Powertrain, generic · Transmission

P07CD Transmission Mode Switch C Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Wire or connector to the button open
Button open internally
Signal wire shorted to positive

Symptoms

  • Mode C cannot be selected or stays active
  • Mode indicator missing or flashing
  • Transmission stays on the normal program

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–300
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission mode switchswitch wiringtransmission control module

Related codes

P078FP07CCP071CP05D2

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.