Powertrain, generic (extended)

P26F0 Starter Relay A Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P26F0 says that starter relay A remains closed even though the module has withdrawn its command, so current keeps flowing to the starter or its solenoid. Unlike the circuit codes P0615 to P0617, the wiring may be intact; the problem lies in the switching itself, typically welded contacts or a sticking armature. Detection works by feedback, for instance a crank sense signal that should vanish once the relay is released. No manufacturer documents P26F0 publicly. Jeep bulletins show that FCA drives some starters through two separately monitored relays, Starter Control 1 and 2, and GM runs extensive driver checks on its starter relay A, which are the closest references. Left unattended, a relay stuck on can overheat the starter and wear pinion and ring gear.

Likely causes

Welded or sticking contacts in starter relay A
Relay A control circuit fed from elsewhere so the coil stays energised
Faulty crank feedback signal suggesting a closed relay

Symptoms

  • Starter keeps running or grinding after the engine has started
  • Check engine light, stop-start disabled
  • Burning smell or flat battery after short trips

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–700
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

starter relay astarter motor

Related codes

P26F1P26F2P0615P0617

References: law.cornell.edu, static.nhtsa.gov, gsi.ext.gm.com.