Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2002LEGACY GT WAGON AWD F4-2.5L SOHCREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSDTC 21CRUISE CONTROL SYSTEM
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHC
Cruise Control System
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHCSECTION Cruise Control System
DTC 21, 24, 25 AND 2A CRUISE CONTROL MODULE BUILT-IN RELAY, CPU RAM
DIAGNOSIS:
- Poor welding of built-in relay of cruise control module.
- Failure of built-in CPU RAM of cruise control module.
TROUBLE SYMPTOM:
- Cruise control is canceled and memorized cruise speed is also canceled.
- Once the cruise control is canceled, the cruise control cannot be set until the ignition switch and cruise control main switch turns OFF, and then turns ON again.
NOTE: Check the input/output signal and vehicle speed signal with select monitor. When the signals are in good condition, failure is in cruise control module. (Check power supply and ground conditions of cruise control module.)
DIAGNOSIS:
- Poor welding of built-in relay of cruise control module.
- Failure of built-in CPU RAM of cruise control module.
TROUBLE SYMPTOM:
- Cruise control is canceled and memorized cruise speed is also canceled.
- Once the cruise control is canceled, the cruise control cannot be set until the ignition switch and cruise control main switch turns OFF, and then turns ON again.
NOTE: Check the input/output signal and vehicle speed signal with select monitor. When the signals are in good condition, failure is in cruise control module. (Check power supply and ground conditions of cruise control module.)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.