C1900 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

C1900 Code failures by brands

C1900 FORD, MERCURY, LINCOLN: STEERING CIRCUIT VAPS SHORT TO GROUND

Description of DTC code C1900

Power steering is increasingly used in vehicles. It ensures better ease of parking the vehicle at low speeds and provides assistance at higher speeds for better stability and handling. As the speed of the car increases, less effort and assistance is needed to steer the wheels. Power steering applies more assistance at low speeds when it is most needed and reduces assistance at higher speeds when it is least required.

The Air Suspension Module has a permanent monitoring of the Variable Power Steering Solenoid (VAPS). In the event that erratic operation caused by a short to ground is detected after such checks, DTC C1900 OBD2 will be set.

Symptoms of fault code C1900

  • Check Engine Lamp illuminated.
  • Anti-lock wheel system warning light illuminates.

Causes of OBD2 C1900

The reasons why the C1900 OBDII fault code is set are:

  • Variable Power Steering Solenoid may have wiring deficiencies.
  • Variable-Assist Power Steering (VAPS) Solenoid circuit electrical connections are bad.
  • Variable-Assist Power Steering Solenoid could be defective.
  • The Air Suspension Module could be damaged.

Possible solutions of the DTC code C1900

In order to fix the C1900 OBD2 diagnostic code you must do the following:

  • Consult the Technical Service Bulletins as a first step.
  • Inspect the wiring of the Variable Power Steering Solenoid and verify that it does not present common damages caused by wear or burns. If one of these conditions is found, proceed with corrections.
  • Measure the variable power steering solenoid circuit voltages and solenoid resistance. Compare all values obtained with those indicated in the manufacturer's specifications. If out of range voltages are found, make appropriate repairs.

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