P2457 on BMW: How to Diagnose & Fix
Exhaust Gas Recirculation Cooling System Performance
1 BMW model · 1 documented issue · 1 critical
P2457 on BMW by model: symptoms, diagnosis and fix
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18V-755 (October 2018) covered 2013-2017 BMW diesels including the 2015 740Ld, and recall 21V-907 (November 2021) superseded and expanded it to roughly 50,400 vehicles, re-including every car previously covered by 18V-755.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.
Common Symptoms
- Unexplained coolant loss with no visible external leak
- White smoke from the exhaust
- Burning smell from the engine bay
- Reduced power or limp mode
- Check engine light
How to Fix
Take the VIN to a BMW dealer under recall 21V-907 - the repair is free. Dealers inspect and replace the EGR cooler; if a leak has already occurred, the intake manifold is replaced as well. Verify status by VIN at nhtsa.gov/recalls, since a car repaired under the earlier 18V-755 campaign is still covered by the 2021 expansion. Do not dismiss unexplained slow coolant loss with no external leak on an N57 diesel - that is the leading indicator.
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Sources for this issue (3)
P2457 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2457 mean on a 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 it is documented across 1 model: 7 Series.
What are the most common causes of P2457?
The most common causes of P2457 are: Carbon-clogged/restricted EGR cooler, Loss of coolant flow through the cooler, Stuck EGR cooler bypass valve, Faulty temperature sensors used for the monitor. The specific cause varies by vehicle.
How much does it cost to fix P2457 on a BMW?
Repair costs vary widely with the root cause and BMW model; each issue on this page carries its own estimate where one is published.
Looking for P2457 on a different make?
View P2457 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.