P20E5Exhaust Gas Temperature Sensor 1/2 Correlation (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P20E5 is the bank 2 counterpart of P20E2: on engines with a separate exhaust and aftertreatment path per cylinder bank, sensors 1 and 2 of the second bank disagree after the system has cooled down. No manufacturer documents this exact code publicly; the GM tables that use P20E2 cover single-path diesels. The method is known from Cummins' patent US7771113: once the exhaust has cooled, the thermistors ahead of and behind the oxidation catalyst are checked against each other and an offset sensor is identified, even when its reading is still within range. CARB requires rationality monitoring of every temperature sensor used by an emission strategy. Bank 2 circuit or range faults use P0548, P2082 or P2034. The driver sees the MIL; regeneration of the bank 2 filter may be limited.
- What you may notice
- Malfunction indicator lamp on
- Bank 2 sensors show different values on a cold engine
- Likely causes
- LikelyBank 2 sensor 1 or 2 reading offset
- PossibleContact resistance in a bank 2 sensor connector
- RareSensor connectors swapped between banks after a repair
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.