What to do if your Def heater has a p20ba fault?
If these codes are present, diagnose them before attempting to diagnose the P20BA. If the P20BA is the only active fault code present, and there are no updates/TSBs for your particular vehicle, then the next step is to locate the DEF Supply Line Heater, which is close to the DEF Supply Pump on the DEF tank.
What is code p20b9 Def supply line heater?
With the scan tool hooked up, see if code P20B9 DEF Supply Line Heater Circuit High Input is now active after 15 seconds. If this happens, then the wiring, DEF control unit/module and PCM are good. The most likely problem is the DEF Supply Line Heater.
How to diagnose a p20ba pump fault?
Diagnose current faults first, in the order in which they are stored. Misdiagnosis occurs when this code is diagnosed when it is a stored code, especially while other codes are active. Also, check for active DEF Tank Heater and DEF Supply Pump fault codes. If these codes are present, diagnose them before attempting to diagnose the P20BA.
What does code p20ba mean on a PCM?
What Does Code P20BA Mean? The reductant heater control system is used by the Powertrain Control Module (PCM) to heat up the Diesel Exhaust Fluid (DEF) to prevent it from freezing. Diesel exhaust fluid is sprayed inside the catalytic converter to reduce NOx emissions.
If these codes are present, diagnose them before attempting to diagnose the P20BA. If the P20BA is the only active fault code present, and there are no updates/TSBs for your particular vehicle, then the next step is to locate the DEF Supply Line Heater, which is close to the DEF Supply Pump on the DEF tank.
With the scan tool hooked up, see if code P20B9 DEF Supply Line Heater Circuit High Input is now active after 15 seconds. If this happens, then the wiring, DEF control unit/module and PCM are good. The most likely problem is the DEF Supply Line Heater.
Diagnose current faults first, in the order in which they are stored. Misdiagnosis occurs when this code is diagnosed when it is a stored code, especially while other codes are active. Also, check for active DEF Tank Heater and DEF Supply Pump fault codes. If these codes are present, diagnose them before attempting to diagnose the P20BA.
When does the PCM turn on the Def heater?
It also determines when the heaters are turned on for both the tank and for the supply line. In either heater’s case, as the temperature of the DEF falls below the 32 degree mark, the PCM will have the control module operate the various DEF system heaters.