OBD-II Diagnostic Trouble Code
P244D — Exhaust Gas Temperature Too High Bank 1
The ECM measured bank 1 exhaust gas temperature above its allowed limit, often during a regen at the DOC outlet or DPF inlet. Too much heat can crack the DPF or damage the turbo. The ECM may stop dosing or reduce fueling to protect the aftertreatment.
Severity 4/5
Truck-relevant
Stop within 50 mi
Severity
Stop within 50 mi
Exhaust Gas Temperature Too High Bank 1
Code
P244D
Category
Powertrain
Subsystem
Aftertreatment
Truck-relevant
Yes
What this means for truckers
Stop within ~50 miles on a Cummins X15, Detroit DD15, PACCAR MX-13. Driving longer risks damaging adjacent components (turbo housing, head gasket, aftertreatment) and turning a $300 fix into a $3,000 fix.
Before you replace parts — try this first
P244D on the Aftertreatment system is most often aftertreatment doser or 7th injector leaking or stuck open, over-fueling the doc — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Expect a check-engine or high exhaust temperature lamp, a regen abort, engine derate, and sometimes a burning smell or glowing exhaust parts. Severe cases crack or melt the DPF.
Common causes
- CommonAftertreatment doser or 7th injector leaking or stuck open, over-fueling the DOC ($300–$1200)
- OccasionalOverloaded DPF causing an uncontrolled soot burn during regen ($400–$6000)
- OccasionalLeaking engine injectors or oil entering the exhaust from the turbo, adding fuel to the DOC ($800–$5000)
- OccasionalFaulty exhaust temperature sensor reading high ($120–$400)
How to fix
Compare exhaust temperature sensors at key-on after a cold soak to confirm sensor accuracy
When to use: First step
Check the aftertreatment doser for leakage with the dosing shutoff test, and inspect the DOC face for wet fuel
When to use: When high temperatures happen during or right after dosing
Check for oil from the turbo seals and do injector cutout or leakdown tests
When to use: When high temperatures occur without dosing
Inspect the DPF for cracking after an overtemperature event
When to use: After any confirmed high temperature excursion
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P244A — Diesel Particulate Filter Differential Pressure Too Low
- → P244B — Diesel Particulate Filter Differential Pressure Too High
- → P244C — Exhaust Gas Temperature Too Low Bank 1
- → P245A — EGR Cooler Bypass Control Circuit/Open
- → P246E — Particulate Filter Active/Intrusive Injection Quantity Too Low Bank 1
Frequently Asked Questions
Can I drive with code P244D?
Drive with caution. P244D is severity 4 — stop within ~50 miles. Most commercial diesel codes at this severity (turbo, fuel rail, transmission solenoid) can damage adjacent expensive components if left unrepaired. Get to a service location before highway-speed loads.
How much does it cost to fix P244D on a commercial truck?
Total repair cost ranges $120–$6000 depending on the root cause. The cheapest fix is usually the first one listed below — Aftertreatment doser or 7th injector leaking or stuck open, over-fueling the DOC — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P244D fail a DOT inspection?
Yes — P244D is an emissions-related code, and DOT inspectors check emissions compliance. An active emissions code with a check engine light can result in an out-of-service violation under FMCSA Part 393. The truck typically can't be moved until the code is cleared. Repeated emissions violations escalate to CSA scores.
What's the difference between P244D and related codes?
P244D is closely related to: P244A (Diesel Particulate Filter Differential Pressure Too Low), P244B (Diesel Particulate Filter Differential Pressure Too High), P244C (Exhaust Gas Temperature Too Low Bank 1), P245A (EGR Cooler Bypass Control Circuit/Open). These codes share the same subsystem (aftertreatment) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P244D is set without the companions, the issue is more isolated.
How do I prevent P244D from coming back after a repair?
For P244D (Exhaust Gas Temperature Too High Bank 1), prevention centers on the aftertreatment system. Run quality DEF (verify supplier — BlueDEF, PEAK, Yara Air1). Don't skip parked regens — when the dash asks for one, do it. Avoid extended idle time which fouls the DPF. Replace NOx sensors at the OEM interval (typically 400K miles).