garajizOBD-II code · generic
P21CB
Reductant Control Module Supply Voltage Low
- System
- P2 — Powertrain / emissions (generic)
- Severity
- Moderate (3/5)
- Can I keep driving?
- Drive with caution
What does P21CB mean?
P21CB is defined as “Reductant Control Module Supply Voltage Low”.
Drive gently and only as far as you need to; have it checked as soon as possible.
Related codes
- P21CAReductant Control Module Supply Voltage Circuit
- P21CCReductant Control Module Supply Voltage High
- P21C9Reductant Control Module Power Relay/Relays Control Circuit High
- P21CDReductant Quality Module Supply Voltage Low
- P21C8Reductant Control Module Power Relay/Relays Control Circuit Low
- P21CEReductant Quality Module Performance
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This page is general information; an exact diagnosis needs measurements and a technician’s check.