Damaged, chafed or broken wiring in the range control circuit, including open circuit or poor ground; Corroded, loose or water-damaged connector at the transmission, range actuator or control unit; Faulty range selection actuator, motor or solenoid with an open winding; Low battery voltage or poor power or ground supply to the transmission control unit; Blown fuse or faulty relay supplying the range control circuit; Internal fault in the transmission or powertrain control unit driver circuit.

P07E8

Transmission Range Control A Circuit/Open.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
E8: FaultThe specific fault in that area

What it means

P07E8 is the generic code for an open circuit in Transmission Range Control circuit 'A'. The transmission or powertrain control unit commands the electronic range selection system (the actuator or solenoid that engages Park, Reverse, Neutral and Drive) and saw no current or voltage where it expected it. That points to a break or very high resistance in the control circuit. Which actuator or output 'circuit A' refers to depends on the vehicle and transmission design.

Symptoms

Transmission warning light or malfunction message on the dash
Gear selector does not change range, or changes range slowly or erratically
Car will not engage Drive or Reverse, or will not go into Park
Transmission stuck in one gear or in limp mode
Engine may not start, or start only in certain selector positions
Gear indicator on the dash flickers or shows incorrect range

Possible causes

Damaged, chafed or broken wiring in the range control circuit, including open circuit or poor groundlikely
Corroded, loose or water-damaged connector at the transmission, range actuator or control unitlikely
Faulty range selection actuator, motor or solenoid with an open windingpossible
Low battery voltage or poor power or ground supply to the transmission control unitpossible
Blown fuse or faulty relay supplying the range control circuitpossible
Internal fault in the transmission or powertrain control unit driver circuitrare

How to diagnose

Read all stored and pending codes and the freeze frame data, and note any related range sensor, communication or low voltage codes
Check battery condition and charging voltage, as low voltage can cause range control faults
Inspect the range control wiring and connectors at the transmission, actuator and control unit for chafing, corrosion, moisture and bent pins
Check the relevant fuses and relays against the wiring diagram for your model
With the ignition off and the connector unplugged, test the circuit for continuity, short to ground and short to voltage using the manufacturer's wiring diagram
Check power and ground supplies at the actuator or solenoid connector with the ignition on
Measure the actuator or solenoid resistance and compare it with the specification for that transmission
Use a scan tool's bidirectional test, if supported, to command the range actuator and watch the response

How to fix

Repair or replace damaged wiring, and re-pin or replace faulty terminals
Clean or replace corroded or water-damaged connectors and seal them against moisture
Replace the range actuator, motor or solenoid if it is open circuit or out of specification
Restore a good battery, power and earth supply, and replace any failed fuse or relay after finding why it failed
Replace or repair the control unit only after wiring and actuator faults are ruled out, and have it programmed to the vehicle as required
Clear the code and road test to confirm it does not return

Can I keep driving?

High severity

Avoid driving if you can. A fault in range control can leave the car unable to select a gear or engage Park, which is a safety risk, so have it recovered or repaired before further use.

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