Powertrain, generic (extended)

P2429 Exhaust Gas Temperature Too High (Bank 2)

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2429 reports excessive exhaust heat on bank 2 and therefore exists only on engines with two separately monitored exhaust branches, such as V diesels with an aftertreatment line per bank. No manufacturer publishes P2429. The bank 1 version P2428 is documented by GM for a 2014 diesel as an immediate Type A fault with several temperature and temperature-rise limits around the oxidation catalyst and the particulate filter; a bank 2 code would be expected to work the same way on its own sensors. CARB requires rationality monitoring for any exhaust temperature sensor that feeds a control strategy. Before replacing hardware, compare the bank 2 readings with bank 1 and look for a misfiring or leaking cylinder on that side.

Likely causes

Excessive soot burn in the bank 2 filter

Leaking injector or misfire on bank 2 sending fuel into the exhaust

Bank 2 exhaust temperature sensor reading high

Symptoms

Warning lamp with reduced engine power
Unusual heat or smell from one side of the exhaust

Repair estimate

DifficultyHardWorkshop job

Parts and labour€100–3,000

Time1–6 h

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

Parts involved

exhaust gas temperature sensor b2dpf b2

Related codes

P2428 P0547 P2463

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