In order to allow you to manually downshift the transmission using the gear shift or paddle shifters, the downshift switch needs to send your request to the ECU so it can actuate the right shift solenoid. If this signal coming from the downshift switch circuit is having intermittent issues, a P2782 DTC will be saved.
How Serious is the Code?
Although you won’t be able to manually downshift your transmission using the shifter or paddle shifters behind the steering wheel, a P2782 diagnostic trouble code isn’t likely to affect the performance of your vehicle.
Symptoms of a P2782 include:
- Gear changes via paddle shifters/manual shift gate will not work
- Broken downshift switch
- Wiring issue
- Shifter assembly failure
- ECU programming issue
How to Diagnose the Code?
The first step that a mechanic should take when trying to diagnose a P2782 OBDII trouble code, is to check the condition of the wiring and connectors going to the shifter assembly. Next, they’ll need to check the manufacturer’s TSB database to see if there are any known causes and solutions for this problem. After that, the downshift switch and possibly the shifter assembly should be tested.
What Repairs Will Fix P2782?
- Replace downshift switch
- Repair wiring/connectors
- Repair/replace shifter assembly
- Reflash/update ECU programming