Diagnostic Aids

For symptom byte 21, the front and rear parking assist control module only runs the diagnostic when the vehicle is driven greater than 40 km/h (25 MPH). When diagnosing symptom byte 21, the vehicle must be driven greater than 40 km/h (25 MPH) after a repair to verify the concern has been corrected.

The following is a list of reasons this symptom byte 21 might have set:

• One or more of the sensors may be blocked by snow, mud, ice or debris. This condition may occur after going through a car wash in cold weather.
• One or more of the sensors may be scratched or the paint maybe chipped.
• Excessive paint thickness on a sensor may cause an excessive sensor ring time. When replacing or refinishing a sensor, do not apply an excessive amount of paint or clear coat.
• The silicone insulator (ring) surrounding sensor maybe missing, cut or twisted.
• The sensor may be improperly installed and not fully seated or the sensor may be misaligned due to a tight wiring harness.