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U0622 Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 2

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

U0622 covers the second exhaust temperature measuring point on bank 2 when it is a digital sensor that transmits its value as SENT or CAN messages. The controller sets it once those messages stop or keep failing their checks, for instance after a broken signal wire, a lost 5 V supply or a fault inside the sensor module, an electronics box that on active sensors must tolerate up to 140 °C beneath the car. No manufacturer publicly documents U0622: GM's diesels with SENT temperature sensors have only one bank, and the Bentley V8 bulletins name only the sensors at position 1. CARB requires a dedicated code for a digital input that stops communicating, which is the role of this code. Judging by the documented neighbours, the harness routing near the exhaust is the first thing to inspect. Analog faults here are P2034 to P2036.

Likely causes

Sensor wiring chafed or melted along the bank 2 exhaust

5 V supply or ground to the sensor interrupted

Heat-damaged electronics module of the sensor

Symptoms

Malfunction indicator lamp
Exhaust temperature for bank 2 sensor 2 missing in live data

Repair estimate

DifficultyMediumDIY possible

Parts and labour€60–450

Time0.5–2 h

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

Parts involved

egt sensor bank 2 sensor 2sensor wiring

References: law.cornell.edu, sensience.com, smpengineeredsolutions.com.