P2428 code meaning
Exhaust Gas Temperature Too High (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P2428 means
P2428 is a protection code: the exhaust on bank 1 has become hot enough to endanger the aftertreatment, above all the diesel particulate filter. GM's 2014 diesel tables (14OBDG04) list five triggers, any of which fails the test after 6 seconds: about 800 °C ahead of the oxidation catalyst, 900 °C behind it, 800 °C behind the filter, or rises of more than 600 °C across the catalyst and 400 °C across the filter. The fault is Type A, so the lamp comes on at once. The usual origin is an uncontrolled soot burn in the filter, late fuel injected during regeneration or a leaking injector. CARB requires plausible EGT sensors, so a faulty sensor must be ruled out first. Engine power is usually limited.
P2428 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 P2428
- Warning lamp on immediately, often with reduced power
- Strong heat or burning smell from the exhaust
- Particulate filter or catalyst damage in severe cases
Common causes of P2428
- Most likelyUncontrolled soot burn in an overloaded particulate filter
- PossibleLeaking injector or excessive post-injection reaching the catalyst
- PossibleExhaust temperature sensor reading too 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 b1DPF b1Diesel oxidation catalyst
What each part of P2428 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). |
| 28 | The exact fault in that area. |
What to do next
- Note P2428 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 P2428
What does P2428 mean?
P2428 means "Exhaust Gas Temperature Too High (Bank 1)". P2428 is a protection code: the exhaust on bank 1 has become hot enough to endanger the aftertreatment, above all the diesel particulate filter. It is a generic code, so it means the same on every make.
Is it safe to drive with P2428?
Drive gently and only to a workshop. With P2428 the car can go into limp mode (reduced power) to protect itself.
Will P2428 fail an emissions test?
Yes, it can. P2428 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 P2428 to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P2428 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.