Citroen 11+L P21A6 Code:

OBD-II Diagnostic Powertrain (P) Trouble Code

Trouble In Citroen 11+L P21A6 Possible Cause

The most common cause for this Citroen 11+L P21A6 type of failure is due to liquids spilled on the upshift/downshift switch. Open or shorted electrical wiring, damaged, corroded, or disconnected wiring or connectors are also a viable possibility.

Common Symptoms For Citroen 11+L P21A6

  1. OBD-II equipped vehicles utilize a sophisticated computerized control system that calculates various engine drivability inputs with vehicle speed inputs, engine/turbine speed inputs, and transmission output speed inputs to determine the desired degree of high pressure transmission fluid necessary to achieve maximum fuel efficiency, to optimize engine performance, and provide the greatest engine and transmission longevity
  2. Test the wiring and connectors at the fuel shutoff valve to make sure that voltage and ground readings are near battery voltage
  3. Several tools will be instrumental in successfully diagnosing this code
  4. The sensor is of the electro magnetic design and uses a reluctor ring (or a specialized set of splines) on the input shaft as reference points

Similar Problems

Transmission
BBV Sensor Circuit Low Voltage
Cruise Inhibit Control Circuit

Citroen 11+L P21A6 Troubleshooting

White smoke means that the fuel that is being injected into the combustion chamber is not being burned properly. The common causes that produce white smoke range from something as simple as low engine compression or water in the fuel to the fuel pump timing being thrown off because something is starving the fuel from getting to the pump in the manner necessary for the pump to time and work correctly. Citroen 11+L P21A6 the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.

How to turn off Citroen 11+L P21A6 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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