P143A
Reductant Control System Diagnostic Signal Message Counter Incorrect
P143A is an OBD-II diagnostic trouble code meaning: Reductant Control System Diagnostic Signal Message Counter Incorrect. Common causes: malfunction of the reductant system control module, problems with system wiring or connectors. Estimated repair cost: $28–167.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- AdBlue system error message on the dashboard
- Problems with the exhaust gas cleaning system
Causes
- Malfunction of the reductant system control module
- Problems with system wiring or connectors
- Failures in ECU software
- AdBlue system sensor malfunction
- Problems with communication between modules (CAN bus)
How to Fix
- Diagnose the AdBlue system using a scanner
- Check the integrity of the system wiring and connectors
- Update ECU software
- Check and, if necessary, replace reagent system sensors
- If necessary, replace the reductant system control module
Related codes
FAQ
What does the P143A code mean?
P143A is an OBD-II diagnostic trouble code that indicates: Reductant Control System Diagnostic Signal Message Counter Incorrect
What causes a P143A error code?
The most common causes of P143A include: Malfunction of the reductant system control module; Problems with system wiring or connectors; Failures in ECU software; AdBlue system sensor malfunction.
How do I fix a P143A diagnostic trouble code?
To fix P143A: Diagnose the AdBlue system using a scanner. Check the integrity of the system wiring and connectors. Update ECU software. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P143A?
Yes, but get it checked soon
How much does it cost to fix P143A?
The estimated repair cost for P143A is $28–167. Actual cost depends on your vehicle, location, and labor rates.
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