U0977 Mercedes S 300 OBD Code

OBD/2 U0977 error code description and symptoms.

EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on.
The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum. Vacuum supply EGR valve stuck closed EGR valve leaks vacuum EGR flow path restricted EGRVR circuit shorted to PWR VREF open to D.P.F. EGR sensor D.P.F. EGR sensor downstream hose off or plugged EGRVR circuit open to PCM VPWR open to EGRVR solenoid D.P.F. EGR sensor hoses both off D.P.F. EGR sensor hoses reversed Damaged EGR orifice tube Damaged EGRVR solenoid Damaged PCM Perform KOER self-test and look for DTC U0977 as an indication of a hard fault.

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code U0977, so consult the manual to locate the brake fluid reservoir. Bear in mind that a low fluid level can set code U0977 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.

U0977 Mercedes S 300 Error Code Repair Process :

If your ivc solenoid circuit malfunction check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system U0977 and engine control unit are in charge of monitoring a bunch of different ivc solenoid circuit malfunction, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Mercedes S 300 U0977 OBD2 Code

A common cause of code U0977 is the failure of IVC Solenoid Circuit Malfunction, but there are several other possible causes as well, such as ;

Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
Exhaust tube
Intake Valve Timing Control Solenoid Valve circuit poor electrical connection
Faulty Mass Air Flow (MAF) sensor

U0977 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

About Us | Contact | Privacy

U0977 Mercedes S 300 OBD Code

U0977 Mercedes S 300 Error Code Repair Process :

Common Causes of Mercedes S 300 U0977 OBD2 Code

U0977 code for other Mercedes cars