P2068 — Fuel Level Sensor "B" Circuit High

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2068 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
Subsystem check With the fuel level sensor "B" disconnected, measure signal voltage at the harness connector: a high reading with the component unplugged indicates a short to power in the harness; if it drops to normal, the component itself is faulty.
Subsystem check Measure fuel pressure at the rail and compare with factory specification at idle and under load.
Subsystem check Check short-term and long-term fuel trims in live data to see which way the mixture is off.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2068 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2068 (parts and labor, USD, independent shop rates): Replace the fuel filter: $80–$200; Replace the pressure regulator or sensor: $150–$450; Replace the fuel pump: $400–$900; Clean or replace injectors: $200–$800. Overall, fixing P2068 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What are the symptoms of P2068?

Drivers most often notice: loss of power under load, hard starting or long cranking, fuel smell in severe cases, rough idle and hesitation.

Will P2068 clear itself?

Sometimes P2068 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code P2068 mean?

Fuel Level Sensor "B" Circuit High (P2068): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors, contaminated or incorrect fuel.

What is the most common cause of P2068?

The most common causes are: vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors, contaminated or incorrect fuel.

How do I diagnose P2068 myself?

Start with a scan: confirm P2068, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the fuel level sensor "B", and verify the suspect component against live data before buying parts.

What does P2068 mean?

P2068 is logged by the onboard diagnostics when the fuel delivery and mixture control does not behave as expected. The official definition is “Fuel Level Sensor "B" Circuit High”. This is a powertrain (engine/transmission) category code.

“Circuit high” means the control module sees a voltage on the fuel level sensor "B" circuit that is above the expected range — typically close to battery voltage. Physically this points to a short to a power feed, a broken ground return, or a failed component pulling the signal line high.

To set P2068, the control module compares live readings of the fuel delivery and mixture control against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

What causes P2068?

open ground return of the fuel level sensor "B"
signal wire shorted to battery positive
failed fuel level sensor "B" pulling the signal high
faulty fuel rail pressure sensor or wiring
vacuum or intake leaks skewing the mixture
weak fuel pump or clogged fuel filter
clogged or leaking fuel injectors
faulty fuel pressure regulator

Common symptoms of P2068

loss of power under load
hard starting or long cranking
fuel smell in severe cases
rough idle and hesitation
Check Engine Light on
increased fuel consumption

How to diagnose P2068

Connect an OBD2 scanner, confirm P2068 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
With the fuel level sensor "B" disconnected, measure signal voltage at the harness connector: a high reading with the component unplugged indicates a short to power in the harness; if it drops to normal, the component itself is faulty.
Measure fuel pressure at the rail and compare with factory specification at idle and under load.
Check short-term and long-term fuel trims in live data to see which way the mixture is off.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2068 does not return.

How to fix P2068

Start with the cheapest and most common causes before replacing expensive parts:

Replace the fuel filter — $80–$200
Replace the pressure regulator or sensor — $150–$450
Replace the fuel pump — $400–$900
Clean or replace injectors — $200–$800

How much does it cost to fix P2068?

Repair cost depends on which component actually failed. Typical scenarios for P2068 (parts and labor, USD, independent shop rates):

Replace the fuel filter: $80–$200
Replace the pressure regulator or sensor: $150–$450
Replace the fuel pump: $400–$900
Clean or replace injectors: $200–$800

Overall, fixing P2068 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2068?

Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.