C0800 code meaning
Device Power 1 Circuit
What C0800 means
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.
C0800 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0800
- 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
Common causes of C0800
- Most likelyLoose or corroded battery cable or ground connection (GM PI1398A)
- PossibleWeak battery or charging system fault, also after jump start or charger use
- PossibleHigh resistance in the module's supply or ground circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
BatteryCharging systemPower supply wiringBrake control module
What each part of C0800 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 00 | The exact fault in that area. |
What to do next
- Note C0800 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0800
What does C0800 mean?
C0800 means "Device Power 1 Circuit". Generic code lists omit C0800, but GM uses it widely for the supply voltage that a chassis module sees, often the brake control module. It is a generic code, so it means the same on every make.
Is it safe to drive with C0800?
Drive gently and only to a workshop. With C0800 the car can go into limp mode (reduced power) to protect itself.
Will C0800 fail an emissions test?
C0800 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0800 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0800 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.