P204F on Jeep
Reductant System Incorrect Quantity
P204F on Jeep vehicles indicates reductant system incorrect quantity. Au7o has documented this code across 1 Jeep model — most commonly on Grand Cherokee. This code is set on diesel SCR-equipped vehicles when the reductant (diesel exhaust fluid / DEF) system delivers an incorrect quantity of DEF, meaning the actual dosing or pressure doesn't match what the computer commanded. The reductant system pumps and injects DEF into the exhaust so the SCR catalyst can break down NOx emissions, and the computer monitors pressure and dosing performance. When it sees too much or too little fluid being delivered, or pressure that's out of range, it flags this performance code. Typical roots are a clogged or failing DEF pump, contaminated fluid, a faulty pressure sensor, or a bad injector. Typical repair costs on Jeep range from $900 to $2,500, depending on the specific model and root cause.
Common Causes of P204F
- •Contaminated or poor-quality diesel exhaust fluid (DEF)
- •Faulty reductant (DEF) pressure sensor
- •Clogged DEF pump filter or weak/failing DEF pump
- •Faulty or clogged reductant injector
- •Leaking, cracked, or loose DEF lines/clamps
- •Crystallized DEF buildup blocking the system
- •Failed reductant/SCR control module
- •Wiring or connector faults in the reductant system
P204F on Jeep by Model
Jeep Grand Cherokee(1 issue)
- 3.0L EcoDiesel DEF Tank/Heater/Pump Failure Triggering Limp Mode and No-Start Countdown2014-2016
The diesel-exhaust-fluid (DEF/reductant) system on the 3.0L EcoDiesel Grand Cherokee is a frequent failure point. The integrated DEF tank assembly bundles the pump, heater, and level/temperature/pressure sensors into one unit; when any single internal component fails (commonly the pump pressure or the tank heater), it sets emissions codes. Because Mopar does not sell the internal components separately, a single failure requires replacing the entire tank assembly. Critically, an unresolved DEF fault escalates to a speed-limited limp mode and ultimately a no-start once the dashboard mileage countdown expires, stranding the vehicle.
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What does P204F mean on Jeep?▼
P204F stands for "Reductant System Incorrect Quantity." This code is set on diesel SCR-equipped vehicles when the reductant (diesel exhaust fluid / DEF) system delivers an incorrect quantity of DEF, meaning the actual dosing or pressure doesn't match what the computer commanded. The reductant system pumps and injects DEF into the exhaust so the SCR catalyst can break down NOx emissions, and the computer monitors pressure and dosing performance. When it sees too much or too little fluid being delivered, or pressure that's out of range, it flags this performance code. Typical roots are a clogged or failing DEF pump, contaminated fluid, a faulty pressure sensor, or a bad injector. On Jeep specifically, this code is documented across 1 model.
What causes P204F on Jeep vehicles?▼
Common causes on Jeep: Contaminated or poor-quality diesel exhaust fluid (DEF), Faulty reductant (DEF) pressure sensor, Clogged DEF pump filter or weak/failing DEF pump, Faulty or clogged reductant injector, Leaking, cracked, or loose DEF lines/clamps. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P204F on a Jeep?▼
Repair costs on Jeep range from $900 to $2,500, depending on the specific model and root cause.
Which Jeep models have P204F documented?▼
Au7o has documented P204F on 1 Jeep model: Grand Cherokee.