P20C2 on Jeep
Reductant Heater "C" Control Circuit Performance
P20C2 on Jeep vehicles indicates reductant heater "c" control circuit performance. Au7o has documented this code across 1 Jeep model — most commonly on Grand Cherokee. A generic diesel emissions code on SCR-equipped vehicles (Ford, RAM/Cummins, GM Duramax, Mercedes, VW and many medium/heavy-duty diesels). The powertrain control module commanded the "C" diesel exhaust fluid (DEF) heater on and the measured circuit voltage or current fell outside the expected range. The letter "C" designates one of several heaters on vehicles with multiple DEF heaters - typically the tank, supply lines, or injector hose. These heaters keep DEF from freezing or crystallizing in cold weather; when one underperforms the SCR system can stop dosing. Expect a warning light and, if ignored, a speed limit or no-restart derate.
Common Causes of P20C2
- •Failed DEF tank or supply-line heater element (heater C)
- •Corroded or damaged connector at the DEF header/tank unit
- •Chafed, open, or shorted wiring in the heater control circuit
- •Failed heater relay or blown fuse feeding the heater circuit
- •Faulty DEF header assembly
- •Failed ECM/PCM heater driver
P20C2 on Jeep by Model
Jeep Grand Cherokee(1 issue)
- 2014-2016 Grand Cherokee EcoDiesel DEF/SCR Faults - Diagnose Before Replacing Parts2014-2016
A DEF/SCR warning or reductant-system DTC on a 2014-2016 Grand Cherokee EcoDiesel does not prove that the complete DEF tank has failed. FCA documentation shows materially different causes and remedies within this model range: one defined 2015 population received PCM software and a fluid-level reset for reductant codes, while a separate, narrowly defined 2015 VIN/build population with manufacturing contamination required several DEF/SCR components. Eligible vehicles that received the Approved Emissions Modification may also have extended-warranty coverage for multiple DEF-system parts and diagnostic scanning. The previous card collapsed all of these paths into one integrated-tank diagnosis and published two unverified retail searches.
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View P20C2 across all makes →Frequently Asked Questions
What does P20C2 mean on Jeep?▼
P20C2 stands for "Reductant Heater "C" Control Circuit Performance." A generic diesel emissions code on SCR-equipped vehicles (Ford, RAM/Cummins, GM Duramax, Mercedes, VW and many medium/heavy-duty diesels). The powertrain control module commanded the "C" diesel exhaust fluid (DEF) heater on and the measured circuit voltage or current fell outside the expected range. The letter "C" designates one of several heaters on vehicles with multiple DEF heaters - typically the tank, supply lines, or injector hose. These heaters keep DEF from freezing or crystallizing in cold weather; when one underperforms the SCR system can stop dosing. Expect a warning light and, if ignored, a speed limit or no-restart derate. On Jeep specifically, this code is documented across 1 model.
What causes P20C2 on Jeep vehicles?▼
Common causes on Jeep: Failed DEF tank or supply-line heater element (heater C), Corroded or damaged connector at the DEF header/tank unit, Chafed, open, or shorted wiring in the heater control circuit, Failed heater relay or blown fuse feeding the heater circuit, Faulty DEF header assembly. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P20C2 on a Jeep?▼
Repair costs vary widely depending on the root cause and specific Jeep model.
Which Jeep models have P20C2 documented?▼
Au7o has documented P20C2 on 1 Jeep model: Grand Cherokee.