P26E5Starter Relay B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyEngine harness chafed so the relay B control wire touches ground
- PossibleShorted coil in relay B or the pinion solenoid
- RareDamaged high-side driver in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.