ABS Isolation Valve Solenoid Circuit
1995-2005 Pontiac Sunfire 2.2L I4
Description
Malfunction in the ABS isolation valve solenoid, used to isolate the master cylinder from the ABS modulator.
Symptoms
- ABS light on
- Brake pedal feels unusual
- ABS not functioning
- Pedal sinks during ABS activation
Common Causes
- Isolation valve solenoid failure
- ABS module internal fault
- Wiring open or short
- Contaminated brake fluid
Diagnostic Steps
- Test solenoid resistance through connector
- Command isolation valve with scan tool
- Check brake fluid condition
- Inspect module connector pins
Repair Notes
Replace ABS modulator assembly. Bleed brake system thoroughly.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0026RF Wheel Speed Sensor Circuit Intermittent
- C0027LR Wheel Speed Sensor Circuit Intermittent
- C0028RR Wheel Speed Sensor Circuit Intermittent
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Front Wheel Speed Signal Erratic
C0059 on Other Vehicles
Pontiac Aztek
2001-2005 3.4L V6
Pontiac Bonneville
1990-1999 3.8L V6
Pontiac Bonneville
2000-2005 3.8L V6
Pontiac Bonneville GXP
2000-2005 4.6L V8
Pontiac Bonneville GXP
2000-2005 4.6L V8 Northstar
Pontiac Bonneville SSEi
1992-1999 3.8L Supercharged V6
Pontiac Bonneville SSEi
1992-1999 3.8L V6 Supercharged
Pontiac Firebird
1993-1997 3.4L V6
Common Questions
What does code C0059 mean on a 1995-2005 Pontiac Sunfire?
C0059 stands for "ABS Isolation Valve Solenoid Circuit". Malfunction in the ABS isolation valve solenoid, used to isolate the master cylinder from the ABS modulator.
What are the symptoms of C0059 on a Pontiac Sunfire?
Common symptoms of C0059 include: ABS light on, Brake pedal feels unusual, ABS not functioning, Pedal sinks during ABS activation.
What causes C0059 on a 1995-2005 Pontiac Sunfire?
Common causes of C0059 include: Isolation valve solenoid failure, ABS module internal fault, Wiring open or short, Contaminated brake fluid.