P20A8

Reductant Injection Air Pressure Control Valve Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unpleasant exhaust smell
Possible transition to emergency mode

Causes

Air pressure control valve malfunction
Open or short circuit in control circuit
Poor contact in connectors
SCR control unit malfunction
Wiring Harness Problems

How to Fix

Check valve control circuit integrity
Check valve resistance and operation
Inspect connectors and contacts for corrosion
Check voltage at valve connector
If necessary, replace the air pressure control valve

Related codes

P20A9 P20AA P20B0