garajizOBD-II code · generic
P21DD
Reductant Heater A Current Too Low
- System
- P2 — Powertrain / emissions (generic)
- Severity
- Moderate (3/5)
- Can I keep driving?
- Drive with caution
What does P21DD mean?
P21DD is defined as “Reductant Heater A Current Too Low”.
Drive gently and only as far as you need to; have it checked as soon as possible.
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This page is general information; an exact diagnosis needs measurements and a technician’s check.