P07D6: Transmission Mode Switch F Circuit High

Transmission mode switches select alternative shift programs such as sport, winter, eco or tow/haul; J2012 numbers them A to F without saying which button is which. Switch F is the sixth and last of the family after A (P071A–P071C), B (P071D–P071F), C (P078F, P07CC, P07CD), D (P07CE–P07D0) and E (P07D1–P07D3). No manufacturer document available to us uses switches C to F; GM reads its analog drive mode switch under its own codes (low below 21–29 % of 5 V, high from 94 %, two trips), newer selectors under P05D0–P05D3. P07D6 means the signal of switch F is above its upper limit – an open circuit at the pulled-up input or a short to positive. The opposite is P07D5.

Symptoms

• Mode F program cannot be selected or stays active
• Mode indicator missing or wrong
• Transmission stays on the normal program

Most likely causes

• Wire or connector to the switch open
• Switch open internally
• Signal wire shorted to positive

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the fluid level and condition
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Read the input and output speed in live data
4. Check the connector and wiring
5. Check for other related engine codes
6. Consult the manufacturer's procedure for the transmission

Good to know

• Repair difficulty: easy

What each character of P07D6 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 7: Transmission
• D6: Specific fault in that system

Frequently asked questions

Can I keep driving with code P07D6?

Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.

What causes code P07D6?

The most common causes are: wire or connector to the switch open; switch open internally; signal wire shorted to positive.

Related codes

• P07D4Transmission Mode Switch F Circuit
• P07D5Transmission Mode Switch F Circuit Low
• P07D3Transmission Mode Switch E Circuit High
• P07CDTransmission Mode Switch C Circuit High
• P071CTransmission Mode Switch A Circuit High

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 18OBDG03A Engine Diagnostics

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.