.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours