OBD-II Generic Error Code P2428: How to Fix It

Q: Can I drive my car with a P2428 code?

Short trips at low load may be possible, but it is not recommended. P2428 indicates exhaust temperatures are dangerously high, which can rapidly damage the catalytic converter, DPF, turbocharger, and oxygen sensors. Have the vehicle diagnosed and repaired as soon as possible to avoid costly collateral damage.

Q: What is a normal exhaust gas temperature range?

Normal EGT at idle is typically between 300–500°F (150–260°C). Under moderate load it may reach 900–1,100°F (480–595°C), and under heavy load or wide-open throttle it can temporarily approach 1,400°F (760°C). Sustained readings above 1,400°F indicate a problem and can cause serious damage.

Q: Is P2428 more common on diesel or gasoline engines?

P2428 appears on both diesel and gasoline engines, but it is more commonly associated with diesel vehicles because diesels run at higher exhaust temperatures and are more likely to be equipped with multiple EGT sensors to protect the DPF and turbocharger.

Q: Could a bad EGT sensor cause a false P2428 code?

Yes. A faulty EGT sensor that reports an artificially high temperature reading can trigger P2428 even when actual exhaust temperatures are within normal range. Testing the sensor's resistance and comparing it to specification is a critical first step before replacing more expensive components.

Q: Will P2428 cause my vehicle to go into limp mode?

It depends on the vehicle. Many modern vehicles, especially diesels, will enter a reduced-power limp mode when P2428 is set in order to protect the exhaust system and engine. If your vehicle suddenly loses power along with this code, do not attempt to override limp mode — have it diagnosed promptly.

Abstract

Error code P2428 means your vehicle's Engine Control Module (ECM) has detected that the exhaust gas temperature (EGT) on Bank 1 is higher than the safe operating threshold. This is commonly caused by a faulty EGT sensor, a lean fuel mixture, a clogged DPF or catalytic converter, or problems with the EGR system. Left unaddressed, excessively high exhaust temperatures can damage the catalytic converter, diesel particulate filter (DPF), turbocharger, and other expensive exhaust components.