Powertrain, generic · Computer and auxiliary outputs

P0617 Starter Relay A Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

The engine module switches the starter relay coil through its own driver – GM petrol engines with 12 V stop-start use a low-side driver, the Saab 9-4X switches 12 V to the coil. CARB requires output components to be checked for open and short circuits. GM sets the codes after two trips on stop-start engines, while GM diesels (2016) and the Saab 9-4X store them without the check engine light. At Ford an active starter code blocks stop-start. P0617 means the control wire is shorted to battery voltage: GM detects it with the driver on, when the voltage stays high although the driver pulls to ground (40 of 50 samples in 2018 and 2025, 8 of 10 in 2019). With a high-side circuit such as the Saab's, the short can close the relay permanently and keep the starter turning – a risk for starter and ring gear; with a low-side circuit the relay loses its control.

Likely causes

Control wire shorted to a battery feed (harness damage)
Relay faulty internally (contact to coil, welded)
Voltage fed in by retrofitted electrics (remote start, alarm)
Driver in the engine module faulty

Symptoms

  • Engine does not crank, or the starter keeps running
  • Stop-start not working
  • Battery drained
  • Check engine light only with some makers

Repair estimate

DifficultyEasyDIY possible
Parts and labour€15–400
Time0.3–2.5 h

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

Parts involved

starter relaystarter relay control circuitengine control module

Related codes

P0615P0616P26E6P26F0

References: law.cornell.edu, gsi.ext.gm.com, saabwisonline.com.