P0959: Auto Shift Manual Mode Circuit Intermittent OBD-II Trouble Code

In order to provide manual shifting capability, the auto stick shift switch/transmission shift switch connected to the shifter, sends an electrical signal vehicle’s computer to let it know what gear you would like to actuate. If there is an intermittent problem somewhere between this switch, the mode actuator or the wiring/connectors, a P0959 DTC will be saved.

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What Transmission Do I Have?

How Serious is the Code?

The most serious part of a P0959 diagnostic trouble code, is the fact that you will no longer be able to use the manual shifting function.

Symptoms

Symptoms of a P0959 include:

  • Manual shifting function is disabled

Causes

  • Damaged wiring and/or connectors
  • Failed Autostick transmission shift switch

How to Diagnose the Code?

In order to diagnose a P0959 OBDII trouble code, your mechanic should start by checking all of the wiring and connectors around the shifter for signs of damage and corrosion. They will also need to check the transmission shift switch sure that it works properly.

What Repairs Will Fix P0959?

  • Repair or replace damaged wiring and connectors
  • Replace Autostick transmission shift switch

Related Codes

N/A

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?