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C1095 OBD-II Trouble Code: ABS Hydraulic Pump Motor Circuit Failure

check engine light

C1095 code definition

The C1095 code is a manufacturer-specific chassis code. In this case, it means the ABS hydraulic pump motor circuit has failed.

Codes related to the C1095 include:

  • C1096: ABS Hydraulic Pump Motor Circuit Open
  • C1097: ABS Hydraulic Pump Motor Circuit Short To Ground
  • C1098: ABS Hydraulic Pump Motor Circuit Short To Battery
  • C1100: ABS Pump Switch Circuit Failure
  • C1101: ABS Hydraulic Valve Circuit Failure
  • C1102: ABS Acceleration Switch Circuit Failure
  • C1103: ABS Hydraulic Brake Switch Circuit Failure
  • C1238: ABS Hydraulic Pressure Differential Switch Input Circuit Failure
  • C1239: ABS Hydraulic Pressure Differential Switch Input Open Circuit
  • C1240: ABS Hydraulic Pressure Differential Switch Input Short Circuit To Battery
  • C1241: ABS Hydraulic Pressure Differential Switch Input Short Circuit To Ground

What the C1095 code means

A code C1095 will be stored when the ABS hydraulic pump motor circuit fails.

A vehicle’s ABS control module is sent wheel speed readings from each wheel speed sensor, using the data to determine if an ABS event is necessary. A wheel speed sensor electrically senses every tooth of an ABS sensor indicator as it passes through the wheel speed sensor's magnetic field.

An ABS control module continuously monitors and compares the rotational speed of each wheel. When the module detects an impending wheel lock, it modulates brake pressure to the appropriate brake caliper. This is done by triggering the hydraulic control unit to open and close necessary solenoid valves. Once the affected wheel returns to normal speed, the ABS control module returns the solenoid valves to their normal position and normal braking patterns resume.

Also, the ABS control module is self-monitoring so when a vehicle’s ignition switch is in the RUN position, the ABS control module does a preliminary electrical check and at approximately 12 mph the pump motor is turned on for approximately a half second. Any malfunction of the ABS system will cause the ABS to shut off however, normal power assisted braking is maintained.

What causes the C1095 code?

Several problems may cause a C1095 code including:

  • Damaged or defective ABS hydraulic pump
  • Damaged or defective wheel speed sensor(s)
  • Damaged or defective wheel bearings
  • Damaged, corroded, open, or shorted electrical wiring and related connectors
  • Low brake fluid
  • Blown or damaged fuses
  • Damaged or defective ABS warning indicator lamp

What are the symptoms of the C1095 code?

Symptoms of a C1095 code may include: * Check engine light may illuminate * ABS Light may illuminate * ABS system may not work

How does a mechanic diagnose the C1095 code?

A mechanic may use several methods to diagnose a C1095 trouble code, including: * Utilize an OBD-II scanner to check for a stored C1095 trouble code * Check brake fluid levels and compare against manufacturer specifications for the particular vehicle make and model * Visually inspect electrical wiring and related connectors for corrosion, damage, or shorts * Check the suspect wheel circuit for a short to power * Check the suspect wheel circuit for a short to ground * Check the suspect wheel speed sensor for a short to ground * Check the wheel speed circuit for open or short together * Check the wheel speed sensor for an open or short together * Check for continuous operation of the ABS Pump Motor * Check the battery junction box * Check for open circuits

How serious is the C1095 code?

Because a vehicle’s safe driving operation will not likely be impacted due to faults that store a C1095 code, this code is not considered a potentially serious code. However, because your vehicle’s ABS system may not work, when this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the C1095 code?

Several repairs can fix a C1095 trouble code and include:

  • Repair electrical wiring and related connectors
  • Fill brake fluid to manufacturer recommended levels
  • Replace damaged or defective wheel speed sensor(s)
  • Install a new hydraulic pump unit (HCU)
  • Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Need help with a C1095 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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