What are the common causes of P208B?

A reductant pump A that will not turn on. An open in the pump A control circuit. A failed reductant pump A. A clogged pump A inlet screen.

Command reductant pump A with a scan tool. Test the pump A control circuit for an open. Read the pump A current and pressure output. Inspect the pump A inlet screen for a clog. Replace the reductant pump A if it will not run. Clear the code and retest.

P208B

Reductant Pump A Control Performance/Stuck Off

System: Fuel and air metering (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P208B means Reductant Pump A Control Performance/Stuck Off.

Where it lives

For P208B, the description names the pump as the part involved.

Check these first

A reductant pump A that will not turn on
An open in the pump A control circuit
A failed reductant pump A
A clogged pump A inlet screen

What to do next

Command reductant pump A with a scan tool
Test the pump A control circuit for an open
Read the pump A current and pressure output
Inspect the pump A inlet screen for a clog
Replace the reductant pump A if it will not run
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.