What it means
A fault was detected in the transmission range control A circuit. The code alone does not establish that the vehicle uses a shift-by-wire actuator or that the circuit operates a manual valve.
At a glance
- Usually lights the check-engine light
How it works
The transmission control module monitors the electrical path identified as transmission range control A for an open circuit. P07E8 sets when that circuit appears electrically interrupted, so the module may not receive or deliver the expected range-control signal; the code does not establish a particular actuator design.
Common causes
Most likely first.
- Open wire to the range actuator
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Record freeze-frame data and range-control A status before clearing the code, then check whether the reported range agrees with the selector.
- Inspect the range-control A harness and connectors for a broken wire, corrosion, a loose terminal, or a pin pushed back into the connector.
- With the circuit de-energized as directed by the manufacturer's procedure, check continuity through the range-control A wiring to locate an open.
- Check connector terminal fit and inspect accessible module or sensor connections for a cracked joint or poor contact.
- If wiring continuity and connections are sound, test the named circuit and connected components using the manufacturer's diagnostic procedure before condemning a module.
Common fixes
- Reseat a backed-out terminal and secure the connector.
- Repair an open or broken range-control A wire.
- Clean corroded terminals and restore a sound connection.
- Repair a confirmed cracked solder joint or replace the failed component after circuit testing.
Can I keep driving?
Drive only if the selected range is clear and the transmission shifts predictably; avoid unnecessary trips if it enters limp mode or misses shifts. An open range-control A circuit can leave the transmission with incorrect or limited range information.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.