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 MANUALSCHEVROLET1993ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTINOPERATIVE, ERRATIC SPEEDOMETER/SHIFTING/DTCS SET
1993 Chevrolet Astro Van M V6-262 4.3L VIN Z
Inoperative, Erratic Speedometer/Shifting/DTCs Set
1993 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Inoperative, Erratic Speedometer/Shifting/DTCs Set
FILE IN SECTION: 8 - Chassis/Body Electrical
BULLETIN NO.: 46-82-03A
DATE: June, 1995
SUBJECT:
Inoperative or Erratic Speedometer and/or Vehicle Shifts Down Into Second Gear or Will Not Shift Out of Second Gear (Replace Connector C24O)
MODELS:
1993-94 Chevrolet and GMC Truck M/L Vans
with 4L6OE Transmission (RPO M30)
This bulletin being revised to correct the parts information. Please Discard Corporate Bulletin Number 46-82-03 (Section 8 - Chassis/Body Electrical).
CONDITION
Some owners may experience: inoperative or erratic speedometer, which could result in setting a Diagnostic Trouble Code 24 or 72; the vehicle shifting down into second gear, which may set a Diagnostic Trouble Code 24; or the vehicle will not shift out of second gear, which could result in a Diagnostic Trouble Code 72.
CAUSE
Moisture in the instrument panel harness C240 connector.
CORRECTION
This connector is located on the passenger side kick panel (Figure 1). Determine source of moisture and install proper seal to prevent recurrence of moisture intrusion. Replace C240 connector with connectors (P/N 12167122 and 12125675) and terminals (P/N 12045773). Use silicone grease on terminals to prevent corrosion. Proper procedures for replacement of connectors and terminals will be found in M/L Service Manual # NATP-9443, Section 8A-2. Be certain to label wires prior to replacing connectors, to assure proper location in new connectors.
PARTS INFORMATION
P/N Description Qty
12167122 Connector 1
12125675 Connector 1
12045773 Terminal (Package of 10) 1
Parts are currently available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor
Operation Description Labor Time
N6360 I/P Wiring Use Published
and/or Connector - Labor Operation
Repair. Time
N6270 Engine Wiring Use Published
and/or Connector - Labor Operation
Repair Time.
BULLETIN NO.: 46-82-03A
DATE: June, 1995
SUBJECT:
Inoperative or Erratic Speedometer and/or Vehicle Shifts Down Into Second Gear or Will Not Shift Out of Second Gear (Replace Connector C24O)
MODELS:
1993-94 Chevrolet and GMC Truck M/L Vans
with 4L6OE Transmission (RPO M30)
This bulletin being revised to correct the parts information. Please Discard Corporate Bulletin Number 46-82-03 (Section 8 - Chassis/Body Electrical).
CONDITION
Some owners may experience: inoperative or erratic speedometer, which could result in setting a Diagnostic Trouble Code 24 or 72; the vehicle shifting down into second gear, which may set a Diagnostic Trouble Code 24; or the vehicle will not shift out of second gear, which could result in a Diagnostic Trouble Code 72.
CAUSE
Moisture in the instrument panel harness C240 connector.
CORRECTION
This connector is located on the passenger side kick panel (Figure 1). Determine source of moisture and install proper seal to prevent recurrence of moisture intrusion. Replace C240 connector with connectors (P/N 12167122 and 12125675) and terminals (P/N 12045773). Use silicone grease on terminals to prevent corrosion. Proper procedures for replacement of connectors and terminals will be found in M/L Service Manual # NATP-9443, Section 8A-2. Be certain to label wires prior to replacing connectors, to assure proper location in new connectors.
PARTS INFORMATION
P/N Description Qty
12167122 Connector 1
12125675 Connector 1
12045773 Terminal (Package of 10) 1
Parts are currently available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor
Operation Description Labor Time
N6360 I/P Wiring Use Published
and/or Connector - Labor Operation
Repair. Time
N6270 Engine Wiring Use Published
and/or Connector - Labor Operation
Repair Time.
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.