U1940 Citroen Ds OBD Code

OBD/2 U1940 error code description and symptoms.

Brake Switch Circuit Input Malfunction Indicates PCM did not receive a brake pedal position (BPP) input. Open or short in BPP circuit Open or short in stoplamp circuits Damaged PCM Malfunction in module(s) connected to BPP circuit. (Rear Electronic Module [REM] Windstar and LS6/LS8 or Lighting Control Module (LCM) Continental and Town Car. Damaged brake switch Misadjusted brake switch Check for proper function of stoplamps.

At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.

U1940 Citroen Ds Error Code Repair Process :

If your seatbelt passenger pretensioner circuit short to ground 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 U1940 and engine control unit are in charge of monitoring a bunch of different seatbelt passenger pretensioner circuit short to ground, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Citroen Ds U1940 OBD2 Code

A common cause of code U1940 is the failure of Seatbelt Passenger Pretensioner Circuit Short to Ground, but there are several other possible causes as well, such as ;

Failures of clutch motion/travel sensors.
Erratic camshaft position due to low oil pressure
Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
Faulty front heated oxygen sensor

U1940 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.

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U1940 Citroen Ds OBD Code

U1940 Citroen Ds Error Code Repair Process :

Common Causes of Citroen Ds U1940 OBD2 Code

U1940 code for other Citroen cars