P0698 code meaning
Sensor Reference Voltage C Circuit Low
Powertrain system Generic code P06xx codes Check engine light
What P0698 means
The engine module feeds sensors from several regulated 5 V reference circuits; a short at one sensor pulls the whole circuit down, so all its sensors report at once – unplug them one by one to find the culprit. Which sensors hang on circuit C depends on the maker – pedal sensor 2 is common to all: GM 2016–2025 feeds only pedal sensor 2 from it, the Saab 9-4X also the MAP sensor, the Saab 9-5 2.0 L turbo also throttle, crankshaft and A/C pressure sensors, and Bentley's 2026 Bentayga V8 lists its own set. P0698 means reference C is too low – usually a short to ground. GM's 6.6 L Duramax LB7/LLY sets it below 4.7 V for 2 s, GM Europe's 2.0 L turbo after 1 s or 10 s cumulative, each with the lamp in the first trip; newer GM engines report it as P0697.
P0698 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0698
- Check engine light
- Several sensor codes at once (pedal, throttle, pressure)
- Electronic throttle limp mode, reduced power
- Possibly starting problems
Common causes of P0698
- Most likelyShort in the wire or sensor of a connected sensor
- PossibleChafing or water in harness or connector
- PossibleA connected sensor faulty internally
- Less likelyModule internal voltage regulator
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Sensor reference voltage circuitSensor wiringEngine control module
What each part of P0698 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 98 | The exact fault in that area. |
What to do next
- Note P0698 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 P0698
What does P0698 mean?
P0698 means "Sensor Reference Voltage C Circuit Low". The engine module feeds sensors from several regulated 5 V reference circuits; a short at one sensor pulls the whole circuit down, so all its sensors report at once – unplug them one by one to find the culprit. It is a generic code, so it means the same on every make.
Is it safe to drive with P0698?
Drive gently and only to a workshop. With P0698 the car can go into limp mode (reduced power) to protect itself.
Will P0698 fail an emissions test?
Yes, it can. P0698 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0698 to fix?
Difficulty: medium. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P0698 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.