Powertrain, generic (extended)

P2034 Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Sensor lead open or shorted where it runs along the hot exhaust
Sensing element failed after many heat cycles
Water or corrosion in the sensor connector
Sensor ground or supply from the control unit faulty

Symptoms

  • Engine warning lamp on
  • DEF dosing or particulate filter regeneration restricted
  • Engine power reduced on some applications

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–350
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

exhaust gas temperature sensoregt harness

Related codes

P2035P2036P2086P2087P2031

References: serdia.deutz.com, gsi.ext.gm.com, law.cornell.edu.