P2429 code meaning
Exhaust Gas Temperature Too High (Bank 2)
Powertrain system Generic code P24xx codes Check engine light
What P2429 means
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.
P2429 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2429
- Warning lamp with reduced engine power
- Unusual heat or smell from one side of the exhaust
Common causes of P2429
- Most likelyExcessive soot burn in the bank 2 filter
- PossibleLeaking injector or misfire on bank 2 sending fuel into the exhaust
- PossibleBank 2 exhaust temperature sensor reading high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust gas temperature sensor b2DPF b2
What each part of P2429 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 29 | The exact fault in that area. |
What to do next
- Note P2429 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2429
What does P2429 mean?
P2429 means "Exhaust Gas Temperature Too High (Bank 2)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2429?
Drive gently and only to a workshop. With P2429 the car can go into limp mode (reduced power) to protect itself.
Will P2429 fail an emissions test?
Yes, it can. P2429 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2429 to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P2429 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.