P23A3

Exhaust Heat Exchanger Exhaust Bypass Valve B Control 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
Deterioration in fuel consumption
Unstable engine operation at idle
Increased emissions of harmful substances

Causes

Open or short circuit in valve control circuit
Heat exchanger bypass valve malfunction
Problems with the relay or circuit fuse
Poor contact in circuit connectors
Engine control unit (ECU) malfunction

How to Fix

Check valve control circuit integrity
Check valve resistance and operation
Inspect connectors and contacts for corrosion
Check circuit fuses and relays
If necessary, replace the heat exchanger bypass valve

Related codes

P23A0 P23A1 P23A2