P2457 on BMW
Exhaust Gas Recirculation Cooling System Performance
P2457 on BMW vehicles indicates exhaust gas recirculation cooling system performance. Au7o has documented this code across 1 BMW model — most commonly on 7 Series. Generic code set when the PCM determines the EGR cooler/cooling system is not lowering recirculated exhaust gas temperature as much as expected — the cooler is underperforming, often due to clogging, coolant flow loss, or a stuck bypass.
Common Causes of P2457
- •Carbon-clogged/restricted EGR cooler
- •Loss of coolant flow through the cooler
- •Stuck EGR cooler bypass valve
- •Faulty temperature sensors used for the monitor
P2457 on BMW by Model
BMW 7 Series(1 issue)
- N57 Diesel EGR Cooler Internal Coolant Leak - Intake Manifold Fire Risk (740Ld xDrive)2015
The 740Ld xDrive uses the N57 inline-six diesel, whose EGR cooler can crack and leak coolant internally. The coolant mixes with diesel soot inside the EGR path, and at high EGR gas temperatures those wetted soot particles can smolder, melting the plastic intake manifold and creating a risk of underhood fire. NHTSA recall campaign 18V-755 (October 2018) covered 2013-2017 BMW diesels including the 2015 740Ld, and recall 21V-907 (November 2021) superseded and expanded it to roughly 50,400 vehicles, re-including every car previously covered by 18V-755. This is an active fire-risk recall, not a nuisance item.
Looking for P2457 on a different make?
View P2457 across all makes →Frequently Asked Questions
What does P2457 mean on BMW?▼
P2457 stands for "Exhaust Gas Recirculation Cooling System Performance." Generic code set when the PCM determines the EGR cooler/cooling system is not lowering recirculated exhaust gas temperature as much as expected — the cooler is underperforming, often due to clogging, coolant flow loss, or a stuck bypass. On BMW specifically, this code is documented across 1 model.
What causes P2457 on BMW vehicles?▼
Common causes on BMW: Carbon-clogged/restricted EGR cooler, Loss of coolant flow through the cooler, Stuck EGR cooler bypass valve, Faulty temperature sensors used for the monitor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2457 on a BMW?▼
Repair costs vary widely depending on the root cause and specific BMW model.
Which BMW models have P2457 documented?▼
Au7o has documented P2457 on 1 BMW model: 7 Series.