PowertrainP21DD
CautionSeverity: Caution - get it checked when you can
Reductant heater 'A' current too low
Key terms: Control module: a small computer that runs one part of the car · 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 12
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P21DD | No description available | Powertrain |
| Daewoo | P21DD | No description available | Powertrain |
| EOBD | P21DD | Reductant heater 'A' current too low Brand | Powertrain |
| GM | P21DD | No description available | Powertrain |
| Holden | P21DD | Reductant Tank Heater 1 Low Current Brand | Powertrain |
| Isuzu | P21DD | No description available | Powertrain |
| Land Rover | P21DD | Reductant Heater 'A' Current Too Low Brand | Powertrain |
| Maserati | P21DD | Reductant Heater 1 Current Too Low Brand | Powertrain |
| Opel | P21DD | No description available | Powertrain |
| Peugeot | P21DD | No description available | Powertrain |
| Saab | P21DD | No description available | Powertrain |
| Toyota | P21DD | Reductant heater 'A' current too low 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.
5Extended variant codes 2
These 7-character codes are manufacturer-specific variants of P21DD and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P21DD00 | 6141,501,S_VP_CFB_RAG_HEAT_L_1: _ Symptom-Name: VP_CFB_RAG_HEAT_L Brand | Powertrain |
| Sprinter | P21DD00 | 6141,501,S_VP_CFB_RAG_HEAT_L_1: _ Symptom-Name: VP_CFB_RAG_HEAT_L Brand | Powertrain |
6Related codes
Browse Pxxx codes or P21Dxx codes.