C0090 high Severity

C0090: Right Rear ABS Solenoid #1 Circuit Malfunction

ABS warning light on, potential compromised braking performance and stability control functionality

Overview

C0090 diagnostic trouble code refers to a malfunction in the right rear ABS solenoid #1 circuit, typically indicating electrical faults such as open/short circuits, poor connections, or faulty ABS solenoid within the anti-lock braking system

Common Symptoms

  • ABS warning light illuminated
  • Traction control warning light illuminated
  • Increased braking distances under ABS activation
  • Unusual braking behavior such as pulsating brake pedal
  • Intermittent stability control faults

Most Common Causes

Faulty right rear ABS solenoid #1 high

Internal valve or coil failure in ABS solenoid assembly

Damaged wiring harness or connector in ABS solenoid circuit high

Open/short circuits or corroded connectors disrupting solenoid signals

Poor ground or power supply to ABS solenoid circuit medium

Weak ground or voltage drop affecting solenoid operation

Faulty Electronic Brake Control Module (EBCM) medium

Internal ABS control module malfunction affecting solenoid control

Wheel speed sensor anomaly triggering related ABS fault low

May coincide with sensor issues causing misinterpretation of circuit state

Diagnostic Steps

  1. Connect OBD-II scanner and confirm C0090 and any related ABS codes
    Expected: Presence of C0090 with or without associated ABS codes
    Interpretation: Confirms the ABS solenoid circuit malfunction before further testing
  2. Visually inspect wiring and connector to right rear ABS solenoid
    Expected: No broken wires, no corrosion, no loose pins
    Interpretation: Damage indicates likely electrical fault causing the DTC
  3. Measure voltage and ground at the ABS solenoid circuit connector with ignition ON
    Expected: Approximately 12V at power and solid ground
    Interpretation: Absence suggests harness or power supply issue
  4. Test resistance of the ABS solenoid coil using a multimeter
    Expected: Resistance within manufacturer specification
    Interpretation: Out-of-spec indicates solenoid internal failure
  5. Clear codes and perform a road test with live data monitoring
    Expected: ABS system operates normally without retriggering C0090
    Interpretation: Validates repair effectiveness

Repair Solutions

Replace right rear ABS solenoid #1 medium
Estimated Cost: $150 - $400

Part and labor cost vary by vehicle; ensure proper bleeding of ABS system after replacement

Repair or replace damaged wiring/connector in ABS solenoid circuit medium
Estimated Cost: $50 - $200

Cleaning terminals and fixing harness often resolves intermittent faults

Replace Electronic Brake Control Module (EBCM) if faulty hard
Estimated Cost: $500 - $1200

Requires module programming and calibration

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Misinterpretation as generic chassis or stability control fault
  • Incorrect diagnosis as wheel speed sensor failure without verifying ABS solenoid circuit
  • Attributing symptoms to brake pads or hydraulic issues rather than electrical circuit faults

Frequently Asked Questions

What is the definition of the C0090 engine code?

When your OBD-II scanner reads C0090, it means: Right Rear ABS Solenoid #1 Circuit Malfunction. This code is related to the vehicle's Sensors.

Should I stop driving if I have C0090?

With a severity level of high, aBS warning light on, potential compromised braking performance and stability control functionality

How do I know if I have code C0090?

You may experience the following: ABS warning light illuminated, Traction control warning light illuminated, Increased braking distances under ABS activation.

Potential causes for OBDII code C0090

Potential culprits include: Faulty right rear ABS solenoid #1, Damaged wiring harness or connector in ABS solenoid circuit, Poor ground or power supply to ABS solenoid circuit. A proper diagnosis is recommended.

How much does it cost to fix C0090?

Repair costs depend on the specific failure. A simple Repair or replace damaged wiring/connector in ABS solenoid circuit replacement is relatively affordable ($50-$200), whereas a Replace Electronic Brake Control Module (EBCM) if faulty repair is more expensive, potentially reaching $1200.

Is the C0090 code specific to Dodge?

Yes, C0090 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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