Damaged wiring to the mode switch C circuit chafed or shorted to ground; Faulty or sticking transmission mode switch; Corroded, loose or water-contaminated connector at the switch or control module; Moisture or debris inside the gear selector or console switch assembly; Faulty reference or supply voltage to the switch circuit from the control module; Internal fault in the transmission control module.

P07CC

Transmission Mode Switch C Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
CC: FaultThe specific fault in that area

What it means

P07CC means the transmission control module has detected a low voltage signal in the circuit for Transmission Mode Switch C. The module saw a voltage or signal state below the expected range, which suggests a short to ground, a wiring fault or a faulty switch. How this switch is used (for example drive mode, sport, tow or winter mode selection) varies by vehicle.

Symptoms

Gearbox warning light or malfunction indicator lamp on
Selected drive mode (sport, economy, tow or winter) not responding or not changing
Gearbox stuck in a default mode or limp mode
Harsh, delayed or unusual gear changes
Mode indicator on the dash flickering, missing or showing the wrong mode

Possible causes

Damaged wiring to the mode switch C circuit chafed or shorted to groundlikely
Faulty or sticking transmission mode switchlikely
Corroded, loose or water-contaminated connector at the switch or control modulelikely
Moisture or debris inside the gear selector or console switch assemblypossible
Faulty reference or supply voltage to the switch circuit from the control modulepossible
Internal fault in the transmission control modulerare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting whether other transmission or switch codes are present
Check for any manufacturer service bulletins or known issues for the specific model and gearbox
Visually inspect the mode switch, its connector and the wiring for damage, chafing, water ingress and corrosion
Use live data to watch the mode switch C status while operating the switch and see if it responds or stays fixed low
Check the switch circuit wiring for a short to ground and for continuity, using the wiring diagram for the vehicle
Measure the supply or reference voltage at the switch connector and check the ground
Test the switch itself for correct resistance or switching action against the manufacturer specification
If the wiring and switch are sound, check the control module connectors and power and earth feeds before considering the module

How to fix

Repair or replace damaged wiring that is shorted to ground
Clean or replace corroded or damaged connectors and terminals
Replace the faulty mode switch or the selector assembly that contains it
Dry out and clean the switch assembly if moisture is the cause, and fix the source of leakage
Restore correct supply voltage by repairing the related circuit fault
Replace or repair the transmission control module only after all other causes are ruled out, then clear the code and road test

Can I keep driving?

Medium severity

The car can usually be driven carefully for a short time, but it may be stuck in a default mode or limp mode with reduced performance. Get it checked soon, particularly if gear changes are harsh or erratic.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.