U0653: Lost Communication With EGR Sensor C

What it means

A control module has stopped receiving expected network messages from EGR sensor C. The sensor's function and the effect on EGR operation depend on the vehicle's system design.

At a glance

• Usually lights the warning light of the system that lost communication
• Affects emissions; the car can fail an emissions test

How it works

EGR sensor C sends a measurement used by the exhaust-gas recirculation system; the sensor's specific role depends on the vehicle. This code sets when a module stops receiving the expected messages from sensor C, so its EGR feedback may be unavailable.

Common causes

Most likely first.

1. Bus wiring open or shorted
2. Module without power or ground
3. Module failed

Symptoms

• Warning light or message related to the affected system
• EGR operation may be affected

How to diagnose it

1. Record freeze-frame data and scan all modules for EGR and communication codes to determine when sensor C messages were lost.
2. Check live data specifically for the sensor C reading and confirm whether it updates during commanded EGR operation.
3. Inspect EGR sensor C's connector and network wiring for looseness, corrosion, heat damage, or chafing.
4. Check power and ground at sensor C or its associated module according to the manufacturer's wiring information.
5. Test the network circuit serving sensor C for opens or shorts, then evaluate sensor C or its module if wiring and feeds pass.

Common fixes

• Reconnect or clean the EGR sensor C connector.
• Repair damaged network wiring or connector terminals serving sensor C.
• Restore the sensor module's power or ground.
• Replace EGR sensor C or its module if the circuits pass but communication remains absent.

Can I keep driving?

If the engine runs normally, a short trip may be possible, but avoid heavy loads if power or smoothness worsens. Lost EGR feedback can increase emissions or affect engine performance.