What it means
The control module monitors whether starter relay B switches off when commanded. It sets this code when the relay remains electrically on after an off command.
At a glance
- Usually lights the check-engine light
How it works
Starter relay B switches power to a second starter-related circuit when the module requests it. The module monitors whether relay B turns off after the command and sets P26F2 when it detects that relay B remains electrically on.
Common causes
Most likely first.
- Starter relay contacts stuck closed
- Relay control circuit fault
Symptoms
- Starter may continue engaging after the engine starts
- Unusual starter noise
- A starter or powertrain warning light may appear
How to diagnose it
- Use freeze-frame data and scan-tool commands to confirm whether relay B was expected to be off when P26F2 set.
- With the ignition off and vehicle secured, inspect relay B and its socket for heat damage, corrosion, or poor seating.
- Check whether the starter continues to engage after the engine starts, and avoid further starting attempts if it does.
- Test relay B contacts and control wiring for a contact stuck closed or a circuit holding the relay on, following the manufacturer's procedure.
- If the relay and wiring pass, check the module's relay B command and feedback circuit.
Common fixes
- Reseat relay B and clean or repair loose or corroded socket terminals.
- Replace starter relay B if its contacts stay closed when de-energized.
- Repair a relay B control wire that is keeping it energized.
- Repair a confirmed fault in the relay B command or feedback wiring.
Can I keep driving?
If the starter continues engaging after the engine starts, stop the engine and do not drive; a powered starter can overheat and be damaged. If that symptom is absent, arrange prompt diagnosis and limit unnecessary restarts.
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.