P214F
DTC P214F, P21DD, or P221C-P221F
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P214F
- Reductant Heater 1 Current Too High
DTC P21DD
- Reductant Heater 1 Current Too Low
DTC P221C
- Reductant Heater 2 Current Too Low
DTC P221D
- Reductant Heater 2 Current Too High
DTC P221E
- Reductant Heater 3 Current Too Low
DTC P221F
- Reductant Heater 3 Current Too High
Diagnostic Fault Information
Circuit/System Description
The selective catalyst reduction (SCR) system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of diesel exhaust fluid (DEF) or reductant into the exhaust gas stream entering the SCR catalyst. Within the SCR catalyst, the DEF reacts with the NOx to form nitrogen, carbon dioxide, and water vapor. Upstream and downstream NOx sensors provide the engine control module (ECM) with engine-out and tailpipe-out NOx levels in parts per million (ppm). The ECM then adjusts the amount of DEF injected upstream of the SCR based on the NOx concentration. Engine-out NOx levels as measured by NOx Sensor 1 will either increase (high ppm) or decrease (low ppm) the amount of DEF injected. The NOx concentration as measured by NOx Sensor 2 provides the ECM with both an indication of the NOx conversion efficiency within the SCR as well as confirming proper operation of the DEF system.
Conditions for Running the DTCs
P214F or P21DD
* The engine is off for greater than 90 minutes.
* The DEF tank heater is commanded ON.
* The initial tank temperature is less than 42°C (108°F).
* Ambient temperature is less than 10°C (50°F).
* The DEF is less than 15°C (59°F).
* The glow plug control module (GPCM) battery voltage is between 11-16 V.
* The GPCM temperature is less than 123°C (253°F).
* The DTCs run once per key cycle after the above conditions are met for up to 10 minutes.
P221C or P221D
* The DEF line heater is commanded ON.
* Ambient temperature is less than 5°C (41°F).
* The glow plug control module (GPCM) battery voltage is between 11-16 V.
* The GPCM temperature is less than 123°C (253°F).
* The DTCs run once the above conditions are met for up to 2 minutes.
P221E or P221F
* The engine is OFF for greater than 130 minutes.
* The DEF pump heater is commanded ON.
* Ambient temperature is less than 5°C (41°F).
* The glow plug control module temperature is less than 123°C (254°F).
* The glow plug control module battery voltage is between 7-16.5 V.
* The DTCs run continuously once the above conditions are met.
Conditions for Setting the DTC
P214F, P221D, P221F
The GPCM detects a heater short circuit by detecting high current in the heater.
P21DD, P221C, P221E
The GPCM detects a heater open circuit by detecting low current in the heater.
Action Taken When the DTC Sets
DTCs P214F, P21DD, P221C, P221D, P221E and P221F are Type B DTCs.
Conditions for Clearing the DTC
DTCs P214F, P21DD, P221C, P221D, P221E and P221F are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
* Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality) Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality)Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level) Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level)Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control) Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control)Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering) Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering)
* Exhaust Aftertreatment System Description Exhaust Aftertreatment System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Note: Reductant Heater parameters are in the GPCM data list.
1. Ignition ON.
2. Observe the following GPCM control circuit status parameters listed below with a scan tool:
* Reductant Heater 1, 2, or 3 Ctrl Ckt Short Gnd Test Status
* Reductant Heater 1, 2, or 3 Ctrl Ckt Open Test Status
* Reductant Heater 1, 2, or 3 Ctrl Ckt Short Volts Test Status
Each parameter should display OK or Not Run
• If Malfunction is displayed
Refer to Circuit/System Testing
• If OK or Not Run is displayed
3. Command the GPCM Reductant Heater 1, 2, or 3 ON and OFF with a scan tool. Observe the scan tool GPCM Reductant Heater 1, 2, or 3 Current parameter. The reading should be between 5-7 Amps for heater 1, 0.75-2 Amps for heater 2, and 1.5-3 Amps for heater 3.
