Rick's Free Auto Repair Advice

GM transmission problems

GM Transmission sets trouble codes

GM has issued a service bulletin #02-07-30-022B to address GM transmission problems where the transmission sets trouble codes as shown below. The bulletin applies to the vehicles listed below. The transmissions in these vehicles may set any or all of these trouble codes

P0716 Input/Turbine Speed Sensor Circuit Range/Performance
P0717 Input/Turbine Speed Sensor Circuit No Signal
P0730 Incorrect Gear Ratio
P0753 Shift Solenoid A Electrical
P0758 Shift Solenoid B Electrical
P1860 Torque Converter Clutch Pulse Width Modulation Solenoid Valve Circuit
P1887 Transmission Fluid Pressure Manual Valve Position Switch Circuit

The GM transmission problems and affected vehicles are:

2000-04 Buick Century, LeSabre, Park Avenue, Regal
2000-04 Buick Rendezvous
2000-01 Chevrolet Lumina
2000-04 Chevrolet Cavalier, Impala, Malibu, Monte Carlo, Venture
2004 Chevrolet Classic
2000-02 Oldsmobile Intrigue
2000-03 Oldsmobile Aurora
2000-04 Oldsmobile Alero, Silhouette
2000-04 Pontiac Bonneville, Grand Am, Grand Prix, Montana, Sunfire
2000-04 Pontiac Aztek
2000-04 Toyota Cavalier

All of the above vehicles with the 4T65E, 4T40-E, or 4T45-E automatic transmission

In addition to the Service Engine Soon light, you may also notice that the transmission has harsh shifts

GM has determined that the cause of these issues may be an intermittent connection at the transaxle 20-way connector to the wiring harness interface. The bulletin advises you to thoroughly inspect the wiring harness at the transmission near the 20-way connector for these conditions:

The wiring harness may be stretched too tightly or other components may be pressing on the connector body causing downward pressure that causes intermittent contact

The terminals may not be fully seated in the cavity of the connector

The male terminals in the transmission portion of the connector may be bent

The female terminals may be loose or not making proper contact.

The wire crimp many not be good

The connector is not properly seated or locked in place.


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Posted on by Rick Muscoplat

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