garajizOBD-II code · generic
P20B4
Reductant Heater Coolant Control Valve Circuit High
- System
- P2 — Powertrain / emissions (generic)
- Severity
- Moderate (3/5)
- Can I keep driving?
- Drive with caution
What does P20B4 mean?
P20B4 is defined as “Reductant Heater Coolant Control Valve Circuit High”.
Drive gently and only as far as you need to; have it checked as soon as possible.
Related codes
- P20B3Reductant Heater Coolant Control Valve Circuit Low
- P20B5Reductant Metering Unit Heater Control Circuit/Open
- P20B2Reductant Heater Coolant Control Valve Performance/Stuck Open
- P20B6Reductant Metering Unit Heater Control Circuit Performance
- P20B1Reductant Heater Coolant Control Valve Circuit/Open
- P20B7Reductant Metering Unit Heater Control Circuit Low
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This page is general information; an exact diagnosis needs measurements and a technician’s check.