P26E6: Starter Relay B Circuit High

What it means

Voltage on the secondary starter relay control line is above the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.

At a glance

• Usually lights the check-engine light

How it works

Starter relay B switches a secondary starter circuit, and the control module monitors voltage on the relay’s control line. This high-circuit code sets when line voltage exceeds the expected range, which can happen if the wire contacts battery voltage or the relay coil is open.

Common causes

Most likely first.

1. Control wire shorted to B+
2. Open relay coil
3. Connector pins corroded - high contact resistance

Symptoms

• Starter may continue engaging after the engine starts
• Unusual starter noise
• A starter or powertrain warning light may appear

How to diagnose it

1. Use a scan tool to save freeze-frame data and check related starter codes before clearing the fault.
2. If the starter remains engaged or makes unusual noise after the engine starts, switch off the engine as soon as it is safe.
3. Inspect relay B, its socket, and the control harness for a wire shorted to battery voltage, corrosion, or damaged terminals.
4. Check the relay coil and control line for an open circuit using the wiring diagram and manufacturer's test procedure.
5. If the relay and wiring pass, test the module output and commanded state at the specified test points.

Common fixes

• Repair wiring that is shorted to battery voltage.
• Repair an open wire or poor connection in the relay B control circuit.
• Replace relay B if its coil is open or it fails the specified test.
• Repair the control module circuit if testing confirms its output is stuck high.

Can I keep driving?

Do not continue driving if the starter stays engaged or makes grinding noise; it can damage the starter and engine flywheel. Stop safely and arrange prompt repair.