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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBUICK1990REGAL CUSTOM, 3.8 L, 4T60/ME9REPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGCODE A004, ENABLE RELAY OR SOLENOID FAULT DETECTED
1990 Buick Regal Custom, 3.8 L, 4T60/ME9
Code A004, Enable Relay Or Solenoid Fault Detected
1990 Buick Regal Custom, 3.8 L, 4T60/ME9SECTION Code A004, Enable Relay Or Solenoid Fault Detected
The anti-lock brake controller uses Code A004, as a pretest, to detect malfunction in solenoid or enable relay circuits. Code A004 should always be set with another code; this other code is the one identifying the malfunction.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Code(s) determines what the malfunction is.
- If code A004 is the only code set, an internal malfunction exists in the anti-lock brake controller.
NOTE:
INTERMITTENTS is located under DIAGNOSIS & TESTING.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.