P26E5 code meaning
Starter Relay B Circuit Low
Powertrain system Generic code P26xx codes Check engine light
What P26E5 means
P26E5 indicates that the control circuit of starter relay B is shorted against ground. GM documents it for the tandem starter pinion relay of its 12 V stop-start engines: while the driver is switched on, an impedance of 0.5 Ohm or less toward ground in 8 of 10 samples of 50 ms sets the code, enabled at standstill once run/crank voltage is at least 6.41 V; the lamp follows as type B after two trips. The same entries appear in GM's 2019 tables for the 5.3 litre V8 and in 2023 tables. A GM preliminary information for 2019 to 2021 Silverado and Sierra 1500 with the 2.7 litre engine lists P26E5 among many codes caused by a shorting engine harness and blown fuses. Open and high-voltage faults are P26E4 and P26E6.
P26E5 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P26E5
- Check engine light
- No crank or no restart after an automatic engine stop
- Blown fuses and further unrelated codes if a harness short is the cause
Common causes of P26E5
- Most likelyEngine harness chafed so the relay B control wire touches ground
- PossibleShorted coil in relay B or the pinion solenoid
- Less likelyDamaged high-side driver in the engine module
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 P26E5 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. |
| E5 | The exact fault in that area. |
What to do next
- Note P26E5 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 P26E5
What does P26E5 mean?
P26E5 means "Starter Relay B Circuit Low". P26E5 indicates that the control circuit of starter relay B is shorted against ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P26E5?
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 P26E5 fail an emissions test?
Yes, it can. P26E5 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 P26E5 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P26E5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.