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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSABS - CODE 65 MISDIAGNOSIS
1990 Chevrolet Lumina APV V6-191 3.1L
ABS - Code 65 Misdiagnosis
1990 Chevrolet Lumina APV V6-191 3.1LSECTION ABS - Code 65 Misdiagnosis
89Chevy27
GMC NUMBER: 90-5E-06
GROUP: 5E - Anti-Lock Brakes
DATE: October, 1989
CORPORATE
NUMBER: 965012
SUBJECT: FOUR WHEEL ANIT-LOCK (4WAL) CODE 65 MISDIAGNOSIS
MODELS: 1990 M/L VANS
The instrument panel (I.P.) anti-lock warning light will only come on when an abnormal condition exists within the 4WAL system. It should be noted that if the I.P. antilock warning light is not on, it can accidentally be turned on and remain on by grounding diagnostic terminal "H" to "A" twice within ten seconds. If this occurs, and Code 65 is
read out using the diagnostic procedure, then this code was probably set by the technician. This is a pecularity within the 4WAL system, and should not be interpreted as a faulty condition. Technicians who have accidentally induced a Code 65 in this manner should simply dear the code prior to returning the vehicle to the customer.
GMC NUMBER: 90-5E-06
GROUP: 5E - Anti-Lock Brakes
DATE: October, 1989
CORPORATE
NUMBER: 965012
SUBJECT: FOUR WHEEL ANIT-LOCK (4WAL) CODE 65 MISDIAGNOSIS
MODELS: 1990 M/L VANS
The instrument panel (I.P.) anti-lock warning light will only come on when an abnormal condition exists within the 4WAL system. It should be noted that if the I.P. antilock warning light is not on, it can accidentally be turned on and remain on by grounding diagnostic terminal "H" to "A" twice within ten seconds. If this occurs, and Code 65 is
read out using the diagnostic procedure, then this code was probably set by the technician. This is a pecularity within the 4WAL system, and should not be interpreted as a faulty condition. Technicians who have accidentally induced a Code 65 in this manner should simply dear the code prior to returning the vehicle to the customer.
RENDER: 1.0x
NO RELATED
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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.