Powertrain, generic (extended)

P2033 Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2033 means the signal of exhaust gas temperature sensor 2 on bank 1 is above its valid range. On the Opel/GM 2.0 CDTi in the Saab 9-5 (2010) the sensor in the particulate filter reads high voltage when cold, so more than 1.6 V for over 1 s means an open circuit, an unplugged connector or a short to voltage; it is Type A. GM's 2009 Duramax sets it above 3.37 V, equivalent to 1000 °C, for 300 s, which on that sensor is a short to voltage rather than an open. GM's 2018 diesels use a resistance-equivalent limit above 922 Ω (Type B), Ford's 2023 diesels 2.66 V within 2 s. Sensors near the filter see repeated heat cycles, and their leads and connectors are exposed to road water. The ECM loses the filter temperature and normally stops regeneration, so soot builds up until the fault is fixed.

Likely causes

Sensor element open after heat cycling
Connector unplugged, loose or corroded
Signal wire shorted to voltage

Symptoms

  • Malfunction indicator lamp on
  • DPF regeneration inhibited, soot load rises

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–300
Time0.3–1.5 h

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

Parts involved

exhaust gas temperature sensoregt wiringecm

Related codes

P2031P2032P2036P0546

References: saabwisonline.com, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.