PowertrainP20B9
CautionSeverity: Caution - get it checked when you can
Reductant Heater A Control Circuit/Open
Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 26
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| BAIC Motor | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Mercedes-Benz | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| BYD | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Chery | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Daewoo | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| DFFS | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| DFFX | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| DFXK | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| EOBD | P20B9 | Reduktantvarmer 'A' styringskrets/åpen Brand | Powertrain |
| Geely | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| GM | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Great Wall | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Hafei | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Holden | P20B9 | Reductant Heater 1 Control Circuit Brand | Powertrain |
| Hyundai | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| Isuzu | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| Land Rover | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| Maserati | P20B9 | Reductant Suction Line Heater Control Circuit/Open Brand | Powertrain |
| Mitsubishi | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| Opel | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Peugeot | P20B9 | Reductant Heater A Control Circuit/Open SAE | Powertrain |
| Saab | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| MG (SAIC) | P20B9 | Reductant Heater 'A' Control Circuit/Open Brand | Powertrain |
| Toyota | P20B9 | Reductant heater 'A' control circuit/open Brand | Powertrain |
| Volkswagen | P20B9 | Control circuit for reductant heating 1: open circuit; Upper limit exceeded Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Related codes
Browse Pxxx codes or P20Bxx codes.