U0652

Lost Communication With EGR Sensor B

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
Unstable idling
Possible detonation knocks

Causes

Open or short circuit in the EGR sensor circuit
Malfunction of the EGR B sensor itself
Poor contact in the sensor connector
Problems with power supply or sensor ground
ECU malfunction (rare)

How to Fix

Check the integrity of the wiring harness to the EGR B sensor
Check the supply voltage and ground of the sensor
Inspect the sensor connector for oxidation or damage.
Check the sensor resistance (compare with the nominal value)
If necessary, replace EGR sensor B

Related codes

U0401 U0402 P0400