U203D Volvo 240 OBD Code

OBD/2 U203D 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 U203D as an indication of a hard fault.

Circuit High Input codes like U203D are mostly caused by defective alternators that develop excessive voltages, although there may be other causes as well, such as short circuits that 'leak' current into a particular system from other, unrelated systems that work on higher voltages. Note that in the case of short circuits that leak power into a control circuit, there is likely to be other, seemingly unrelated trouble codes present along with the code(s) being investigated. Diagnosing a 'high input' code will always involve a thorough testing of the charging system as a first step, followed by measures to isolate the system from all other possible sources of power during resistance, continuity, and reference voltage tests.

U203D Volvo 240 Error Code Repair Process :

If your heated wind shield relay short to vbatt (changed from failure 2/6/97) 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 U203D and engine control unit are in charge of monitoring a bunch of different heated wind shield relay short to vbatt (changed from failure 2/6/97), and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Volvo 240 U203D OBD2 Code

A common cause of code U203D is the failure of Heated Wind Shield Relay Short to Vbatt (changed from Failure 2/6/97), but there are several other possible causes as well, such as ;

Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection
Erratic camshaft position due to low oil pressure
Dirty Oil
Engine Control Module (ECM)

U203D 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.

U203D Volvo 240 OBD Code

U203D Volvo 240 Error Code Repair Process :

Common Causes of Volvo 240 U203D OBD2 Code

U203D code for other Volvo cars