The customer reported that the check engine light was illuminated. A scan tool was utilized, revealing a code P0400-00. Live data monitoring during a test drive confirmed that the EGR valve was not functioning properly and it showed no visible faults.

Vehicle

2021 Opel Vauxhall Movano 2.3L Diesel

Title

P0400-00, Replaced Exhaust Gas Recirculation Valve

Complaint

The customer states that the check engine light is on

Cause

Confirmed the customer’s complaint regarding the check engine light being on. Connected a scan tool and identified code P0400-00, indicating an issue with the Exhaust Gas Recirculation (EGR) Valve “A” Flow. During a test drive, monitored live data using the scan tool, revealing that the exhaust gas recirculation valve parameter was not within specified limits. With the key on and the engine off, commanded the exhaust gas recirculation valve using the scan tool, but observed that the valve was not functioning properly. Conducted a visual inspection of the exhaust gas recirculation valve, detecting no visible faults. Inspected the exhaust gas recirculation valve sensor wiring harness and connectors, confirming there were no loose connections or signs of damage. Used a multi-meter to check for the presence of voltage at the exhaust gas recirculation valve with the key on and engine off, confirming the presence of voltage. Additionally, checked the exhaust gas recirculation valve wiring harness for any shorts or opens using the multi-meter, finding none. Removed the exhaust gas recirculation valve and employed a set of fused jumper wires to apply voltage and ground repeatedly to the valve, determining that the valve did not operate as expected. These comprehensive tests confirmed that the exhaust gas recirculation valve was faulty.

Correction

Replaced the exhaust gas recirculation valve, cleared codes, reset parameters, performed a road test, and verified that the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.