Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If the P204A DTC is also active, diagnose and repair that DTC before continuing with this test procedure.
1. Turn the ignition on for one minute, engine not running.
2. With the scan tool check for active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION - 6.7L. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK FOR HIGH RESISTANCE IN THE DEF TANK LEVEL SENSOR 5-VOLT SUPPLY CIRCUIT
1. Turn ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Turn ignition on.
4. Measure the voltage at the DEF Tank Level Sensor 5-Volt Supply circuit at the DEF Supply Pump Assembly harness connector.
  Is the voltage reading between 4.8 and 5.2 volts?
  
  Yes
  - Go To 3
  No
  - Repair the DEF Tank Level Sensor 5-Volt Supply circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE DEF TANK LEVEL SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn ignition off.
2. Disconnect the DEF Dosing Control Unit C2 harness connector.
3. Measure the resistance of the DEF Tank Level Sensor Signal circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the DEF Tank Level Sensor Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE DEF TANK LEVEL SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the DEF Tank Level Sensor Return circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the DEF Tank Level Sensor Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
DEF LEVEL SENSOR
1. Connect a jumper between the DEF Tank Level Sensor Signal circuit and the DEF Tank Level Sensor Return circuit at the DEF Supply Pump Assembly harness connector.
2. Turn the ignition on, engine not running.
3. With the scan tool check for DTCs.
4. Monitor the scan tool for one minute.
  Did DTC P203C set as active or pending with the jumper in place?
  
  Yes
  - Replace the DEF Supply Pump Assembly in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Replace the DEF Dosing Control Unit in accordance with the service information. Refer to UNIT, DIESEL EXHAUST FLUID DOSING CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .