P237C

Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine Light Is On
Deterioration of interior heating in cold weather
Increased fuel consumption
Unstable engine operation at idle
Possible errors in temperature sensors

Causes

Open or short circuit in valve control circuit
Heat exchanger bypass valve malfunction
Problems with the relay or circuit fuse
Corrosion of contacts or connectors
Engine control unit malfunction

How to Fix

Check the fuse and relay of the corresponding circuit
Inspect the wiring harness and connectors for damage.
Check valve coil resistance
Check valve operation when power is applied
If necessary, replace the bypass valve

Related codes

P237D P237B P237A