C1857 Chevrolet Monte Carlo OBD Code

OBD/2 C1857 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 C1857 as an indication of a hard fault.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

C1857 Chevrolet Monte Carlo Error Code Repair Process :

If your knock sensor 2 circuit malfunction (bank 2) 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 C1857 and engine control unit are in charge of monitoring a bunch of different knock sensor 2 circuit malfunction (bank 2), and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Chevrolet Monte Carlo C1857 OBD2 Code

A common cause of code C1857 is the failure of Knock Sensor 2 Circuit Malfunction (Bank 2), but there are several other possible causes as well, such as ;

Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
Engine Control Module (ECM)
Exhaust tube
Incorrect fuel filler cap used

C1857 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

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

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C1857 Chevrolet Monte Carlo OBD Code

C1857 Chevrolet Monte Carlo Error Code Repair Process :

Common Causes of Chevrolet Monte Carlo C1857 OBD2 Code

C1857 code for other Chevrolet cars