P26E6 code meaning
Starter Relay B Circuit High
Powertrain system Generic code P26xx codes Check engine light
What P26E6 means
P26E6 reports a short to positive on the control line of starter relay B. GM tests for it while its driver for the tandem starter pinion relay is off: if the line still shows 0.5 Ohm or less toward a power source for 40 out of 50 checks taken every 50 ms, with the engine stopped and at least 11 V available, the code is stored as type B. The danger of this fault is a relay that is energised without a command, so the pinion could be pushed into the ring gear. The diagnostic appears in GM's 2018 and 2023 tables with the same thresholds. P26E4 and P26E5 cover open and grounded circuits.
P26E6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P26E6
- Check engine light
- Stop-start disabled
- Starter noise or grinding without a start command
Common causes of P26E6
- Most likelyRelay B control wire shorted to a battery-powered wire, e.g. under the battery tray
- PossibleRelay B internally fed or contacts welded
- Less likelyEngine module driver output not switching off
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Starter relay bWiring harness
What each part of P26E6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| E6 | The exact fault in that area. |
What to do next
- Note P26E6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P26E6
What does P26E6 mean?
P26E6 means "Starter Relay B Circuit High". P26E6 reports a short to positive on the control line of starter relay B. It is a generic code, so it means the same on every make.
Is it safe to drive with P26E6?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P26E6 fail an emissions test?
Yes, it can. P26E6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P26E6 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P26E6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.