Transmission mode switches select alternative shift programs such as sport, winter or tow/haul; the J2012 family runs from A (P071A–P071C) and B (P071D–P071F) to C (base code P078F), D and E. No manufacturer document available to us uses switches C to E; GM reads its analog mode switch under its own codes (low below 21–29 % of 5 V, high from 94 %, two trips) and newer drive mode selectors under P05D0–P05D3. P07CD means the signal of mode switch C is above its upper limit – an open circuit or a short to positive. The opposite is P07CC.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Mode C cannot be selected or stays active
- Mode indicator missing or flashing
- Transmission stays on the normal program
Most likely causes
- Wire or connector to the button open
- Button open internally
- Signal wire shorted to positive
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: easy
What each character of P07CD means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- CD: Specific fault in that system
Frequently asked questions
Can I keep driving with code P07CD?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P07CD?
The most common causes are: wire or connector to the button open; button open internally; signal wire shorted to positive.
Related codes
- P078FTransmission Mode Switch C Circuit
- P07CCTransmission Mode Switch C Circuit Low
- P071CTransmission Mode Switch A Circuit High
- P05D2Driver Mode Select Switch A Circuit High
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.