P056D
Reductant Control Module System Voltage
P056D is an OBD-II diagnostic trouble code meaning: Reductant Control Module System Voltage. Common causes: battery or alternator problems, open or short circuit in module wiring harness. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- Possible SCR error messages on the dashboard
Causes
- Battery or alternator problems
- Open or short circuit in module wiring harness
- Faulty connections or corroded connectors
- Reagent control module failure
- Problems with the relay or circuit fuse
How to Fix
- Check battery voltage and generator operation
- Visually inspect the wiring harness and module connectors for damage
- Check the fuse and relay of the module power supply circuit
- Measure the voltage at the module terminals with the ignition on
- If necessary, replace the reagent control module
Related codes
Error P056D by Vehicle Brand
FAQ
What does the P056D code mean?
P056D is an OBD-II diagnostic trouble code that indicates: Reductant Control Module System Voltage
What causes a P056D error code?
The most common causes of P056D include: Battery or alternator problems; Open or short circuit in module wiring harness; Faulty connections or corroded connectors; Reagent control module failure.
How do I fix a P056D diagnostic trouble code?
To fix P056D: Check battery voltage and generator operation. Visually inspect the wiring harness and module connectors for damage. Check the fuse and relay of the module power supply circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P056D?
Limited driving only, diagnose soon
How much does it cost to fix P056D?
The estimated repair cost for P056D is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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