Chassis, generic

C0800 Device Power 1 Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Generic code lists omit C0800, but GM uses it widely for the supply voltage that a chassis module sees, often the brake control module. Saab workshop pages for the 2011 models list the subcodes are 03 below threshold, 07 above, 0D high resistance and 11 high input; the module flags a supply under roughly 9 V or over 18 V lasting about 5 s and may switch itself off. Saab's 2009 9-3 ESP unit sets 03 under 8 V for 0.5 s, or under 9.5 V above 15 km/h, and drops ABS and ESP. GM bulletins tie it to a loose negative cable on the 2011-15 Cruze (PI1398A), to faults reproducible under heavy electrical load (PIC6037) and to poor connections on 2014-17 trucks (PIT5405C); on the 2013 LaCrosse and Malibu wheel speed faults come first (PIC5837). It is not a drive system low voltage code.

Likely causes

Loose or corroded battery cable or ground connection (GM PI1398A)
Weak battery or charging system fault, also after jump start or charger use
High resistance in the module's supply or ground circuit

Symptoms

  • ABS, traction and stability warnings light up, sometimes only briefly
  • Radio or displays switch off and on, lights flicker
  • Heavier steering at low speed on vehicles with electric power steering

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–400
Time0.3–2.5 h

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

Parts involved

batterycharging systempower supply wiringbrake control module

Related codes

C0564C0565C0740P0560P0562P0563

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, static.nhtsa.gov.