P2457 on RAM: How to Diagnose & Fix
Exhaust Gas Recirculation Cooling System Performance
1 RAM model · 1 documented issue · 1 critical · $500-$1,800 repair
P2457 on RAM by model: symptoms, diagnosis and fix
The EGR cooler routes hot exhaust through a coolant-jacketed heat exchanger before recirculating it into the intake. Heavy soot loading progressively plugs the cooler and EGR valve, first showing as slight off-idle hesitation and rising EGTs, then triggering EGR flow/performance codes and limp mode. Worse, a clogged, thermally stressed cooler can crack internally and leak coolant into the exhaust/intake stream, causing white smoke, coolant loss, and potential hydrolock or catastrophic engine damage. Cummins service intervals call for cleaning the EGR valve/cooler roughly every 67,500 miles (2007.5-2018) or 75,000 miles (2019+), which many owners never perform.
Common Symptoms
- Hesitation off idle
- Rising exhaust gas temperatures under load
- White exhaust smoke / sweet coolant smell
- Unexplained coolant loss
- Check engine light with EGR flow codes
- Reduced power / limp mode
How to Fix
Clean or replace the EGR cooler and valve. Genuine replacement cooler OEM PNs include 68048988AA (and related 4988885 / 4988884 / 68048991AA / 68444764AA for later trucks); an upgraded H-core cooler (e.g., BulletProof Diesel) resists cracking and clogging better than stock. Replace the EGR valve if the pintle is coked. Keep the DPF/regen system healthy, avoid excessive short-trip idling, and inspect/clean on Cummins' recommended interval to prevent the crack-and-coolant-loss failure mode.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Bullet Proof Diesel 6700121 H-Core EGR cooler
Confirm connection style and return-core terms.
- Bullet Proof Diesel 6700120 H-Core EGR cooler
Confirm existing cooler and connector style.
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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 RAM?
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 RAM it is documented across 1 model: 2500.
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 RAM?
Published repair estimates on RAM range from $500 to $1,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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.