Powertrain, generic (extended)

P2468 Exhaust Gas Temperature Sensor Circuit Low (Bank 2 Sensor 3)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2468 reports that probe 3 in the bank 2 exhaust line delivers a signal below the lowest value the input can produce with an intact circuit. With the usual resistive probes this nearly always means the signal line or the sensor itself has a ground short. No manufacturer lists this bank 2 code publicly; the neighbouring low codes show the scale. Ford's 2023 diesels treat anything below 0.10 V as a fault once ignition is on and supply lies between 9 and 16.25 V, judged within about 2 s, and GM's 2020 diesel tables flag a probe resistance below 158 Ω for sensor 4 as a Type B fault after 10 of 20 samples. CARB demands out-of-range checks for such inputs. Look for chafed insulation against the exhaust or a melted connector. The opposite fault, signal too high or open, is P2469.

Likely causes

Signal wire chafed through and touching ground
Internal short inside the probe
Connector melted or with water ingress

Symptoms

  • MIL on
  • Probe shows an implausible value at a standstill
  • Regeneration or DEF dosing inhibited

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–350
Time0.3–1.5 h

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

Parts involved

egt sensor b2s3

Related codes

P2466P2467P2469P246AP242CP2475

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.