• If not within the specified range
Refer to Circuit/System Testing
• If within the specified range
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify a DTC does not set.
• If a DTC sets
Refer to Circuit/System Testing for further diagnosis
• If a DTC does not set
6. All OK.
Circuit/System Testing
Note: When testing the low reference circuits, verify all vehicle systems are completely OFF for at least 2 minutes. This includes retained accessory power (RAP) and the scan tool.
Refer to Testing Ground and Low Reference Circuits Testing Ground and Low Reference Circuits for further information on testing the low reference circuits.
1. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down, disconnect the X395 24-way harness connector at the DEF Tank. Refer to Inline Harness Connector End Views X100 for connector identification.
Note: Testing for steps 2-4 is performed on the GPCM side of the harness connector.
2. Test for less than 5 ohms between the appropriate ground circuit listed below and ground.
* DEF heating tank (2) heater ground circuit terminal A4
* DEF pump line heater ground circuit terminal B4
* DEF reservoir heater ground circuit terminal C4
• If 5 ohms or greater
1. Ignition OFF, disconnect the harness connector at the K34 glow plug control module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K34 glow plug control module.
• If less than 5 ohms
3. Connect a test light between the appropriate control circuit listed below and ground, Ignition ON.
4. Verify the test lamp turns ON when commanding the GPCM Reductant Heater 1, 2, or 3 ON with a scan tool.
* DEF heating tank (2) heater control circuit terminal A5
* DEF pump line heater control circuit terminal B5
* DEF reservoir heater control circuit terminal C5
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the K34 glow plug control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K34 glow plug control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K34 glow plug control module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K34 glow plug control module.
• If the test lamp turns ON
Note:
* Testing for the remaining steps are performed on the DEF Tank side of the 24-way harness connector.
* Do not use the ground circuits in the 24-way harness connector.
5. Test for infinite resistance between each terminal listed below and ground.
* DEF heating tank (2) heater control circuit terminal A5
* DEF pump line heater control circuit terminal B5
* DEF reservoir heater control circuit terminal C5
• If less than infinite resistance
Repair the short to ground or short to voltage on the circuit
• If infinite resistance
6. Measure the resistance between the control circuit and ground circuit terminals listed below. The reading should be between 2-4 ohms for the reductant reservoir heater 1, 8-10 ohms for the supply line heater 2, and 3-5 ohms for the reductant pump heater 3.
* DEF heating tank (2) heater control circuit terminal A5 and ground circuit terminal A4
* DEF pump line heater control circuit terminal B5 and ground circuit terminal B4
* DEF reservoir heater control circuit terminal C5 and ground circuit terminal C4
• If not within the specified range
1. Disconnect the harness connector at the appropriate reductant heater.
2. Test for less then 2 ohms in the circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the appropriate reductant heater or emission reduction fluid tank assembly.
• If within the specified range
7. All OK.
Repair Instructions
* Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe Replacement Service and Repair
* Emission Reduction Fluid Tank Replacement Emission Reduction Fluid Tank Replacement
* Perform the scan tool Reductant System Reset procedure after replacing the emission reduction fluid tank.
* Control Module References Control Module References for glow plug control module replacement, programming, and setup
Repair Verification
1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
Note:
* The diesel exhaust fluid (DEF) and ambient air temperatures must be greater than -7°C (19°F) before proceeding with this procedure.
* Exhaust Gas Temperature (EGT) sensor 2 must be less than 200°C (392°F) prior to running the Reductant System Leak Test.
5. Ignition ON, command the Reductant System Leak Test ON with a scan tool. Allow the pressure to build for at least 2 minutes. Observe the scan tool Reductant Pressure sensor parameter. The reading should be between 400-83 kPa and there should be no leaks in the system.
6. Perform the Reductant System Malfunction Warning Test Component Tests and General Diagnostics with a scan tool in order to clear the Service Emission System message, if illuminated.
• If the Service Emission System message does not turn OFF, a condition with the system still exists.