Code
P247C
Generic
P — Powertrain
Exhaust Gas Temperature Out of Range Bank 2 Sensor 1
Views:
UK: 17
EN: 49
RU: 23
AI status
Completed
Completed
100%
Causes
- Failed or degraded EGT sensor (Bank 2, Sensor 1)
- Open, short or high resistance in sensor wiring or poor connector connection
- Contaminated or damaged sensor (soot, oil, molten deposits)
- Exhaust leak or damaged turbo manifold near the sensor
- Turbocharger malfunction creating abnormal exhaust temperatures
- Heater circuit failure (if equipped) or fused power/ground problem
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine performance or limp mode (if ECM limits output)
- Poor fuel economy or unexpected fueling adjustments
- Rough running or misfires under load
- High or erratic exhaust temperatures during acceleration or boost
- May be no noticeable driveability change other than MIL
What to check
- Read and record freeze frame and all stored codes with a scan tool
- Compare live EGT readings for Bank 2 Sensor 1 and Bank 1 Sensor 1 under the same conditions
- Visual inspection of the sensor, connector and wiring for damage, heat exposure, contamination or corrosion
- Inspect nearby exhaust for leaks, cracks, or turbocharger damage
- Check for related codes (misfire, boost, fuel trim) that could cause abnormal EGT
- Verify power, ground and heater fuse/relay to the sensor (if applicable)
Signal parameters
- EGT behavior: temperature should rise with load and decrease at idle or decel; compare Bank 2 vs Bank 1
- Typical operating EGT range varies by vehicle and load — verify OEM specs before judging absolute value
- Heater circuit (if present): fused 12 V supply to sensor heater and good ground; heater resistance should match OEM spec (often a few ohms)
- Thermocouple output: very low voltage at ambient, increases with temperature (check manufacturer mV/°C curve)
- Thermistor: resistance/voltage varies predictably with temperature (check service table)
Diagnostic algorithm
- Retrieve codes and freeze-frame data. Note engine load, RPM, coolant temp and ambient conditions when the code set.
- Perform a visual inspection of Bank 2 Sensor 1, connector and harness for heat damage, contamination, loose pins or corrosion.
- With key on engine off, verify presence of reference power and ground at the sensor connector (refer to wiring diagram). Check fuses/relays for heater circuit if equipped.
- Backprobe the sensor and monitor live EGT values while warming engine and under controlled load. Compare to Bank 1 Sensor 1. Look for stuck, out-of-range, or non-responsive readings.
- Measure heater resistance (if applicable) and compare to spec. If heater circuit is powered but heater reads open/high resistance, replace sensor.
- Check wiring continuity between sensor connector and ECU. Repair any opens/shorts/corrosion found. Perform wiggle test while monitoring live data to find intermittent faults.
- Inspect exhaust manifold/turbo and downstream piping for leaks, melted insulation, collapsed turbine or obstructions that could cause abnormally high or low EGTs.
- If wiring and exhaust hardware are good, swap Bank 2 Sensor 1 with an identical known-good sensor (if practical and sensors share part numbers) to see if the code follows the sensor.
- Clear codes and perform road/loaded test under conditions that previously set the code. If code returns, consider ECM or further in-depth diagnostics per manufacturer.
- Replace sensor only after confirming wiring, heater power/ground and exhaust integrity, then verify repair by clearing codes and re-testing.
Likely causes
- Faulty Bank 2 Sensor 1
- Wiring open/short or bad ground at the sensor connector
- Connector corrosion or water intrusion
- Exhaust leak or turbo housing damage near the sensor
- Heater circuit fuse or relay open (for heated EGT sensors)
Fault status
Status
Exhaust gas temperature reading from Bank 2 Sensor 1 is outside expected range or not responding as monitored by the ECM.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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