P26E4Starter Relay B Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Stop-start systems often use a second starter relay, and P26E4 is the general circuit fault of this relay B. On GM's 12 V stop-start engines it switches the pinion of a tandem starter: the module's high-side driver flags an open circuit when, at standstill with at least 11 V, more than 200 kOhm appear toward ground in 40 of 50 samples (50 ms each); type B, so the lamp lights after two trips. FCA engines name it Starter Control 2. Jeep Compass bulletins 2019 to 2023 pair P26E4 with P0615 as a plausibility fault and failed restarts from stop-start, solved by new PCM or BCM software, and an Alfa Romeo Stelvio TCM update lists it as Starter Relay B Circuit. Low and high faults have separate codes, P26E5 and P26E6.
- What you may notice
- Check engine light
- Engine does not restart from an automatic stop
- Stop-start function disabled, occasional no-crank
- Likely causes
- PossibleOpen wire or loose terminal between module and relay B or pinion solenoid
- PossibleControl module software misjudging the circuit, update available on some FCA models
- PossibleOpen coil in relay B or in the tandem starter pinion solenoid
- RareFaulty 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.