P2034Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2034 is the general electrical fault of the second exhaust temperature sensor on bank 2, so it only appears where the second bank has its own measuring point downstream. GM does not use it: the 2018 diesel tables number every exhaust temperature sensor on bank 1 (P0545/P0546, P2032/P2033, P242C/P242D, P2470/P2471), as one aftertreatment line serves the whole engine. Deutz assigns P2034 on its EMR L1 engine controller (industrial engines, list of November 2022) to the second temperature sensor upstream of the SCR catalyst, with failure-type bytes: -13 open, -11 shorted to ground, -12 shorted to battery, -F0 ground fault, -1C supply out of range. Others split low and high readings into P2035 and P2036. With the reading lost, temperature-dependent DEF dosing or filter regeneration is usually limited.
- What you may notice
- Engine warning lamp on
- DEF dosing or particulate filter regeneration restricted
- Engine power reduced on some applications
- Likely causes
- LikelySensor lead open or shorted where it runs along the hot exhaust
- PossibleSensing element failed after many heat cycles
- PossibleWater or corrosion in the sensor connector
- RareSensor ground or supply from the control unit faulty
- 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 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.